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• Install 64-bit Ubuntu or 32-bit?

  - by nitbuntu

  I'll be receiving a new notebook in a few days and was planning on running Ubuntu on it as it's compatible and the notebook has no OS pre-installed. The specifications are: Core 2 Duo, T6600, 4 GB RAM, Intel integrated graphics. I know a year or two ago, running a 64-bit version of Ubuntu was not advised due to much of the applications and plugins (e.g. Flash) only running on 32-bit. Is this still the case? Would I get better performance with 64-bit Ubuntu since I have 4 GB of RAM? Are there any downsides anymore?

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• MySQL - Why would SHOW SLAVE HOSTS cause a binlog dump?

  - by Rory McCann

  We're getting loads of binlog files in our MySQL 5.0.x. We have a normal master/slave replication thing going with 1 master, 1 slave. Looking at /var/log/mysql.log, nearly 90% of the time the replicator connects and does a SHOW SLAVE HOSTS causes a bin log dump. For example: 7020 Query SHOW SLAVE HOSTS 7020 Binlog Dump Log: 'mysql-bin.029634' Pos: 13273 However when I do a SHOW SLAVE HOSTS on the mysql myself, I get no results. Occasionally when the replicator does a SHOW SLAVE HOSTS, mysql will hang for hours. I see nothing in the /var/log/syslog at the same time... What's going on here? How can I debug this more? For the record the MySQL master and slave servers are ubuntu dapper.

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• "File" exists or not

  - by SnailTang

  ls -il ls: cannot access éaj/p+st.ó·e: No such file or directory ls: cannot access éaj/p+st.ó·e: No such file or directory ls: cannot access é@j/p¦ft.¦·N: No such file or directory ls: cannot access é@j/p¦ft.¦·N: No such file or directory total 55456 ? -????????? ? ? ? ? ? éaj/p+st.ó·e ? -????????? ? ? ? ? ? éaj/p+st.ó·e ? -????????? ? ? ? ? ? é@j/p¦ft.¦·N ? -????????? ? ? ? ? ? é@j/p¦ft.¦·N and when i use to show these files, i get the info: p+st.ó·e p¦ft.¦·N Please, where do these files or somethings others exist. Or what makes them show here.

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• Using an allowed user list with VSFTPD

  - by Naftuli Tzvi Kay

  According to the Wiki here, you can only allow certain users to log in over FTP using the following configuration in your /etc/vsftp.conf file: userlist_enable=YES userlist_file=/etc/vsftp.user_list userlist_deny=NO I've configured my system to use this configuration, and I only have one user which I'd like to expose over FTP named streams, so my /etc/vsftp.user_list looks like this: streams Interestingly enough, I cannot log in once I enable to user list. If I change userlist_enable to NO, then things work properly, but if I enable it, I can't log in all, it just keeps trying to reconnect. I don't get a login failed message, it just keeps trying to reconnect when using lftp. My /etc/vsftp.conf file is available on Pastebin here and my /etc/vsftp.user_list is available here. What am I doing wrong here? I'd just like to only make the streams user able to log in.

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• Apache directory structure with multiple hosted languages.

  - by anomareh

  I just got a new work machine up and running and I'm trying to decide on how to set everything up directory wise. I've done some digging around and really haven't been able to find anything conclusive. I know it's a question with a variety of answers but I'm hoping there's some sort of general guidelines or best practices to go by. With that said, here are a few things specific to my situation. I will be doing actual development and testing on the same machine as the server. It is a single user machine in the sense that I will be the only one working on the machine. There will be multiple hosted languages, specifically PHP and RoR while possibly expanding later. I'd like the setup to translate well to a production environment. With those 3 things in mind there are a couple of things I've had in the back of mind. Seeing as it's a single user machine I haven't been able to decide whether or not I should be working on things out of my home directory or if they should be located outside of it. I'm feeling that outside of a user directory would be better as it would translate better to a production environment, but I'm also not sure if that will come with any permission annoyances or concerns seeing as I'll be working on the same machine. Hosting multiple languages seems like it may be a bit quirky. With PHP I've found you're generally just dumping the project somewhere in the document root where as something like a Rails app you have the entire project and you only want the public directory in the document root. Thanks for any insight, opinion, or just personal preference from experience anyone can offer.

