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• MySQL Extremely High Disk Activity (Read Operations)

  - by Jake Schoermer

  I have 1GB Linode VPS with a standard LAMP stack. Apache is tuned fine but for some reason MySQL's disk usage is high. This is causing really slow site load times. RAM and CPU usage are fine. Can anyone give me any pointers on tuning mysql's disk performance? I'm using InnoDB. iotop output is below. Total DISK READ: 38.50 M/s | Total DISK WRITE: 27.20 K/s TID PRIO USER DISK READ> DISK WRITE SWAPIN IO COMMAND 9808 be/4 mysql 22.40 M/s 0.00 B/s 0.00 % 63.75 % mysqld 10045 be/4 mysql 2.06 M/s 0.00 B/s 0.00 % 26.65 % mysqld 9987 be/4 mysql 1694.38 K/s 0.00 B/s 0.00 % 18.33 % mysqld 10015 be/4 mysql 1554.47 K/s 0.00 B/s 0.00 % 12.71 % mysqld 10019 be/4 mysql 1461.21 K/s 0.00 B/s 0.00 % 5.58 % mysqld 9839 be/4 mysql 1383.48 K/s 0.00 B/s 0.00 % 25.69 % mysqld 10031 be/4 mysql 1243.58 K/s 0.00 B/s 0.00 % 5.68 % mysqld 10023 be/4 mysql 1057.04 K/s 0.00 B/s 0.00 % 2.02 % mysqld 10020 be/4 mysql 1025.95 K/s 0.00 B/s 0.00 % 7.05 % mysqld 10001 be/4 mysql 808.33 K/s 683.97 K/s 0.00 % 1.16 % mysqld 10025 be/4 mysql 746.15 K/s 0.00 B/s 0.00 % 3.28 % mysqld 10043 be/4 mysql 715.06 K/s 0.00 B/s 0.00 % 0.48 % mysqld 10044 be/4 mysql 672.31 K/s 0.00 B/s 0.00 % 5.25 % mysqld 10034 be/4 mysql 668.42 K/s 1989.73 K/s 0.00 % 5.31 % mysqld 9985 be/4 mysql 450.80 K/s 124.36 K/s 0.00 % 8.83 % mysqld 9989 be/4 mysql 357.53 K/s 0.00 B/s 0.00 % 5.21 % mysqld 10033 be/4 mysql 186.54 K/s 0.00 B/s 0.00 % 1.59 % mysqld 10021 be/4 mysql 155.45 K/s 435.25 K/s 0.00 % 1.23 % mysqld 10007 be/4 mysql 124.36 K/s 0.00 B/s 0.00 % 0.53 % mysqld 9763 be/4 www-data 38.86 K/s 0.00 B/s 0.00 % 4.56 % apache2 -k start 10027 be/4 mysql 31.09 K/s 0.00 B/s 0.00 % 4.24 % mysqld 1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init 2 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthreadd] 3 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0] 4 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/0:0] 5 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kworker/u:0] 6 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/0] 7 rt/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [migration/1]

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• Setting up SSL on apache on linux ubuntu

  - by ThomasReggi

  I'm trying to get SSL to run on my apache web server. I do not have the DNS for the domain setup yet is that an issue? How do I setup SSL on my web server? When I start apache it fails. root@vannevar:/etc/apache2/ssl# service apache2 start * Starting web server apache2 Action 'start' failed. The Apache error log may have more information. The log stats that it's unable to read the certificate. [Thu Jun 28 15:01:02 2012] [error] Init: Unable to read server certificate from file /etc/apache2/ssl/www.example.com.csr [Thu Jun 28 15:01:02 2012] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag [Thu Jun 28 15:01:02 2012] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error The contents of /etc/apache2/httpd.conf ServerName [SERVERIP] The contents of /etc/apache2/ports.conf # If you just change the port or add more ports here, you will likely also # have to change the VirtualHost statement in # /etc/apache2/sites-enabled/000-default # This is also true if you have upgraded from before 2.2.9-3 (i.e. from # Debian etch). See /usr/share/doc/apache2.2-common/NEWS.Debian.gz and # README.Debian.gz NameVirtualHost [SERVERIP]:443 NameVirtualHost *:80 Listen 80 <IfModule mod_ssl.c> # If you add NameVirtualHost *:443 here, you will also have to change # the VirtualHost statement in /etc/apache2/sites-available/default-ssl # to <VirtualHost *:443> # Server Name Indication for SSL named virtual hosts is currently not # supported by MSIE on Windows XP. Listen 443 </IfModule> <IfModule mod_gnutls.c> Listen 443 </IfModule> The contents of /etc/apache2/sites-available/www.example.com <VirtualHost *:80> ServerAdmin [email protected] ServerName example.com ServerAlias www.example.com DocumentRoot /srv/sites/example.com/public/ ErrorLog /srv/sites/example.com/logs/error.log CustomLog /srv/sites/example.com/logs/access.log combined </VirtualHost> <VirtualHost [SERVERIP]:443> SSLEngine On SSLCertificateFile /etc/apache2/ssl/www.example.com.csr SSLCertificateKeyFile /etc/apache2/ssl/www.example.com.key SSLCACertificateFile /etc/apache2/ssl/comodo.crt ServerAdmin [email protected] ServerName example.com ServerAlias www.example.com DocumentRoot /srv/sites/example.com/public/ ErrorLog /srv/sites/example.com/logs/error.log CustomLog /srv/sites/example.com/logs/access.log combined </VirtualHost>

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• HIGH CPU USAGE + low memory usage

  - by hadi

  as you can see in below , there are high cpu usage by httpd request. please help me to decrease them. thanks. 28577 apache 15 0 99676 53m 3488 S 21 0.2 1:13.67 httpd 28568 apache 15 0 99676 53m 3496 S 19 0.2 1:14.92 httpd 28608 apache 15 0 99676 53m 3428 R 19 0.2 0:28.28 httpd 28615 apache 15 0 99676 53m 3436 R 19 0.2 0:25.33 httpd 28616 apache 15 0 99676 53m 3440 S 19 0.2 0:25.83 httpd 28619 apache 15 0 99676 53m 3436 R 19 0.2 0:26.12 httpd 28635 apache 15 0 97.9m 54m 3416 S 19 0.2 0:24.86 httpd 28558 apache 15 0 97.9m 54m 3432 R 17 0.2 1:40.75 httpd 28560 apache 15 0 97.9m 54m 3496 R 17 0.2 1:40.02 httpd 28621 apache 15 0 97.9m 54m 3420 S 17 0.2 0:25.61 httpd 28641 apache 16 0 97.9m 54m 3428 R 17 0.2 0:21.52 httpd 28642 apache 15 0 99756 53m 3424 R 15 0.2 0:21.46 httpd 28643 apache 15 0 99676 53m 3424 S 15 0.2 0:21.59 httpd 28594 apache 15 0 99756 53m 3428 R 13 0.2 0:44.41 httpd 28618 apache 15 0 99676 53m 3420 S 13 0.2 0:26.15 httpd 28654 apache 15 0 99676 53m 3472 S 13 0.2 0:04.27 httpd 28575 apache 15 0 99756 53m 3436 R 11 0.2 1:14.02 httpd 28576 apache 15 0 99676 53m 3496 S 11 0.2 1:16.79 httpd 28634 apache 15 0 99676 53m 3436 S 11 0.2 0:25.36 httpd 28653 apache 15 0 99676 53m 3424 S 11 0.2 0:04.35 httpd 28574 apache 15 0 99676 53m 3440 S 10 0.2 1:13.05 httpd 28592 apache 15 0 99676 53m 3492 R 10 0.2 0:45.78 httpd 28595 apache 15 0 99676 53m 3432 R 10 0.2 0:47.02 httpd 28617 apache 16 0 99676 53m 3436 S 10 0.2 0:25.32 httpd 28620 apache 15 0 99676 53m 3432 S 10 0.2 0:25.35 httpd 28597 apache 15 0 99676 53m 3428 S 8 0.2 0:43.56 httpd 11345 mysql 15 0 2927m 198m 4472 R 4 0.6 1624:43 mysqld 1 root 15 0 2036 648 552 S 0 0.0 0:16.97 init 2 root RT 0 0 0 0 S 0 0.0 0:48.50 migration/0 3 root 34 19 0 0 0 S 0 0.0 0:26.72 ksoftirqd/0 4 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0 5 root RT 0 0 0 0 S 0 0.0 0:04.98 migration/1 6 root 34 19 0 0 0 R 0 0.0 0:27.51 ksoftirqd/1 7 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/1 8 root RT 0 0 0 0 S 0 0.0 0:15.42 migration/2 9 root 34 19 0 0 0 S 0 0.0 0:26.50 ksoftirqd/2 10 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/2

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• Apache and MySQL taking all the memory? Maximum connections?