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• Cron Tips for not running cron jobs on holidays (the monday of a three day weekend)

  - by Poul

  We have about a one hundred machine set-up with each machine running cron jobs like starting and stopping services and archiving these services' log files at the end of the day to a centralized repository. One headache we have is the three-day weekend (we're closed on holidays). We don't want the services starting up on those days and connecting to our business partner's machines. We currently do this by manually commenting out the most critical jobs and letting a bunch of errors happen all day. Not ideal. Basically if a job has '1-5' set in the day field we want this to mean 'work days' and not Monday to Friday'. We have a database that keeps track of which days are indeed 'work days' So, is it possible to override Cron's day-matching algorithm, or is there some other way to easily set a cron setting to avoid things starting up on a Monday holiday? Thanks!

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• Explanation for kernel error - Eeeek! page_mapcount went negative

  - by Aditya Advani

  Internet says this is a genuine Kernel Bug but does anyone know what triggers it?? Server running CentOS x86_64 with kernel 2.6.27.24 Here is my crash output: [root@u15345757 httpdocs]# Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.506380] Eeek! page_mapcount(page) went negative! (-1) Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.517515] page pfn = d0a3 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.523814] page->flags = 10000000000083c Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.532489] page->count = 2 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.538741] page->mapping = ffff88001f01a110 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.547924] vma->vm_ops = 0x0 Message from syslogd@ at Thu Aug 6 01:42:22 2009 ... u15345757 kernel: [1145736.554543] [ cut here ] Message from syslogd@ at Thu Aug 6 01:42:23 2009 ... u15345757 kernel: [1145736.564528] invalid opcode: 0000 [1] SMP Message from syslogd@ at Thu Aug 6 01:42:23 2009 ... u15345757 kernel: [1145736.564528] Code: 80 e8 22 51 fd ff 48 8b 85 90 00 00 00 48 85 c0 74 19 48 8b 40 20 48 85 c0 74 10 48 8b 70 58 48 c7 c7 10 7f 7d 80 e8 fd 50 fd ff <0f> 0b eb fe 8b 77 18 41 58 5b 5d 83 e6 01 f7 de 83 c6 04 e9 df Broadcast message from root (pts/3) (Thu Aug 6 01:49:29 2009): The system is going down for reboot NOW!

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• Backing up VMs to a tape drive

  - by Aljoscha Vollmerhaus

  I've got myself one of these fancy tape drives, HP LTO2 with 200/400 GB cartridges. The st driver reports it like this: scsi 1:0:0:0: Sequential-Access HP Ultrium 2-SCSI T65D I can store and retrieve files like a charm using tar, both tar cf /dev/st0 somedirectory and tar xf /dev/st0 work flawless. However, what I really would like to backup are LVM LVs. They contain entire virtual machines with varying partition layouts, so using mount and tar is not an option. I've tried using something like dd if=/dev/VG/LV bs=64k of=/dev/st0 to achieve this, but there seem to be various problems associated with this approach. Firstly, I would like to be able to store more than 1 LV on a single tape. Now I guess I could seek to concatenate the data on the tape, but I think this would not work very well in an automated scenario with many different LVs of various sizes. Secondly, I would like to store a small XML file along with the raw data that contains some information about the VM contained in the LV. I could dump everything to a directory and tar it up - not very desirable, I would have to set aside huge amounts of scratch space. Is there an easier way to achieve this? Thirdly, from googling around it seems like it would be wise to use something like mbuffer when writing to the tape, to prevent what wikipedia calls "shoe-shining" the tape. However, I can't get anything useful done with mbuffer. The mbuffer man page suggests this for writing to a tape device: mbuffer -t -m 10M -p 80 -f -o $TAPE So I've tried this: dd if=/dev/VG/LV | mbuffer -t -m 10M -p 80 -f -d 64k -o /dev/st0 Note the added "-d 64k" to account for the 64k block size of the tape. However, reading data back from a tape written in this way never seems to yield any useful results - dd has been running for ages now, and managed to transfer only 361M of data from the tape. What's wrong here?