  - by lpfavreau

  I've a had one of our servers going down (network wise) but keeping its uptime (so looks the server is not losing its power) recently. I've asked my hosting company to investigate and I've been told, after investigation, that Apache and MySQL were at all time using 80% of the memory and peaking at 95% and that I might be needing to add some more RAM to the server. One of their justifications to adding more RAM was that I was using the default max connections setting (125 for MySQL and 150 for Apache) and that for handling those 150 simultaneous connections, I would need at least 3Gb of memory instead of the 1Gb I have at the moment. Now, I understand that tweaking the max connections might be better than me leaving the default setting although I didn't feel it was a concern at the moment, having had servers with the same configuration handle more traffic than the current 1 or 2 visitors before the lunch, telling myself I'd tweak it depending on the visits pattern later. I've also always known Apache was more memory hungry under default settings than its competitor such as nginx and lighttpd. Nonetheless, looking at the stats of my machine, I'm trying to see how my hosting company got those numbers. I'm getting: # free -m total used free shared buffers cached Mem: 1000 944 56 0 148 725 -/+ buffers/cache: 71 929 Swap: 1953 0 1953 Which I guess means that yes, the server is reserving around 95% of its memory at the moment but I also thought it meant that only 71 out of the 1000 total were really used by the applications at the moment looking a the buffers/cache row. Also I don't see any swapping: # vmstat 60 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 0 57612 151704 742596 0 0 1 1 3 11 0 0 100 0 0 0 0 57604 151704 742596 0 0 0 1 1 24 0 0 100 0 0 0 0 57604 151704 742596 0 0 0 2 1 18 0 0 100 0 0 0 0 57604 151704 742596 0 0 0 0 1 13 0 0 100 0 And finally, while requesting a page: top - 08:33:19 up 3 days, 13:11, 2 users, load average: 0.06, 0.02, 0.00 Tasks: 81 total, 1 running, 80 sleeping, 0 stopped, 0 zombie Cpu(s): 1.3%us, 0.3%sy, 0.0%ni, 98.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1024616k total, 976744k used, 47872k free, 151716k buffers Swap: 2000052k total, 0k used, 2000052k free, 742596k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 24914 www-data 20 0 26296 8640 3724 S 2 0.8 0:00.06 apache2 23785 mysql 20 0 125m 18m 5268 S 1 1.9 0:04.54 mysqld 24491 www-data 20 0 25828 7488 3180 S 1 0.7 0:00.02 apache2 1 root 20 0 2844 1688 544 S 0 0.2 0:01.30 init ... So, I'd like to know, experts of serverfault: Do I really need more RAM at the moment? How do they calculate that for 150 simultaneous connections I'd need 3Gb? Thanks for your help!

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• Tomcat can't talk to MySql after outage

  - by gav

  I missed a payment for my server and hey suspended my account for a day or so. When they brought the server back up all my data was in tact but for some reason Tomcat can't make a JDBC connection to my MySql server. They both run on the same machine and hence I have a bind address of 127.0.0.1. It's strange because I have reset the machine of my own accord before without issue but clearly something has been reset in the downtime. I followed this guide (Just the bits which don't concern S3, I am not on Amazon infrastructure) originally and everything worked as expected. I'm very new to being a SysAdmin and I'm not sure what to try, how would you go about diagnosing this issue? The stack trace I get is as follows; INFO: Deploying web application archive myapp-1.1.war 2010-05-26 22:07:22,221 [main] ERROR context.ContextLoader - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'messageSource': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager': Cannot resolve reference to bean 'sessionFactory' while setting bean property 'sessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory': Cannot resolve reference to bean 'hibernateProperties' while setting bean property 'hibernateProperties'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateProperties': Cannot resolve reference to bean 'dialectDetector' while setting bean property 'properties' with key [hibernate.dialect]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dialectDetector': Invocation of init method failed; nested exception is org.springframework.jdbc.support.MetaDataAccessException: Could not get Connection for extracting meta data; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.codehaus.groovy.grails.commons.spring.ReloadAwareAutowireCapableBeanFactory.doCreateBean(ReloadAwareAutowireCapableBeanFactory.java:129) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:714) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:404) at org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext.refresh(GrailsWebApplicationContext.java:153) ... I get this error for a number of 'beans'. If I type mysql at my command prompt then I can easily login with the same credentials as my grails app which uses GORM and Hibernate to persist objects to the DB. I might not have given enough info to start with but I'm really interested to learn and will certainly provide it if asked, I just really don't know where to start on this one. Thanks, Gav

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• 403 Forbidden Error when trying to view localhost on Apache

  - by misbehavens

  I think my Apache must be all screwed up. I don't know if it ever worked. I just upgraded to Snow Leopard, and the first step on this tutorial is to start apache and check that it's working by opening http://localhost. It starts fine but when I go to localhost I get a 403 forbidden error. I don't know where to start figuring out how to fix it, so I wonder if a fresh install of Apache would do the trick. What do you think? Update: I found some error logs in /private/var/log/apache2/. Found this in one of the logs. Not sure what it means: [Tue Nov 10 17:53:08 2009] [notice] caught SIGTERM, shutting down [Tue Nov 10 21:49:17 2009] [warn] Init: Session Cache is not configured [hint: SSLSessionCache] Warning: DocumentRoot [/usr/docs/dummy-host.example.com] does not exist Warning: DocumentRoot [/usr/docs/dummy-host2.example.com] does not exist httpd: Could not reliably determine the server's fully qualified domain name, using Andrews-Mac-Pro.local for ServerName mod_bonjour: Skipping user 'andrew' - cannot read index file '/Users/andrew/Sites/index.html'. [Tue Nov 10 21:49:19 2009] [notice] Digest: generating secret for digest authentication ... [Tue Nov 10 21:49:19 2009] [notice] Digest: done [Tue Nov 10 21:49:19 2009] [notice] Apache/2.2.11 (Unix) mod_ssl/2.2.11 OpenSSL/0.9.8k DAV/2 PHP/5.3.0 configured -- resuming normal operations Update: I also found something in the dummy-host.example.com-error_log file. I didn't set these dummy-host things by the way. Is this the default configuration? [Tue Nov 10 21:59:57 2009] [error] [client ::1] client denied by server configuration: /usr/docs Update: Woohoo! I found the file that had the virtual host definitions. It was in /etc/apache2/extra/httpd-vhosts.conf. It had those two dummy virtual host settings in there. I added a localhost virtual host. Not sure if this is necessary, but since it wasn't working before, decided to do it anyway. After removing the old virtual hosts, adding my new localhost virtual host, and restarting apache, it seems to work. So I guess whenever I want to add a virtual host, I only need to add them to this file? Or is there a hosts file somewhere, like there is on Linux? Update: Yes, there is an /etc/hosts file that need to be changed to. Add the virtual host name to that file.

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• How to make Horde connect to mysql with UTF-8 character set?

  - by jkj

  How to tell horde 3.3.11 to use UTF-8 for it's mysql connection? The $conf['sql']['charset'] only tells horde what is expected from the database. Horde uses MDB2 to connect to mysql. Is there way to force MDB2 or mysql character_set_client from php.ini? So far I found two workarounds: Force mysql to ignore character set requested by client [mysqld] skip-character-set-client-handshake=1 default-character-set=utf8 Force mysql to run SET NAMES utf8 on every connection [mysqld] init-connect='SET NAMES utf8' Both have drawbacks on multi user mysql server. The first disables converting character sets alltogether and the second one forces every connection to produce UTF-8. [EDIT] Found the problem. The 'charset' parameter was unset the last minute before sending to SQL backend. This is probably due to mysql not being able to digest utf-8 but utf8. Mysql specific mapping is required to make it work. I just worked around it by translating utf-8 - utf8. Won't work with any other databases with this patch though. --- lib/Horde/Share/sql.php.orig 2011-07-04 17:09:33.349334890 +0300 +++ lib/Horde/Share/sql.php 2011-07-04 17:11:06.238636462 +0300 @@ -753,7 +753,13 @@ /* Connect to the sql server using the supplied parameters. */ require_once 'MDB2.php'; $params = $this->_params; - unset($params['charset']); + + if ($params['charset'] == 'utf-8') { + $params['charset'] = 'utf8'; + } else { + unset($params['charset']); + } + $this->_write_db = &MDB2::factory($params); if (is_a($this->_write_db, 'PEAR_Error')) { Horde::fatal($this->_write_db, __FILE__, __LINE__); @@ -792,7 +798,13 @@ /* Check if we need to set up the read DB connection seperately. */ if (!empty($this->_params['splitread'])) { $params = array_merge($params, $this->_params['read']); - unset($params['charset']); + + if ($params['charset'] == 'utf-8') { + $params['charset'] = 'utf8'; + } else { + unset($params['charset']); + } + $this->_db = &MDB2::singleton($params); if (is_a($this->_db, 'PEAR_Error')) { Horde::fatal($this->_db, __FILE__, __LINE__);

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• "vagrant up" fails with "NS_ERROR_CALL_FAILED" error [on hold]

  - by TahitiPetey

  I am following the basic "Getting Started" guide: http://docs.vagrantup.com/v2/getting-started/index.html I ran vagrant init <etc> followed by vagrant up, but it fails with "NS_ERROR_CALL_FAILED" error. Then by enabling debug logging with VAGRANT_LOG=debug vagrant up, I get the following error output: ERROR vagrant: /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/plugins/providers/virtualbox/driver/base.rb:316:in `execute' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/plugins/providers/virtualbox/driver/version_4_2.rb:165:in `import' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/plugins/providers/virtualbox/action/import.rb:15:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/warden.rb:34:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/builtin/handle_box_url.rb:72:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/warden.rb:34:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/warden.rb:34:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/runner.rb:61:in `block in run' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/util/busy.rb:19:in `busy' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/runner.rb:61:in `run' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/builtin/call.rb:51:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/warden.rb:34:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/builtin/config_validate.rb:25:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/warden.rb:34:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/warden.rb:34:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/builder.rb:116:in `call' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/runner.rb:61:in `block in run' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/util/busy.rb:19:in `busy' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/action/runner.rb:61:in `run' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/machine.rb:147:in `action' /Applications/Vagrant/embedded/gems/gems/vagrant-1.2.2/lib/vagrant/batch_action.rb:63:in `block (2 levels) in run' INFO interface: error: There was an error while executing `VBoxManage`, a CLI used by Vagrant for controlling VirtualBox. The command and stderr is shown below. Command: ["import", "/Users/me/.vagrant.d/boxes/precise32/virtualbox/box.ovf"] Stderr: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% Interpreting /Users/me/.vagrant.d/boxes/precise32/virtualbox/box.ovf... OK. 0%... Progress object failure: NS_ERROR_CALL_FAILED My system setup info: Vagrant 1.2.2 VirtualBox 4.2.14 (Also tried 4.2.10, same error) Mac OSX 10.8.3