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• Monitor LSI 3ware raid controller on ESXi

  - by aseq

  This concerns a server that runs ESXi (v. 4.x or 5.x) installed on drives that are configured into a raid10 using an LSI 3ware 97050 raid controller. I would like to know if there is a way to monitor the LSI 3ware series of controllers, in particular the 9750, through ESXi. And to hopefully also run the monitoring daemon LSI provides. I know you can set up a cronjob to execute tw_cli through ssh on the ESXi server. However that's not really ideal. I am not using vcenter by the way. It would be nice to have more than just monitoring working, since the 3ware software has a very useful web client, besides tw_cli.

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• Where is xorg.conf in Ubuntu 10.04?

  - by Mikey.B

  Hi Guys, I'm in the middle of trying to setup dual monitors on ubuntu and would like to backup my xorg.conf... The documentation I've been thus far say to do the following: sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf_backup But I don't see the xorg.conf file anywhere... Am I missing something? Where is this located?

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• Why do I have untrusted certificates for Google, Yahoo, Mozilla and others?

  - by jackweirdy

  In the HTTPS/SSL section of chrome://chrome/settings, I see the following: What does this mean, and is there something wrong? I have a basic understanding of SSL/TLS - I'm not claiming to be completely familiar, but I'm fairly confident I know my way around it - but I don't understand why I have certificates installed on my machine specifically for these sites. From my understanding, I should have the certificates for Certificate Authorities, and any site I visit and use SSL/TLS should have a certificate signed by one of these trusted CAs for me to trust the site. My worry is that if someone has maliciously installed a certificate for these sites on my machine, they could perform a DNS spoofing attack (or a number of other attacks) to hijack my connection to my email account without me knowing, and as they've got the private counterpart to the certificate on my machine, decrypt the communication. NB: I'm also aware that CA certificates aren't just within Chromium and are used system wide as part of libssl - they're stored in /etc/ssl/certs. What I'd like to know is: Is this correct? - The big red boxes make me think no Is this malicious or benign? What can I do to resolve this problem? (If indeed it is a problem) Thanks :)

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• Getting Error while running RED5 server - class path resource [red5.xml] cannot be opened because it does not exist

  - by sunil221

  HI , I have installed java version "1.6.0_14" and Ant version 1.8.2 for red5 Server. when i am trying to run red5 server i am getting the following error please help Root: /usr/local/red5 Deploy type: bootstrap Logback selector: org.red5.logging.LoggingContextSelector Setting default logging context: default 11:27:39.838 [main] INFO org.red5.server.Launcher - Red5 Server 1.0.0 RC1 $Rev: 4171 $ (http://code.google.com/p/red5/) Red5 Server 1.0.0 RC1 $Rev: 4171 $ (http://code.google.com/p/red5/) SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/usr/local/red5/red5.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/usr/local/red5/lib/logback-classic-0.9.26.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. 11:27:39.994 [main] INFO o.s.c.s.FileSystemXmlApplicationContext - Refreshing org.springframework.context.support.FileSystemXmlApplicationContext@39d85f79: startup date [Mon Dec 21 11:27:39 EST 2009]; root of context hierarchy 11:27:40.149 [main] INFO o.s.b.f.xml.XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [red5.xml] Exception org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [red5.xml]; nested exception is java.io.FileNotFoundException: class path resource [red5.xml] cannot be opened because it does not exist Bootstrap complete