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• Disk IO causing high load on Xen/CentOS guest

  - by Peter Lindqvist

  I'm having serious issues with a xen based server, this is on the guest partition. It's a paravirtualized CentOS 5.5. The following numbers are taken from top while copying a large file over the network. If i copy the file another time the speed decreases in relation to load average. So the second time it's half the speed of the first time. It needs some time to cool off after this. Load average slowly decreases until it's once again usable. ls / takes about 30 seconds. top - 13:26:44 up 13 days, 21:44, 2 users, load average: 7.03, 5.08, 3.15 Tasks: 134 total, 2 running, 132 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.1%sy, 0.0%ni, 25.3%id, 74.5%wa, 0.0%hi, 0.0%si, 0.1%st Mem: 1048752k total, 1041460k used, 7292k free, 3116k buffers Swap: 2129912k total, 40k used, 2129872k free, 904740k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1506 root 10 -5 0 0 0 S 0.3 0.0 0:03.94 cifsd 1 root 15 0 2172 644 556 S 0.0 0.1 0:00.08 init Meanwhile the host is ~0.5 load avg and steady over time. ~50% wait Server hardware is dual xeon, 3gb ram, 170gb scsi 320 10k rpm, and shouldn't have any problems with copying files over the network. disk = [ "tap:aio:/vm/dev01.img,xvda,w" ] I also get these in the log INFO: task syslogd:1350 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syslogd D 00062E4F 2208 1350 1 1353 1312 (NOTLB) c0ef0ed0 00000286 6e71a411 00062e4f c0ef0f18 00000009 c0f20000 6e738bfd 00062e4f 0001e7ec c0f2010c c181a724 c1abd200 00000000 ffffffff c0ef0ecc c041a180 00000000 c0ef0ed8 c03d6a50 00000000 00000000 c03d6a00 00000000 Call Trace: [<c041a180>] __wake_up+0x2a/0x3d [<ee06a1ea>] log_wait_commit+0x80/0xc7 [jbd] [<c043128b>] autoremove_wake_function+0x0/0x2d [<ee065661>] journal_stop+0x195/0x1ba [jbd] [<c0490a32>] __writeback_single_inode+0x1a3/0x2af [<c04568ea>] do_writepages+0x2b/0x32 [<c045239b>] __filemap_fdatawrite_range+0x66/0x72 [<c04910ce>] sync_inode+0x19/0x24 [<ee09b007>] ext3_sync_file+0xaf/0xc4 [ext3] [<c047426f>] do_fsync+0x41/0x83 [<c04742ce>] __do_fsync+0x1d/0x2b [<c0405413>] syscall_call+0x7/0xb ======================= I have tried disabling irqbalanced as suggested here but it does not seem to make any difference.

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• Ubuntu Server 12.04 CPU Load

  - by zertux

  I have a Server (2x Hexa-Core Xeon E5649 2.53GHz w/HT with 32GB RAM and 20000 GB Bandwidth) running Ubuntu Server 12.04 LTS. The server runs LAMP and serves one website only, the estimated number of users is to be ~ 15,000 at the same time. At the moment i have around 2000 users online each of them runs 50 MySQL queries (small values mostly select and insert) from the beginning until the end of the session. Server CPU Load is high at this number of connections while the RAM usage is almost 1GB out of 32GB its worth mentioning that the server was running very fast with no problems at all but am concerned about the load average. http://s12.postimage.org/z7hi6mz3h/photo.png top - 03:02:43 up 9 min, 2 users, load average: 50.83, 30.14, 12.83 Tasks: 432 total, 1 running, 430 sleeping, 0 stopped, 1 zombie Cpu(s): 0.1%us, 0.2%sy, 0.0%ni, 66.5%id, 33.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 32939992k total, 3111604k used, 29828388k free, 84108k buffers Swap: 2048280k total, 0k used, 2048280k free, 1621640k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2860 root 20 0 25820 2288 1420 S 3 0.0 0:11.18 htop 1182 root 20 0 0 0 0 D 2 0.0 0:01.46 kjournald 1935 mysql 20 0 12.3g 161m 7924 S 1 0.5 102:31.45 mysqld 11 root 20 0 0 0 0 S 0 0.0 0:00.38 kworker/0:1 1822 www-data 20 0 247m 25m 4188 D 0 0.1 0:01.81 apache2 2920 www-data 20 0 0 0 0 Z 0 0.0 0:01.20 apache2 <defunct> 2942 www-data 20 0 247m 23m 3056 D 0 0.1 0:00.20 apache2 3516 www-data 20 0 247m 23m 3028 D 0 0.1 0:00.06 apache2 3521 www-data 20 0 247m 23m 3020 D 0 0.1 0:00.09 apache2 3664 www-data 20 0 247m 23m 3132 D 0 0.1 0:00.09 apache2 3674 www-data 20 0 247m 23m 3252 D 0 0.1 0:00.06 apache2 3713 www-data 20 0 247m 23m 3040 D 0 0.1 0:00.09 apache2 1 root 20 0 24328 2284 1344 S 0 0.0 0:03.09 init 2 root 20 0 0 0 0 S 0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0 0.0 0:00.01 ksoftirqd/0 6 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/0 7 root RT 0 0 0 0 S 0 0.0 0:00.00 watchdog/0 8 root RT 0 0 0 0 S 0 0.0 0:00.00 migration/1 9 root 20 0 0 0 0 S 0 0.0 0:00.00 kworker/1:0 root@server:~/codes# vmstat 1 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 19 0 0 29684012 86112 1689844 0 0 19 590 254 231 48 0 47 5 23 0 0 29704812 86128 1697672 0 0 4 320 11100 8121 77 1 22 0 33 0 0 29671044 86156 1705308 0 0 0 5440 13190 9140 95 1 4 0 33 3 0 29670088 86160 1706288 0 0 0 32932 12275 7297 99 0 1 0 35 0 0 29693456 86188 1710724 0 0 4 676 12701 7867 98 1 1 0 ^C I have not changed any of the default configurations that comes with Ubuntu. Is this load normal for such powerful server ? is there any optimization i can make to Apache/MySQL to minimize the load ? What do you recommend ?

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• How do I permanently delete e-mail messages in the sendmail queue and keep them from coming back?

  - by Steven Oxley

  I have a pretty annoying problem here. I have been testing an application and have created some test e-mails to bogus e-mail addresses (not to mention that my server isn't really set up to send e-mail anyway). Of course, sendmail is not able to send these messages and they have been getting stuck in the sendmail queue. I want to manually delete the messages that have been building up in the queue instead of waiting the 5 days that sendmail usually takes to stop retrying. I am using Ubuntu 10.04 and /var/spool/mqueue/ is the directory in which every how-to I have read says the e-mails that are queued up are kept. When I delete the files in this directory, sendmail stops trying to process the e-mails until what appears to be a cron script runs and re-populates this directory with the messages I don't want sent. Here are some lines from my syslog: Jun 2 17:35:19 sajo-laptop sm-mta[9367]: o530SlbK009365: to=, ctladdr= (33/33), delay=00:06:27, xdelay=00:06:22, mailer=esmtp, pri=120418, relay=e.mx.mail.yahoo.com. [67.195.168.230], dsn=4.0.0, stat=Deferred: Connection timed out with e.mx.mail.yahoo.com. Jun 2 17:35:48 sajo-laptop sm-mta[9149]: o4VHn3cw003597: to=, ctladdr= (33/33), delay=2+06:46:45, xdelay=00:34:12, mailer=esmtp, pri=3540649, relay=mx2.hotmail.com. [65.54.188.94], dsn=4.0.0, stat=Deferred: Connection timed out with mx2.hotmail.com. Jun 2 17:39:02 sajo-laptop CRON[9510]: (root) CMD ( [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -type f -cmin +$(/usr/lib/php5/maxlifetime) -print0 | xargs -n 200 -r -0 rm) Jun 2 17:39:43 sajo-laptop sm-mta[9372]: o52LHK4s007585: to=, ctladdr= (33/33), delay=03:22:18, xdelay=00:06:28, mailer=esmtp, pri=1470404, relay=c.mx.mail.yahoo.com. [206.190.54.127], dsn=4.0.0, stat=Deferred: Connection timed out with c.mx.mail.yahoo.com. Jun 2 17:39:50 sajo-laptop sm-mta[9149]: o51I8ieV004377: to=, ctladdr= (33/33), delay=1+06:31:06, xdelay=00:03:57, mailer=esmtp, pri=6601668, relay=alt4.gmail-smtp-in.l.google.com. [74.125.79.114], dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com. Jun 2 17:40:01 sajo-laptop CRON[9523]: (smmsp) CMD (test -x /etc/init.d/sendmail && /usr/share/sendmail/sendmail cron-msp) Does anyone know how I can get rid of these messages permanently? As a side note, I'd also like to know if there is a way to set up sendmail to "fake" sending e-mail. Is there?

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• Apache server completely freezes until it gets restarted

  - by nbv4

  My server does this every few days. What sucks is that it always seems to do this right after I go to bed, so when I wake up, I'm greeted with the fact that my server has been down for the past 6 or 7 hours. When I first noticed this, I added a cronjob that tries to restart the server every 15 minutes, but I guess that didn't fix it. Once I noticed the server was down, I can this command: /etc/init.d/apache2 restart * Restarting web server apache2 apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName ... waiting ...........................................................apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName httpd (pid 17597) already running ...which is odd, because a restart should restart the server, even if it's already running, correct? I eventually had to "stop" then "start" to get it working again. I then looked through the logs, and found something very weird. It seems that around the time the server crashed, the logs have entries that are wildly out of order. It looks a little like this: xx.xxx.xxx.x - - [21/Apr/2010:06:32:05 -0400] "GET / blah" xx.xxx.xxx.x - - [21/Apr/2010:06:51:25 -0400] "GET / blah" x.xx.xxx.xxx - - [21/Apr/2010:06:38:23 -0400] "GET / blah" xxx.xx.xx.xx - - [21/Apr/2010:06:31:56 -0400] "GET / blah" xxx.xx.xx.xx - - [21/Apr/2010:06:51:49 -0400] "GET / blah" xx.xx.xxx.xx - - [21/Apr/2010:06:33:20 -0400] "GET / blah" I don't think the problem is memory, because this: tells me that right before the crash, memory usage is fine. I'm running apache with the worker mpm, here are the settings for that: <IfModule mpm_worker_module> StartServers 1 MaxClients 100 MinSpareThreads 5 MaxSpareThreads 10 ThreadsPerChild 10 MaxRequestsPerChild 3000 </IfModule> This apache server is running a bunch of stuff, but most of the traffic comes from a django project I'm hosting, that uses mod_wsgi. There also is a simple machines forum that is running off of mod_fcgid. Those setting are below: <IfModule mod_fcgid.c> MaxRequestsPerProcess 500 MaxProcessCount 3 AddHandler fcgid-script .php .fcgi AddHandler cgi-script .cgi .pl FCGIWrapper "/usr/bin/php-cgi" .php </IfModule> Anyone know of anything else I can check? I've just about tweaked every single setting I can think of, yet these freezes still happen.

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• Anyone else experiencing high rates of Linux server crashes during a leap second day?

  - by Bron Gondwana

  POSTMORTEM Anticlimax: only thing that died was my VPN (openvpn) link to the cluster, so there was an exciting few seconds while it re-established. Everything else was fine. Starting back ntp everywhere. If you look at Marco's blog at http://my.opera.com/marcomarongiu/blog/2012/06/01/an-humble-attempt-to-work-around-the-leap-second - he has a solution for phasing the time change over 24 hours using ntpd -x to avoid the 1 second skip. Give that a go if it matters to you. For the systems I run, the jump isn't a problem. Just today, Sat June 30th - starting soon after the start of the day GMT. We've had a handful of blades in different datacentres as managed by different teams all go dark - not responding to pings, screen blank. They're all running Debian Squeeze - with everything from stock kernel to custom 3.2.21 builds. Most are Dell M610 blades, but I've also just lost a Dell R510 and other departments have lost machines from other vendors too. There was also an older IBM x3550 which crashed and which I thought might be unrelated, but now I'm wondering. The one crash which I did get a screen dump from said: [3161000.864001] BUG: spinlock lockup on CPU#1, ntpd/3358 [3161000.864001] lock: ffff88083fc0d740, .magic: dead4ead, .owner: imapd/24737, .owner_cpu: 0 Unfortunately the blades all supposedly had kdump configured, but they died so hard that kdump didn't trigger - and they had console blanking turned on. I've disabled console blanking now, so fingers crossed I'll have more information after the next crash. Just want to know if it's a common thread or "just us". It's really odd that they're different units in different datacentres bought at different times and run by different admins (I run the FastMail.FM ones)... and now even different vendor hardware. Most of the machines which crashed had been up for weeks/months and were running 3.1 or 3.2 series kernels. The most recent crash was a machine which had only been up about 6 hours running 3.2.21. THE WORKAROUND Ok people, here's how I worked around it. disabled ntp: /etc/init.d/ntp stop created http://linux.brong.fastmail.fm/2012-06-30/fixtime.pl (code stolen from Marco, see blog posts in comments) ran fixtime.pl without an argument to see that there was a leap second set ran fixtime.pl with an argument to remove the leap second NOTE: depends on adjtimex. I've put a copy of the squeeze adjtimex binary at http://linux.brong.fastmail.fm/2012-06-30/adjtimex - it will run without dependencies on a squeeze 64 bit system. If you put it in the same directory as fixtime.pl, it will be used if the system one isn't present. Obviously if you don't have squeeze 64 bit... find your own. I'm going to start ntp again tomorrow. As an anonymous user suggested - an alternative to running adjtimex is to just set the time yourself, which will presumably also clear the leapsecond counter.

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• resolve access violation exception (0xC0000005) crashing IIS app pool

  - by Joseph

  IIS 7.5, server 2008 r2, classic asp and asp .net 2.0, 3.5 website same server, same app pool. The past 4 weeks thousands of these errors 'C0000005' are occurring. I know from IIS debug diag tool that 'C0000005' is an access violation error. Below is the top line from my debug diag report. In w3wp__PID__6656__Date__01_08_2011__Time_01_42_46AM__281__First Chance Access Violation.dmp the assembly instruction at asp!CActiveScriptEngine::GetApplication+27 in \\?\C:\Windows\System32\inetsrv\asp.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000000 on thread 29 Thread 29 - System ID 6736 Entry point 0x00000000 Create time 1/8/2011 12:46:26 AM Time spent in user mode 0 Days 00:00:00.140 Time spent in kernel mode 0 Days 00:00:00.078 Function Source asp!CActiveScriptEngine::GetApplication+27 vbscript!COleScript::GetDebugApplicationCoreNoRef+2b vbscript!COleScript::FDebuggerEnabled+30 vbscript!COleScript::SetScriptSite+cd asp!CActiveScriptEngine::Init+125 asp!CScriptManager::GetEngine+252 asp!AllocAndLoadEngines+28f asp!ExecuteGlobal+17a asp!Execute+b5 asp!CHitObj::ViperAsyncCallback+3fc asp!CViperAsyncRequest::OnCall+6a comsvcs!CSTAActivityWork::STAActivityWorkHelper+32 ole32!EnterForCallback+f4 ole32!SwitchForCallback+1a8 ole32!PerformCallback+a3 ole32!CObjectContext::InternalContextCallback+15b ole32!CObjectContext::DoCallback+1c comsvcs!CSTAActivityWork::DoWork+12f comsvcs!CSTAThread::DoWork+18 comsvcs!CSTAThread::ProcessQueueWork+37 comsvcs!CSTAThread::WorkerLoop+135 msvcrt!_endthreadex+44 msvcrt!_endthreadex+ce kernel32!BaseThreadInitThunk+e ntdll!__RtlUserThreadStart+70 ntdll!_RtlUserThreadStart+1b BELOW is the faulting module. ASP report Executing ASP requests 0 Request(s) ASP templates cached 0 Template(s) ASP template cache size 0.00 Bytes Loaded ASP applications 1 Application(s) ASP.DLL Version 7.5.7600.16620 ASP application report ASP application metabase key Physical Path Virtual Root Session Count 0 Session(s) Request Count 0 Request(s) Session Timeout 0 minutes(s) Path to Global.asa Server side script debugging enabled False Client side script debugging enabled False Out of process COM servers allowed False Session state turned on False Write buffering turned on False Application restart enabled False Parent paths enabled False ASP Script error messages will be sent to browser False ASP!CACTIVESCRIPTENGINE::GETAPPLICATION+27In w3wp__PID__6656__Date__01_08_2011__Time_01_42_46AM__281__First Chance Access Violation.dmp the assembly instruction at asp!CActiveScriptEngine::GetApplication+27 in \\?\C:\Windows\System32\inetsrv\asp.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000000 on thread 29 recent events: server was being brute forced by hackers all of Dec and probably earlier, they weren't able to gain access but did get a virus on and blasted out spam. insatlled AVG and about the 17 or 22 latest patches. after that the app pool started crashing and the server has crashed a couple times since then. I am in no mans land as I am a developer and not a sys admin but I have to assume many roles. So I'm reaching out for help. Sometimes I will see hundreds of these 'C0000005' scriptengine errors in the event log in a matter of seconds and other times just a few times an hour. I googled this line 'ASP!CACTIVESCRIPTENGINE::GETAPPLICATION' and got nothing. Its like the function don't exist or something. I have spent many hours google-ing to no avail and am now turning to the experts on the forums. Thank you for your help

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• Nagios shell script cannot be executed