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• TIME_WAIT connections not being cleaned up after timeout period expires

  - by Mark Dawson

  I am stress testing one of my servers by hitting it with a constant stream of new network connections, the tcp_fin_timeout is set to 60, so if I send a constant stream of something like 100 requests per second, I would expect to see a rolling average of 6000 (60 * 100) connections in a TIME_WAIT state, this is happening, but looking in netstat (using -o) to see the timers, I see connections like: TIME_WAIT timewait (0.00/0/0) where their timeout has expired but the connection is still hanging around, I then eventually run out of connections. Anyone know why these connections don't get cleaned up? If I stop creating new connections they do eventually disappear but while I am constantly creating new connections they don't, seems like the kernel isn't getting chance to clean them up? Is there some other config options I need to set to remove the connections as soon as they have expired? The server is running Ubuntu and my web server is nginx. Also it has iptables with connection tracking, not sure if that would cause these TIME_WAIT connections to live on. Thanks Mark.

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• HAproxy - Redirect issue - Uri Variables ?

  - by Justin

  I'm using haproxy 1.5dev3 and I was wondering if there is any possible way to grab uri variables from a request to reappend the query on the end of a redirect url? What I'm trying to do is redirect from: http://www.domain.com/page/example.htm?id=1234567 to: http://www.domain.com/frame/newpage.cfm?id=1234567 redirect prefix doesn't work properly as it tries to append /page/example.htm to the end of the redirect url. Can I do some sort of rewrite to accomplish this? It would be awesome if you could use uri and queries as variables for redirection/pool selection like on F5. Please help...Thanks!

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• Virtual host “Forbidden You don't have permission to access / on this server” on debian

  - by ulduz114

  Before I created a virtual host I could see "http://localhost", but when I created a virtual host I could not see "http://localhost" and my virtual host "http://test" Here is my virtualhost config file: <VirtualHost test:80> ServerAdmin [email protected] ServerName test ServerAlias test DocumentRoot "/home/javad/Public/test/public" <Directory "/home/javad/Public/test/public/" > Options Indexes FollowSymLinks MultiViews ExecCGI DirectoryIndex index.php AllowOverride all Order allow,deny allow from all </Directory> </VirtualHost> so I ran a2ensite test and added 127.0.0.1 test to /etc/hosts file and restart apapche2 fine But after that I cannot access to http://test or even http://localhost i get Forbidden You don't have permission to access / on this server. When I delete my virtual host setting I can access http://localhost

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• IP tables gateway

  - by WojonsTech

  I am trying to make an iptables gateway. I ordered 3 dedicated server from my hosting company all with dual nics. One server has been given all the ip addresses and is connected directly to the internet and has its other nic connected to a switch where the other servers are all connected also. I want to setup iptables so for example the ip address 50.0.2.4 comes into my gateway server it fowards all the traffic to a private ip address using the second nic. This way the second nic can do what ever it needs and can respond back also. I also want it setup that if any of the other servers needs to download anything over the inernet it is able to do so and by using the same ip address that is used for its incomming traffic. Lastly I would like to be able to setup dns and other needed networking stuff that i maybe not thinking about.

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• How to tell X.org to reload input device module? (Working around suspend-to-ram crash on Acer laptop

  - by Vi

  When X.org boots up, Synaptics touchpad works well. But when I remove the module it falls back to /dev/input/mice and don't use normal driver even when touchpad is available again. Xorg.0.log: ... (II) XINPUT: Adding extended input device "Synaptics Touchpad" (type: TOUCHPAD) (--) Synaptics Touchpad: touchpad found # { rmmod psmouse && echo mem /sys/power/state && modprobe psmouse; } (WW) : No Device specified, looking for one... (II) : Setting Device option to "/dev/input/mice" ... How to tell X.org to try it's InputDevice again (without restarting X server)? P.S. rmmod psmouse is needed to prevent crashing of Acer Extensa 5220 when resuming from suspend-to-ram. Update: Found answer myself: Doing xinput set-int-prop "Synaptics Touchpad" "Device Enabled" 8 1 after reloading the kernel module reloads touchpad. Now suspend-to-ram works OK.