  - by MeinAccount

  I'm trying to monitor GitLab with nagios. I've created the following command definition and shell script but when checking the service I'm receiving the following e-mail. How can I solve this? The file is executable. [...] nagios : 3 incorrect password attempts ; TTY=unknown ; PWD=/ ; USER=git ; COMMAND=/bin/bash -c /var/lib/nagios/custom_plugins/check_gitlab.sh Command definition: define command { command_name custom_check_gitlab command_line /var/lib/nagios/custom_plugins/check_gitlab.sh } Shell script: #! /bin/sh # [...] RAILS_ENV="production" # Script variable names should be lower-case not to conflict with internal /bin/sh variables such as PATH, EDITOR or SHELL. app_root="/home/git/gitlab" app_user="git" unicorn_conf="$app_root/config/unicorn.rb" pid_path="$app_root/tmp/pids" socket_path="$app_root/tmp/sockets" web_server_pid_path="$pid_path/unicorn.pid" sidekiq_pid_path="$pid_path/sidekiq.pid" ### Here ends user configuration ### # Switch to the app_user if it is not he/she who is running the script. if [ "$USER" != "$app_user" ]; then sudo -u "$app_user" -H -i $0 "$@"; exit; fi # Switch to the gitlab path, if it fails exit with an error. if ! cd "$app_root" ; then echo "Failed to cd into $app_root, exiting!"; exit 1 fi ### Init Script functions check_pids(){ if ! mkdir -p "$pid_path"; then echo "Could not create the path $pid_path needed to store the pids." exit 1 fi # If there exists a file which should hold the value of the Unicorn pid: read it. if [ -f "$web_server_pid_path" ]; then wpid=$(cat "$web_server_pid_path") else wpid=0 fi if [ -f "$sidekiq_pid_path" ]; then spid=$(cat "$sidekiq_pid_path") else spid=0 fi } # Checks whether the different parts of the service are already running or not. check_status(){ check_pids # If the web server is running kill -0 $wpid returns true, or rather 0. # Checks of *_status should only check for == 0 or != 0, never anything else. if [ $wpid -ne 0 ]; then kill -0 "$wpid" 2>/dev/null web_status="$?" else web_status="-1" fi if [ $spid -ne 0 ]; then kill -0 "$spid" 2>/dev/null sidekiq_status="$?" else sidekiq_status="-1" fi } check_pids check_status if [ "$web_status" != "0" -a "$sidekiq_status" != "0" ]; then echo "GitLab is not running." exit 2 fi if [ "$web_status" != "0" ]; then printf "The GitLab Unicorn webserver is \033[31mnot running\033[0m.\n" exit 1 fi if [ "$sidekiq_status" != "0" ]; then printf "The GitLab Sidekiq job dispatcher is \033[31mnot running\033[0m.\n" exit 1 fi if [ "$web_status" = "0" -a "$sidekiq_status" = "0" ]; then printf "GitLab and all it's components are \033[32mup and running\033[0m.\n" exit 0 fi

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• Can't save screen resolution setting.

  - by Searock

  Hi, My screen resolution in windows and previous version of Ubuntu (9.04) was 1152 x 864. But in Ubuntu 10.04 it gives me an option of 1024 x 786 and 1360 x 786. I have some how managed to add 1152x684 resolution by using xrandr command. searock@searock-desktop:~$ cvt 1152 864 1152x864 59.96 Hz (CVT 1.00M3) hsync: 53.78 kHz; pclk: 81.75 MHz Modeline "1152x864_60.00" 81.75 1152 1216 1336 1520 864 867 871 897 -hsync +vsync searock@searock-desktop:~$ xrandr --newmode "1152x864_60.00" 81.75 1152 1216 1336 1520 864 867 871 897 -hsync +vsync searock@searock-desktop:~$ xrandr --addmode S-video 1152x864 xrandr: cannot find output "S-video" searock@searock-desktop:~$ xrandr Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096 VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm 1360x768 59.8 1024x768 60.0* 800x600 60.3 56.2 848x480 60.0 640x480 59.9 59.9 1152x864_60.00 (0x124) 81.0MHz h: width 1152 start 1216 end 1336 total 1520 skew 0 clock 53.3KHz v: height 864 start 867 end 871 total 897 clock 59.4Hz searock@searock-desktop:~$ xrandr --addmode VGA1 1152x864_60.00 But the problem is when ever I restart my computer I get this message. Could not apply the stored configuration for the monitors. Could not find a suitable configuration of screens. And then it comes back to 1024 x 786 My graphic card details : Intel(R) 82945G Express Chipset Family. Is there any way I can fix this once for all ? Thanks. Edit 1 : rumtscho has suggested me to modify xorg.conf file. But I am not sure what HorizSync means? is it Horizontal frequency ? My monitor model is Acer v173. Here's my specification. So what should be HorizSync and VertRefresh ? Edit 2 : I have edited my Xorg.conf file as follows : Section "Monitor" Identifier "Configured Monitor" HorizSync 30-80 VertRefresh 55-75 EndSection then I added the resolution and restarted my computer and still I am facing the same problem. Is there something that I am missing? Edit 3 : For now I have edited /etc/gdm/Init/Default(gdm startup scripts) to include following xrandr commands, just below line initctl -q emit login-session-start DISPLAY_MANAGER=gdm xrandr --newmode "1152x864_60.00" 81.75 1152 1216 1336 1520 864 867 871 897 -hsync +vsync xrandr --addmode VGA1 1152x864_60.00<br/> xrandr -s 1152x864_60.00 This has solved my problem, but this commands have increased my computer's boot time. I think I will have to edit xorg file properly. Edit 4 : Instead of adding this files to gdm startup scripts I have created a shell script and added it to startup (System - Preference - Startup Applications) #!/bin/bash xrandr --newmode "1152x864_60.00" 81.75 1152 1216 1336 1520 864 867 871 897 -hsync +vsync xrandr --addmode VGA1 1152x864_60.00 xrandr -s 1152x864_60.00 And don't forget to add execution rights. (Right Click - Properties - Permission - Allow executing file as program)

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• Plesk Postfix Mail Server 9.5.4 very heavy load, 1000s of processes

  - by Eugene van der Merwe

  Our Plesk Linux Ubuntu 64-bit mail server has extremely high load and we don't know how to isolate it. The load was okay will two weeks ago but in the last two weeks it's seriously deteriorated. The mail server has been running for years and we have had sporadic performance issues. Normally we reduce the load by turning off all SPAM checks until the problem is sorted (which sometimes resolves itself). Currently we have turned of real time block lists, SPF checking and we have attempted to turn off SpamAssassin. No matter what we do the SpamAssassin check box stays ticked in the GUI. Out of desperation we have done /etc/init.d/psa-spamassassin stop. For years we haven't been able to do SpamAssassin because it kills the server. We would like to use it but performance is more important for now. We cannot turn off Greylisting. The moment we turn off Greylisting our help desk is inandated with calls. Out of desperation we investigated truncating the Greylisting database which is now 2.5 GB big but we abandoned this after noticing turning of Greylisting doesn't improve the performance at all. We have no anti-virus. It's just more load and Dr. Web never really worked that well for us. But we'll try that if it will make a difference. We have implemented Postfix Anvil. This seems to have made the situation worse so we disabled it. We’re not sure if this is the case. Our current mail server is configured to forward all SMTP to a relay server. We did so to reduce the load. This helped a lot because outgoing queues are generally empty. We are running in an Expand configuration. The mail server has about 12 000 accounts of which maybe half are active. We have read through this document: http://www.postfix.org/STRESS_README.html but there are too many settings and we don’t know which ones to choose. Please assist urgently. We need advice on how to fix this problem before all our clients abandon is. The only clue we have is that there are 100s of these processes: 30 13205 1 0 13:18 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10027 before-queue 30 13207 1 0 11:38 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10027 before-queue 30 13208 1 0 13:18 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10026 before-remote 30 13209 1 0 11:38 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10026 before-remote 30 13213 1 0 13:18 ? 00:00:00 /usr/lib/plesk-9.0/postfix-queue 127.0.0.1 10027 before-queue

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• Failed to start up after upgrading software in ubuntu 10.10

  - by Landy

  I've been running Ubuntu 10.10 in a physical x86-64 machine. Today Update Manager reminded me that there are some updates to install and I confirmed the action. I should had read the update list but I didn't. I can only remember there is an update about cups. After the upgrading, Update Manager requires a restart and I confirmed too. But after the restart, the computer can't start up. There are errors in the console. Begin: Running /scripts/init-premount ... done. Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done. [xxx]usb 1-8: new high speed USB device using ehci_hcd and address 3 [xxx]usb 2-1: new full speed USB device using ohci_hcd and address 2 [xxx]hub 2-1:1.0: USB hub found [xxx]hub 2-1:1.0: 4 ports detected [xxx]usb 2-1.1: new low speed USB device using ohci_hcd and address 3 Gave up waiting for root device. Common probles: - Boot args (cat /proc/cmdline) - Check rootdelay=(did the system wait long enough) - Check root= (did the system wait for the right device?) - Missing modules (cat /proc/modules; ls /dev) FATAL: Could not load /lib/modules/2.6.35-22-generic/modules.dep: No such file or directory FATAL: Could not load /lib/modules/2.6.35-22-generic/modules.dep: No such file or directory ALERT! /dev/sda1 does not exist. Dropping to a shell! BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell(ash) Enter 'help' for a list of built-in commands. (initramfs)[cursor is here] At the moment, I can't input anything in the console. The keyboard doesn't work at all. What's wrong? How can I check boot args or "root=" as suggested? How can I fix this issue? Thanks. =============== PS1: the /dev/sda1 is type ext4 (rw,nosuid,nodev) PS2: the /dev/sda1 can be mounted and accessed successfully under SUSE 11 SP1 x64.

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• Nagios core Event Handler not working

  - by sivashanmugam

  Nagios Event Handler is not triggering when the service is taking more time to response or down. My configuration in below nagios.cfg enable_event_handlers=1 localhost.cfg define service { use generic-service host_name Server service_description test-server servicegroups test-service check_command check-service is_volatile 0 check_period 24x7 max_check_attempts 4 normal_check_interval 2 retry_check_interval 2 contact_groups testcontacts notification_period 24x7 notification_options w,u,c,r notifications_enabled 1 event_handler_enabled 1 event_handler recheck-service } command.cfg define command{ command_name recheck-service command_line /usr/local/nagios/libexec/alert.sh $SERVICESTATE$ $SERVICESTATETYPE$ $SERVICEATTEMPT$ } alert.sh file !/bin/sh set -x case "$1" in OK) # The service just came back up, so don't do anything... ;; WARNING) # We don't really care about warning states, since the service is probably still running... ;; UNKNOWN) # We don't know what might be causing an unknown error, so don't do anything... ;; CRITICAL) Aha! The HTTP service appears to have a problem - perhaps we should restart the server... Is this a "soft" or a "hard" state? case "$2" in We're in a "soft" state, meaning that Nagios is in the middle of retrying the check before it turns into a "hard" state and contacts get notified... SOFT) # What check attempt are we on? We don't want to restart the web server on the first check, because it may just be a fluke! case "$3" in Wait until the check has been tried 3 times before restarting the web server. If the check fails on the 4th time (after we restart the web server), the state type will turn to "hard" and contacts will be notified of the problem. Hopefully this will restart the web server successfully, so the 4th check will result in a "soft" recovery. If that happens no one gets notified because we fixed the problem! 3) echo -n "Going To Ping the Virtual Machine (3rd soft critical state)..." # Call the init script to restart the HTTPD server myresult=`/usr/local/nagios/libexec/check_http xyz.com -t 100 | grep 'time'| awk '{print $10}'` echo "Your Service Is taking the following time Delay" "$myresult Seconds" |mail -s "WARNING : Service Taken More Time To Response" [email protected] ;; esac ;; # The HTTP service somehow managed to turn into a hard error without getting fixed. # It should have been restarted by the code above, but for some reason it didn't. # Let's give it one last try, shall we? # Note: Contacts have already been notified of a problem with the service at this

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• New CentOS/cPanel servers showing high load averages at idle

  - by Jax

  I have taken delivery of two identically specced CentOS/cPanel servers, showing the same behaviour of a resting load average of 1.30, 1.21, 1.16 and yet the CPU is sitting 100% idle. Hardware: Xeon(R) CPU E3-1270 4GB RAM Behavior:- top shows CPU 99.9% idle virtually no disk IO Some command output :- uname -a Linux server.myserver.com 2.6.18-308.4.1.el5PAE #1 SMP Tue Apr 17 17:47:38 EDT 2012 i686 i686 i386 GNU/Linux top top - 10:37:50 up 1:47, 1 user, load average: 1.28, 1.20, 1.17 Tasks: 199 total, 1 running, 198 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 99.9%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 4125104k total, 438764k used, 3686340k free, 25788k buffers Swap: 2096440k total, 0k used, 2096440k free, 291080k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2160 640 552 S 0.0 0.0 0:00.89 init 2 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 3 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0 4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0 5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/1 6 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/1 7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1 8 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/2 9 root 35 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/2 10 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/2 11 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/3 12 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/3 13 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/3 14 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/4 15 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/4 16 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/4 17 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/5 18 root 38 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/5 19 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/5 20 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/6 21 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/6 22 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/6 23 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/7 24 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/7 25 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/7 26 root 10 -5 0 0 0 S 0.0 0.0 0:06.42 events/0 27 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/1 28 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/2 29 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/3 30 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/4 31 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/5 32 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/6 33 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 events/7 34 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 khelper 35 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kthread 45 root 13 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/0 46 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/1 47 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/2 48 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/3 49 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/4 50 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/5 51 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/6 52 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/7 53 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 kacpid 189 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/0 190 root 11 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/1 191 root 12 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/2 192 root 12 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/3 193 root 13 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/4 194 root 13 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/5 195 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/6 196 root 14 -5 0 0 0 S 0.0 0.0 0:00.00 cqueue/7 199 root 10 -5 0 0 0 S 0.0 0.0 0:00.00 khubd ps axf PID TTY STAT TIME COMMAND 1 ? Ss 0:00 init [3] 2 ? S< 0:00 [migration/0] 3 ? SN 0:00 [ksoftirqd/0] 4 ? S< 0:00 [watchdog/0] 5 ? S< 0:00 [migration/1] 6 ? SN 0:00 [ksoftirqd/1] 7 ? S< 0:00 [watchdog/1] 8 ? S< 0:00 [migration/2] 9 ? SN 0:00 [ksoftirqd/2] 10 ? S< 0:00 [watchdog/2] 11 ? S< 0:00 [migration/3] 12 ? SN 0:00 [ksoftirqd/3] 13 ? S< 0:00 [watchdog/3] 14 ? S< 0:00 [migration/4] 15 ? SN 0:00 [ksoftirqd/4] 16 ? S< 0:00 [watchdog/4] 17 ? S< 0:00 [migration/5] 18 ? SN 0:00 [ksoftirqd/5] 19 ? S< 0:00 [watchdog/5] 20 ? S< 0:00 [migration/6] 21 ? SN 0:00 [ksoftirqd/6] 22 ? S< 0:00 [watchdog/6] 23 ? S< 0:00 [migration/7] 24 ? SN 0:00 [ksoftirqd/7] 25 ? S< 0:00 [watchdog/7] 26 ? S< 0:06 [events/0] 27 ? S< 0:00 [events/1] 28 ? S< 0:00 [events/2] 29 ? S< 0:00 [events/3] 30 ? S< 0:00 [events/4] 31 ? S< 0:00 [events/5] 32 ? S< 0:00 [events/6] 33 ? S< 0:00 [events/7] 34 ? S< 0:00 [khelper] 35 ? S< 0:00 [kthread] 45 ? S< 0:00 \_ [kblockd/0] 46 ? S< 0:00 \_ [kblockd/1] 47 ? S< 0:00 \_ [kblockd/2] 48 ? S< 0:00 \_ [kblockd/3] 49 ? S< 0:00 \_ [kblockd/4] 50 ? S< 0:00 \_ [kblockd/5] 51 ? S< 0:00 \_ [kblockd/6] 52 ? S< 0:00 \_ [kblockd/7] 53 ? S< 0:00 \_ [kacpid] 189 ? S< 0:00 \_ [cqueue/0] 190 ? S< 0:00 \_ [cqueue/1] 191 ? S< 0:00 \_ [cqueue/2] 192 ? S< 0:00 \_ [cqueue/3] 193 ? S< 0:00 \_ [cqueue/4] 194 ? S< 0:00 \_ [cqueue/5] 195 ? S< 0:00 \_ [cqueue/6] 196 ? S< 0:00 \_ [cqueue/7] 199 ? S< 0:00 \_ [khubd] 201 ? S< 0:00 \_ [kseriod] 301 ? S 0:00 \_ [khungtaskd] 302 ? S 0:00 \_ [pdflush] 303 ? S 0:00 \_ [pdflush] 304 ? S< 0:00 \_ [kswapd0] 305 ? S< 0:00 \_ [aio/0] 306 ? S< 0:00 \_ [aio/1] 307 ? S< 0:00 \_ [aio/2] 308 ? S< 0:00 \_ [aio/3] 309 ? S< 0:00 \_ [aio/4] 310 ? S< 0:00 \_ [aio/5] 311 ? S< 0:00 \_ [aio/6] 312 ? S< 0:00 \_ [aio/7] 472 ? S< 0:00 \_ [kpsmoused] 551 ? S< 0:00 \_ [ata/0] 552 ? S< 0:00 \_ [ata/1] 553 ? S< 0:00 \_ [ata/2] 554 ? S< 0:00 \_ [ata/3] 555 ? S< 0:00 \_ [ata/4] 556 ? S< 0:00 \_ [ata/5] 557 ? S< 0:00 \_ [ata/6] 558 ? S< 0:00 \_ [ata/7] 559 ? S< 0:00 \_ [ata_aux] 569 ? S< 0:00 \_ [scsi_eh_0] 570 ? S< 0:00 \_ [scsi_eh_1] 571 ? S< 0:00 \_ [scsi_eh_2] 572 ? S< 0:00 \_ [scsi_eh_3] 573 ? S< 0:00 \_ [scsi_eh_4] 574 ? S< 0:00 \_ [scsi_eh_5] 593 ? S< 0:00 \_ [kstriped] 630 ? S< 0:00 \_ [kjournald] 655 ? S< 0:00 \_ [kauditd] 1860 ? S< 0:00 \_ [kmpathd/0] 1861 ? S< 0:00 \_ [kmpathd/1] 1862 ? S< 0:00 \_ [kmpathd/2] 1863 ? S< 0:00 \_ [kmpathd/3] 1864 ? S< 0:00 \_ [kmpathd/4] 1865 ? S< 0:00 \_ [kmpathd/5] 1866 ? S< 0:00 \_ [kmpathd/6] 1867 ? S< 0:00 \_ [kmpathd/7] 1868 ? S< 0:00 \_ [kmpath_handlerd] 1902 ? S< 0:00 \_ [kjournald] 1904 ? S< 0:00 \_ [kjournald] 1906 ? S< 0:00 \_ [kjournald] 1908 ? S< 0:00 \_ [kjournald] 1910 ? S< 0:00 \_ [kjournald] 2184 ? S< 0:00 \_ [iscsi_eh] 2288 ? S< 0:00 \_ [cnic_wq] 2298 ? S< 0:00 \_ [bnx2i_thread/0] 2299 ? S< 0:00 \_ [bnx2i_thread/1] 2300 ? S< 0:00 \_ [bnx2i_thread/2] 2301 ? S< 0:00 \_ [bnx2i_thread/3] 2302 ? S< 0:00 \_ [bnx2i_thread/4] 2303 ? S< 0:00 \_ [bnx2i_thread/5] 2304 ? S< 0:00 \_ [bnx2i_thread/6] 2305 ? S< 0:00 \_ [bnx2i_thread/7] 2330 ? S< 0:00 \_ [ib_addr] 2359 ? S< 0:00 \_ [ib_mcast] 2360 ? S< 0:00 \_ [ib_inform] 2361 ? S< 0:00 \_ [local_sa] 2371 ? S< 0:00 \_ [iw_cm_wq] 2381 ? S< 0:00 \_ [ib_cm/0] 2382 ? S< 0:00 \_ [ib_cm/1] 2383 ? S< 0:00 \_ [ib_cm/2] 2384 ? S< 0:00 \_ [ib_cm/3] 2385 ? S< 0:00 \_ [ib_cm/4] 2386 ? S< 0:00 \_ [ib_cm/5] 2387 ? S< 0:00 \_ [ib_cm/6] 2388 ? S< 0:00 \_ [ib_cm/7] 2398 ? S< 0:00 \_ [rdma_cm] 2684 ? S< 0:00 \_ [bond0] 2882 ? S< 0:00 \_ [bond1] 3195 ? S< 0:00 \_ [kondemand/0] 3197 ? S< 0:00 \_ [kondemand/1] 3198 ? S< 0:00 \_ [kondemand/2] 3199 ? S< 0:00 \_ [kondemand/3] 3200 ? S< 0:00 \_ [kondemand/4] 3201 ? S< 0:00 \_ [kondemand/5] 3202 ? S< 0:00 \_ [kondemand/6] 3203 ? S< 0:00 \_ [kondemand/7] 688 ? S<s 0:00 /sbin/udevd -d 2425 ? S<Lsl 0:00 iscsiuio 2432 ? Ss 0:00 iscsid 2434 ? S<Ls 0:00 iscsid 3061 ? S<sl 0:00 auditd 3063 ? S<sl 0:00 \_ /sbin/audispd 3121 ? Ss 0:00 syslogd -m 0 3124 ? Ss 0:00 klogd -x 3220 ? Ss 0:00 irqbalance 3278 ? Ss 0:00 dbus-daemon --system 3324 ? Ss 0:00 /usr/sbin/acpid 3337 ? Ss 0:00 hald 3338 ? S 0:00 \_ hald-runner 3345 ? S 0:00 \_ hald-addon-acpi: listening on acpid socket /var/run/acpid.socket 3349 ? S 0:00 \_ hald-addon-keyboard: listening on /dev/input/event1 3360 ? S 0:00 \_ hald-addon-storage: polling /dev/sr0 3413 ? Ssl 0:00 automount 3435 ? Ssl 0:00 /usr/sbin/named -u named 3466 ? Ss 0:00 /usr/sbin/sshd 4072 ? Ss 0:00 \_ sshd: root@pts/0 4078 pts/0 Ss 0:00 \_ -bash 5436 pts/0 R+ 0:00 \_ ps axf 3484 ? Ss 0:00 xinetd -stayalive -pidfile /var/run/xinetd.pid 3500 ? SLs 0:00 ntpd -u ntp:ntp -p /var/run/ntpd.pid -g 3514 ? S 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/server.myserver.com.pid 3575 ? Sl 0:00 \_ /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log-error=/var/lib/mysql/server.myserver.com.err --pid-fil 3687 ? Ss 0:00 /usr/sbin/exim -bd -q1h 3709 ? Ss 0:00 /usr/sbin/dovecot 3710 ? S 0:00 \_ dovecot-auth 3725 ? S 0:00 \_ pop3-login 3726 ? S 0:00 \_ pop3-login 3727 ? S 0:00 \_ imap-login 3728 ? S 0:00 \_ imap-login 3729 ? Ss 0:00 /usr/local/apache/bin/httpd -k start -DSSL 4326 ? S 0:00 \_ /usr/bin/perl /usr/local/cpanel/bin/leechprotect 4332 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4333 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4334 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4335 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4336 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4337 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4382 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4383 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 4384 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 5389 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 5390 ? S 0:00 \_ /usr/local/apache/bin/httpd -k start -DSSL 3741 ? Ss 0:00 pure-ftpd (SERVER) 3746 ? S 0:00 /usr/sbin/pure-authd -s /var/run/ftpd.sock -r /usr/sbin/pureauth 3759 ? Ss 0:00 crond 3772 ? Ss 0:00 /usr/sbin/atd 3909 ? S 0:00 cpsrvd (SSL) - waiting for connections 5435 ? Z 0:00 \_ [cpsrvd-ssl] <defunct> 3931 ? S 0:00 queueprocd - wait to process a task 3948 ? S 0:00 tailwatchd 3954 ? SN 0:00 cpanellogd - sleeping for logs 4003 ? Ss 0:00 ./nimbus /opt/nimsoft 4016 ? S 0:00 \_ nimbus(controller) 4053 ? Sl 0:00 \_ nimbus(spooler) 4066 ? S 0:00 \_ nimbus(hdb) 4069 ? S 0:00 \_ nimbus(cdm) 4070 ? S 0:00 \_ nimbus(processes) 4023 ? S 0:00 /usr/sbin/smartd -q never 4027 tty1 Ss+ 0:00 /sbin/mingetty tty1 4028 tty2 Ss+ 0:00 /sbin/mingetty tty2 4029 tty3 Ss+ 0:00 /sbin/mingetty tty3 4030 tty4 Ss+ 0:00 /sbin/mingetty tty4 4031 tty5 Ss+ 0:00 /sbin/mingetty tty5 4033 tty6 Ss+ 0:00 /sbin/mingetty tty6 4035 ttyS1 Ss+ 0:00 /sbin/agetty -h -L ttyS1 19200 vt100 vmstat 10 6 procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 3718136 25684 257424 0 0 8 3 127 189 0 0 100 0 0 0 0 0 3718136 25700 257420 0 0 0 7 1013 1500 0 0 100 0 0 0 0 0 3718136 25700 257424 0 0 0 1 1013 1551 0 0 100 0 0 0 0 0 3718136 25700 257424 0 0 0 0 1012 1469 0 0 100 0 0 1 0 0 3712680 25716 257424 0 0 0 2 1013 1542 0 0 100 0 0 0 0 0 3718376 25740 257424 0 0 0 46 1017 1534 0 0 100 0 0 Can anyone advise me as to what is the cause of and how I may resolve this behaviour? A kernel/driver conflict perhaps? I don't see any processes in R or D state that might inflate the load averages artificially, I realise it may be considered low in an 8 thread system but its higher at idle than any normal behaviour I've previously come across. Thanks in advance for your time. Edit: iotop Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 26 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.29 % [events/0] 3205 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.10 % [kondemand/2] 3208 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/5] 3209 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/6] 3207 be/3 root 0.00 B/s 0.00 B/s 0.10 % 0.00 % [kondemand/4] 3210 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/7] 3227 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % irqbalance 3288 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rpciod/1] 3287 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [rpciod/0] 3206 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kondemand/3] 3069 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % auditd 3070 be/2 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % audispd 655 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kauditd] 3619 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % automount 3 be/7 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [ksoftirqd/0] 3068 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % auditd 29 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/3] 4 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/0] 7 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/1] 10 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/2] 13 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/3] 16 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/4] 19 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/5] 22 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/6] 25 rt/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [watchdog/7] 27 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/1] 28 be/3 root 0.00 B/s 0.00 B/s 0.29 % 0.00 % [events/2] 30 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/4] 31 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/5] 32 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/6] 33 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [events/7] 34 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [khelper] 35 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kthread] 45 be/3 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % [kblockd/0]