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• Varnish "FetchError no backend connection" error

  - by clueless-anon

  Varnishlog: 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829925 1.0 12 SessionOpen c 79.124.74.11 3063 :80 12 SessionClose c EOF 12 StatSess c 79.124.74.11 3063 0 1 0 0 0 0 0 0 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829928 1.0 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829931 1.0 12 SessionOpen c 108.62.115.226 46211 :80 12 ReqStart c 108.62.115.226 46211 467185881 12 RxRequest c GET 12 RxURL c / 12 RxProtocol c HTTP/1.0 12 RxHeader c User-Agent: Pingdom.com_bot_version_1.4_(http://www.pingdom.com/) 12 RxHeader c Host: www.mysite.com 12 VCL_call c recv lookup 12 VCL_call c hash 12 Hash c / 12 Hash c www.mysite.com 12 VCL_return c hash 12 VCL_call c miss fetch 12 FetchError c no backend connection 12 VCL_call c error deliver 12 VCL_call c deliver deliver 12 TxProtocol c HTTP/1.1 12 TxStatus c 503 12 TxResponse c Service Unavailable 12 TxHeader c Server: Varnish 12 TxHeader c Content-Type: text/html; charset=utf-8 12 TxHeader c Retry-After: 5 12 TxHeader c Content-Length: 418 12 TxHeader c Accept-Ranges: bytes 12 TxHeader c Date: Wed, 27 Jun 2012 20:45:31 GMT 12 TxHeader c X-Varnish: 467185881 12 TxHeader c Age: 1 12 TxHeader c Via: 1.1 varnish 12 TxHeader c Connection: close 12 Length c 418 12 ReqEnd c 467185881 1340829931.192433119 1340829931.891024113 0.000051022 0.698516846 0.000074035 12 SessionClose c error 12 StatSess c 108.62.115.226 46211 1 1 1 0 0 0 256 418 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829934 1.0 0 CLI - Rd ping 0 CLI - Wr 200 19 PONG 1340829937 1.0 netstat -tlnp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 3086/nginx tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1915/varnishd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1279/sshd tcp 0 0 127.0.0.2:25 0.0.0.0:* LISTEN 3195/sendmail: MTA: tcp 0 0 127.0.0.2:6082 0.0.0.0:* LISTEN 1914/varnishd tcp 0 0 127.0.0.2:9000 0.0.0.0:* LISTEN 1317/php-fpm.conf) tcp 0 0 127.0.0.2:3306 0.0.0.0:* LISTEN 1192/mysqld tcp 0 0 127.0.0.2:587 0.0.0.0:* LISTEN 3195/sendmail: MTA: tcp 0 0 127.0.0.2:11211 0.0.0.0:* LISTEN 3072/memcached tcp6 0 0 :::8080 :::* LISTEN 3086/nginx tcp6 0 0 :::80 :::* LISTEN 1915/varnishd tcp6 0 0 :::22 :::* LISTEN 1279/sshd /etc/nginx/site-enabled/default server { listen 8080; ## listen for ipv4; this line is default and implied listen [::]:8080 default ipv6only=on; ## listen for ipv6 root /usr/share/nginx/www; index index.html index.htm index.php; # Make site accessible from http://localhost/ server_name localhost; location / { # First attempt to serve request as file, then # as directory, then fall back to index.html try_files $uri $uri/ /index.html; } location /doc { root /usr/share; autoindex on; allow 127.0.0.2; deny all; } location /images { root /usr/share; autoindex off; } #error_page 404 /404.html; # redirect server error pages to the static page /50x.html # #error_page 500 502 503 504 /50x.html; #location = /50x.html { # root /usr/share/nginx/www; #} # proxy the PHP scripts to Apache listening on 127.0.0.1:80 # #location ~ \.php$ { # proxy_pass http://127.0.0.1; #} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # location ~ \.php$ { fastcgi_pass 127.0.0.2:9000; fastcgi_index index.php; include fastcgi_params; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # #location ~ /\.ht { # deny all; #} } /etc/nginx/sites-enabled/www.mysite.com.vhost server { listen 8080; server_name www.mysite.com mysite.com.net; root /var/www/www.mysite.com/web; if ($http_host != "www.mysite.com") { rewrite ^ http://www.mysite.com$request_uri permanent; } index index.php index.html; location = /favicon.ico { log_not_found off; access_log off; } location = /robots.txt { allow all; log_not_found off; access_log off; } # Deny all attempts to access hidden files such as .htaccess, .htpasswd, .DS_Store (Mac). location ~ /\. { deny all; access_log off; log_not_found off; } location / { try_files $uri $uri/ /index.php?$args; } # Add trailing slash to */wp-admin requests. rewrite /wp-admin$ $scheme://$host$uri/ permanent; location ~* \.(jpg|jpeg|png|gif|css|js|ico)$ { expires max; log_not_found off; } location ~ \.php$ { try_files $uri =404; include /etc/nginx/fastcgi_params; fastcgi_pass 127.0.0.2:9000; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } include /var/www/www.mysite.com/web/nginx.conf; location ~ /nginx.conf { deny all; access_log off; log_not_found off; } } /etc/varnish/default.vcl # This is a basic VCL configuration file for varnish. See the vcl(7) # man page for details on VCL syntax and semantics. # # Default backend definition. Set this to point to your content # server. # backend default { .host = "127.0.0.2"; .port = "8080"; # .connect_timeout = 600s; #.first_byte_timeout = 600s; # .between_bytes_timeout = 600s; # .max_connections = 800; Note: uncommenting the last four options at default.vcl made no difference. cat /etc/default/varnish # Configuration file for varnish # # /etc/init.d/varnish expects the variables $DAEMON_OPTS, $NFILES and $MEMLOCK # to be set from this shell script fragment. # # Should we start varnishd at boot? Set to "yes" to enable. START=yes # Maximum number of open files (for ulimit -n) NFILES=131072 # Maximum locked memory size (for ulimit -l) # Used for locking the shared memory log in memory. If you increase log size, # you need to increase this number as well MEMLOCK=82000 # Default varnish instance name is the local nodename. Can be overridden with # the -n switch, to have more instances on a single server. INSTANCE=$(uname -n) # This file contains 4 alternatives, please use only one. ## Alternative 1, Minimal configuration, no VCL # # Listen on port 6081, administration on localhost:6082, and forward to # content server on localhost:8080. Use a 1GB fixed-size cache file. # # DAEMON_OPTS="-a :6081 \ # -T localhost:6082 \ # -b localhost:8080 \ # -u varnish -g varnish \ # -S /etc/varnish/secret \ # -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G" ## Alternative 2, Configuration with VCL # # Listen on port 6081, administration on localhost:6082, and forward to # one content server selected by the vcl file, based on the request. Use a 1GB # fixed-size cache file. # DAEMON_OPTS="-a :80 \ -T 127.0.0.2:6082 \ -f /etc/varnish/default.vcl \ -S /etc/varnish/secret \ -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G" If you need any other info let me know. I am all out of clue as to whats the problem.