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• How to setup GIT repo on server with need for working dir (non- bare)

  - by OrangeTux

  I want to have configurate a GIT repo for a website. Multiple users will have a clone of the repo on their local machine and on the end of each day they push their work to the server. I can setup a bare repo, but I want a working dir/non-bare repository. The idea is that the working dir of the repository will the root folder for the website. At the end of each day all changes will be visible directly. But I can't find a way to do this. Initializing the server repo with git init gives the following error when a client is trying to push some files: git push origin master [email protected]'s password: Counting objects: 3, done. Writing objects: 100% (3/3), 227 bytes, done. Total 3 (delta 0), reused 0 (delta 0) remote: error: refusing to update checked out branch: refs/heads/master remote: error: By default, updating the current branch in a non-bare repository remote: error: is denied, because it will make the index and work tree inconsistent remote: error: with what you pushed, and will require 'git reset --hard' to match remote: error: the work tree to HEAD. remote: error: remote: error: You can set 'receive.denyCurrentBranch' configuration variable to remote: error: 'ignore' or 'warn' in the remote repository to allow pushing into remote: error: its current branch; however, this is not recommended unless you remote: error: arranged to update its work tree to match what you pushed in some remote: error: other way. remote: error: remote: error: To squelch this message and still keep the default behaviour, set remote: error: 'receive.denyCurrentBranch' configuration variable to 'refuse'. To ssh://[email protected]/home/orangetux/www/ ! [remote rejected] master -> master (branch is currently checked out) error: failed to push some refs to 'ssh://[email protected]/home/orangetux/www/' So I'm wondering if this the right way to setup a GIT repo for a website? If so, how do I have to do this? If not, what is a better way to setup a GIT repo for the development of a website? EDIT you can't push to a non-bare repository Oke, clear. But whats the way to solve my problem? Create a bare repository on the server and have a clone of this repo on the same server in the htdocs folder? This looks a bit clumsy to me. To see the result of a commit I've to clone the repository each time.