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• Server high memory usage at same time every day

  - by Sam Parmenter

  Right, we moved one of our main sites onto a new AWS box with plenty of grunt as it would allow us more control that we had before and future proof ourselves. About a month ago we started running into issues with high memory usage at the same time every day. In the morning an export is run to export data to a file which is the FTPed to a local machine for processing. The issues were co-inciding with the rough time of the export but when we didn't run the export one day, the server still ran into the same issues. The export has been run at other times in the day since to monitor memory usage to see if it spikes. The conclusion is that the export is fine and barely touches the sides memory wise. No noticeable change in memory usage. When the issue happens, its effect is to kill mysql and require us to restart the process. We think it might be a mysql memory issue, but might just be that mysql is just the first to feel it. Looking at the logs there is no particular query run before the memory usage hits 90%. When it strikes at about 9:20am, the memory usage spikes from a near constant 25% to 98% and very quickly kills mysql to save itself. It usually takes about 3-4 minutes to die. There are no cron jobs running at that time of the day and we haven't noticed a spike in traffic over the period of the issues. Any help would be massively appreciated! thanks.

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• Yast sources for Suse EL 10.2

  - by lydonchandra

  Hi, I am using Suse EL 10.2 on IBM cloud, and need to install basic packages such as gcc, zlib, etc. Is there any official Suse 10 sources that I can use? Thanks

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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• changing ext4 journal data mode with remount?

  - by Amos Shapira

  I'm tweaking ext4 file system for speed, one tweak at a time. First tweak is to change from "data=ordered" to "data=writeback". To test this, I execute "mount -n -o remount,data=ordered /" but I keep getting "mount: / not mounted already, or bad option". From lots of google'ing I found many questions about similar problems and one answer circa 2001+ext3 which says that you can't change the journal mode with remount. Is this limitation still current?

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• open_basedir vs sessions

  - by liquorvicar

  On a virtual hosting server I have the open_basedir set to .:/path/to/vhost/web:/tmp:/usr/share/pear for each virtual host. I have a client who's running WordPress and he's complaining about open_basedir errors thus: PHP WARNING: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/var/lib/php/session/sess_42k7jn3vjenj43g3njorrnrmf2) is not within the allowed path(s): (.:/path/to/vhost/web:/tmp:/usr/share/pear) So the PHP session save_path isn't included in open_basedir but sessions across all sites on the server seems to be working fine apart from in this intermittent instance. I thought that perhaps the default session handler ignored open_basedir and this warning was caused by WP accessing the session file directly. However from what I can see PHP 5.2.4 introduced open_basedir checking to the session.save_path config: http://www.php.net/ChangeLog-5.php#5.2.4 (I am on PHP 5.2.13). Any ideas?

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• Accessing Netatalk/AFP Shares from OS X Snow Leopard

  - by j4nus_

  Recently upgraded Ubuntu home server from 8.04 client to 10.04 server and reinstalled all services therein. One of them is a Netatalk daemon that I configured in a fashion similar to this website: http://www.kremalicious.com/2008/06/ubuntu-as-mac-file-server-and-time-machine-volume/ Finder recognizes my server and the afp service, yet when I attempt to log in (using valid credentials), Finder indicates its the wrong username and password. I've tried altering some of the config files and my Google-fu to look for solutions, but no luck. Any tips? (This was not an issue under 8.04, if it matters)

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• Best practice for authenticating DMZ against AD in LAN

  - by Sergei

  We have few customer facing servers in DMZ that also have user accounts , all accounts are in shadow password file. I am trying to consolidate user logons and thinking about letting LAN users to authenticate against Active Directory.Services needing authentication are Apache, Proftpd and ssh. After consulting security team I have setup authentication DMZ that has LDAPS proxy that in turn contacts another LDAPS proxy (proxy2) in LAN and this one passes authentication info via LDAP (as LDAP bind) to AD controller.Second LDAP proxy only needed because AD server refuses speak TLS with our secure LDAP implemetation. This works for Apache using appropriate module.At a later stage I may try to move customer accounts from servers to LDAP proxy so they are not scattered around servers. For SSH I joined proxy2 to Windows domain so users can logon using their windows credentials.Then I created ssh keys and copied them to DMZ servers using ssh-copy, to enable passwordless logon once users are authenticated. Is this a good way to implement this kind of SSO?Did I miss any security issues here or maybe there is a better way ofachieving my goal?

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