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• NTP daemon or ntpdate doesn't synchronize

  - by user2862333

  I'm having some problems with synchronization with an NTP server. 1) The NTP daemon doesn't sync the system clock at all, even though it's running (confirmed with /etc/init.d/ntp status). Forcing to sync with ntpd -q or ntpd -gq does not work either. 2) Stopping the NTP daemon and syncing manually with ntpdate does give me the following output: ~# ntpdate -d 0.debian.pool.ntp.org 6 Nov 16:48:53 ntpdate[4417]: ntpdate [email protected] Sat May 12 09:07:19 UTC 2012 (1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) transmit(79.132.237.5) receive(79.132.237.5) transmit(85.234.197.2) receive(85.234.197.2) transmit(194.50.97.34) receive(194.50.97.34) transmit(79.132.237.1) receive(79.132.237.1) server 79.132.237.5, port 123 stratum 2, precision -20, leap 00, trust 000 refid [79.132.237.5], delay 0.05141, dispersion 0.00145 transmitted 4, in filter 4 reference time: d624e3b1.f490b90d Wed, Nov 6 2013 16:50:09.955 originate timestamp: d624e457.eaaf787c Wed, Nov 6 2013 16:52:55.916 transmit timestamp: d624e36c.4a7036fd Wed, Nov 6 2013 16:49:00.290 filter delay: 0.08537 0.05141 0.05151 0.06346 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6038 235.6087 235.6095 235.6068 0.000000 0.000000 0.000000 0.000000 delay 0.05141, dispersion 0.00145 offset 235.608782 server 85.234.197.2, port 123 stratum 2, precision -20, leap 00, trust 000 refid [85.234.197.2], delay 0.05151, dispersion 0.00336 transmitted 4, in filter 4 reference time: d624e3e7.dc6cd02b Wed, Nov 6 2013 16:51:03.861 originate timestamp: d624e458.1c91031f Wed, Nov 6 2013 16:52:56.111 transmit timestamp: d624e36c.7da1d882 Wed, Nov 6 2013 16:49:00.490 filter delay: 0.05765 0.07750 0.06013 0.05151 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6048 235.6014 235.6035 235.6078 0.000000 0.000000 0.000000 0.000000 delay 0.05151, dispersion 0.00336 offset 235.607826 server 194.50.97.34, port 123 stratum 3, precision -23, leap 00, trust 000 refid [194.50.97.34], delay 0.03021, dispersion 0.00090 transmitted 4, in filter 4 reference time: d624e38d.2bce952c Wed, Nov 6 2013 16:49:33.171 originate timestamp: d624e458.4dbbc114 Wed, Nov 6 2013 16:52:56.303 transmit timestamp: d624e36c.b0d38834 Wed, Nov 6 2013 16:49:00.690 filter delay: 0.03030 0.03636 0.03091 0.03021 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6095 235.6085 235.6098 235.6105 0.000000 0.000000 0.000000 0.000000 delay 0.03021, dispersion 0.00090 offset 235.610589 server 79.132.237.1, port 123 stratum 3, precision -20, leap 00, trust 000 refid [79.132.237.1], delay 0.05113, dispersion 0.00305 transmitted 4, in filter 4 reference time: d624dfcb.6acea332 Wed, Nov 6 2013 16:33:31.417 originate timestamp: d624e458.838672ad Wed, Nov 6 2013 16:52:56.513 transmit timestamp: d624e36c.e405181c Wed, Nov 6 2013 16:49:00.890 filter delay: 0.06345 0.05113 0.05681 0.05656 0.00000 0.00000 0.00000 0.00000 filter offset: 235.6087 235.6038 235.6010 235.6074 0.000000 0.000000 0.000000 0.000000 delay 0.05113, dispersion 0.00305 offset 235.603888 6 Nov 16:49:00 ntpdate[4417]: step time server 79.132.237.5 offset 235.608782 sec Clearly, ntpdate can reach the NTP server(s), but after checking the clock, it hasn't changed and is still displaying the wrong time. Any ideas what would be the problem would be much appreciated.

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• Linux bonded Interfaces hanging periodically

  - by David

  I've several hosts that are showing problems with connectivity. When working from the command line, for example, typing is frozen for a second or so, then recovers - then it does it again. The most egregious example host would freeze (input) for 15-30 seconds, then recover and go out 5 seconds later. Switching cables didn't do anything - but removing one of the physical cables caused everything to clear up instantly (which why I think this is a network problem). Looking at the network I couldn't see any packets floating that would explain this. These ethernet interfaces (Gigabit Dell) were working normally previously, but since we moved the systems - and put them on a new set of switches - this has been a problem on multiple theoretically identically-configured hosts. The original switches were an HP Procurve 1810-24G and an HP Procurve 1800-24G connected with LLDP; the new switches are both Cisco SG 200-26, which I understand are rebranded Linksys switches. Is this caused by a problem with the switches? Is it the switch configurations? Are the Cisco switches incapable of handling this? I don't see where the configuration is located; I searched the usual /etc/sysconfig/network/devices but there's nothing in there about options (like mii polling) and nothing about the method of balancing the two. Searching scripts, I can't find anything in /etc/init.d/network either. The hosts are almost all Red Hat Enterprise Linux 5.x systems (5.6, 5.7) but some are Ubuntu Server 10.04.3 Lucid Lynx. I need help with both if it comes to that. UPDATE: We're also seeing some problems with servers on the original switches. The HP switches and the Cisco switches are also interconnected (temporarily); there is a cable run from one switch to the next. Pings on any of these hosts show about one ICMP packet out of every 5-6 getting dropped (timed out). Could there be an interaction between the two switches? Oh, and the hosts are using bonding with Balance-RR as the method.

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• Trying to grok Linux quotas, where is the data stored?

  - by CarpeNoctem

  So all the tutorials and documentation for the Linux quota system has left me confused. For each filesystem with quotas enabled/on where is the actual quota information stored? Is it filesystem metadata or is it in a file? Say user foo creates a new file on /home. How does the kernel determine whether user foo is below their hard limit? Does the kernel have to tally up quota information on that filesystem each time or is it in the superblock or somewhere else? As far as I understand, the kernel consults the aquota.user file for the actual rules, but where is the current quota usage data stored? Can this be viewed with any tools outside repquota and the like? TIA!! Update: Thanks for the help. I had already read that mini-HOWTO. I am pretty clear on the usage of the user space tools. What I was unclear on is whether the usage data was ALSO in the file that stored per-user limits and you answered this with a yes. From what I can tell, rc.sysinit runs quotacheck and quotaon on startup. The quotacheck program analyzes the filesystem, updates the aquota.* files. It then makes use of quota.h and the quotactl() syscall to inform the kernel of quota info. From this point forward the kernel hashes that information and increments/decrements quota stats as changes occur. Upon shutdown, the init.d/halt script runs the quotaoff command RIGHT before the filesystems are unmounted. The quotaoff command does not appear to update the aquota.* files with the information the kernel has in memory. I say this because the {a,c,m}times for the aquota.user file are only updated upon a reboot of the system or by manual running the quotacheck command. It appears - as far as I can tell - that the kernel just drops it's up-to-date usage data on the floor at shutdown. This information is never used to update the aquota.* files. They are updated during startup by quotacheck(rc.sysinit). Seems silly to me since that updated info had already been collected by the kernel. So...in conclusion I am still not entirely clear on the methods. ;)

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• Hyper-V Ubuntu Networking Problems Copying Large Amounts of Data

  - by Anonymous

  I am trying to copy a large amount (about 50 GB) of data over my network from a Hyper-V-hosted virtual machine running Ubuntu 11.04 (Natty Narwhal) to another (non-virtual) Ubuntu host that I plan to use for testing upgrades to one of our web applications. The problem I am having is with the virtual machine, which I shall refer to in what follows as "source.host". This machine is running 64-bit Ubuntu Server with the 2.6.38-8-server kernel and the Microsoft Linux Integration Components for Hyper-V kernel modules (hv_utils, hv_timesource, hv_netvsc, hv_blkvsc, hv_storvsc, and hv_vmbus) loaded. It uses a Hyper-V "synthetic network adapter" for its networking interface. To do the copy, I log on to the machine with the data and run the following commands (Call the remote machine "destination.host".): $ cd /path/to/data $ tar -cvf - datafolder/ | ssh [email protected] "cat > ~/data.tar" This runs for a while and then suddenly stops after transferring somewhere from 2-6 GB. The terminal on the source.host machine displays a Write failed: broken pipe error. The odd part is this: after this occurs, the "source.host" machine is no longer able to talk to the rest of the network. I cannot ping any other hosts on the network from the "source.host" machine, and I cannot ping the "source.host" machine from any other host on the network. I am equally unable to access the any of the web services hosted on "source.host". Running ifconfig on "source.host" shows the network adapter to be up and running as usual with the correct IP address and everything. I tried restarting the networking service with $ /etc/init.d/networking restart but the problem does not go away. Restarting the machine makes it capable of talking to the network again -- it can ping and be pinged by other hosts, and the web services are also accessible and usable as normal -- but attempting the copy operation again results in the same failure, requiring another restart. As an experiment, I tried replacing the tar -- ssh pipeline above with a straight scp: $ scp -r datafolder/ [email protected]:~ but to no avail Thinking that the issue might have to do with the kernel packet-send buffers filling up, I tried increasing the buffer size to 12 MB (up from the 128 KB default) with # echo 12582911 > /proc/sys/net/core/wmem_max but this also had no effect. I'm guessing at this point that it might be a problem with the Microsoft synthetic network driver, but I don't really know. Does anyone have any suggestions? Thank you very much in advance!

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