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• Database checksum features - redundant? useful?

  - by Eloff

  Just about every mainstream DB has a feature to calculate checksums per page, per sector, or per record. Now for a DB that does full recover after any crash, like PostgreSQL, is a checksum even useful? There will be no data loss as long as the xlog is ok, no matter what kind of corruption happened to the data itself, as the redo log is replayed every committed transaction will be restored. So checksums are useless on restore. Doesn't the filesystem or disk keep checksums anyway to detect corruption? So unless the checksum is per record, all it does is tell you there is corruption - which the OS should be yelling at you the minute you try to read it - so useless in operation? I can't imagine how a checksum can be helpful in any sane database - but since they all use them - I'd say that's just failure of imagination on my part. So how is it useful?

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• How do I keep my Mac from constantly going to sleep?

  - by David

  The system is a PowerPC Mac Mini running MacOS Tiger 10.4.11. When I login (I'm the admin), everything seems fine - until about 10-15 minutes later. Then the system goes into sleep mode. Each time I try to wake the system up - I can barely log in before it goes to sleep again. Sometimes I don't have enough time to enter my password (from the screen saver). If I shut down and restart, then I have that 10-15 mins again - until it again goes to sleep. I checked the settings in the Displays and Energy System Prefs. I looked at Accounts and at Screen Saver System Prefs; no times seemed to be present. I've already reset the PROM and other things (as part of an earlier problem shooting session). If I don't log in at the desktop, things seem to be fine. Nothing in .profile, /etc/profile, or /etc/bashrc seems to stand out. Right now, the system is hardly usable; can someone help? Many thanks...

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• How do I keep my Mac from constantly going to sleep?

  - by David

  The system is a PowerPC Mac Mini running MacOS Tiger 10.4.11. When I login (I'm the admin), everything seems fine - until about 10-15 minutes later. Then the system goes into sleep mode. Each time I try to wake the system up - I can barely log in before it goes to sleep again. Sometimes I don't have enough time to enter my password (from the screen saver). If I shut down and restart, then I have that 10-15 mins again - until it again goes to sleep. I checked the settings in the Displays and Energy System Prefs. I looked at Accounts and at Screen Saver System Prefs; no times seemed to be present. I've already reset the PROM and other things (as part of an earlier problem shooting session). If I don't log in at the desktop, things seem to be fine. Nothing in .profile, /etc/profile, or /etc/bashrc seems to stand out. Right now, the system is hardly usable; can someone help? Many thanks...

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• Munin graphing by CGI

  - by Vaughn Hawk

  I have Munin working just fine, but any time I try to do cgi graphing - it just stops graphing... no errors in the log, nothing. I've followed the instructions here: http://munin-monitoring.org/wiki/CgiHowto - and it should be working - here's my munin.conf setup, at least the parts that matter: dbdir /var/lib/munin htmldir /var/www/munin logdir /var/log/munin rundir /var/run/munin tmpldir /etc/munin/templates graph_strategy cgi cgiurl /usr/lib/cgi-bin cgiurl_graph /cgi-bin/munin-cgi-graph And then the host info yada yada - graph_strategy cgi and cgrurl are commented out in munin.conf - that's because if I uncomment them, graphing stops working. Again, I get no errors in logs, just blank images where the graphs used to be. Comment out cgi? As soon as munin html runs again, everything is back to normal. I'm running the latest version of munin and munin-node - I've tried fastcgi and regular cgi - permissions for all of the directories involved are munin:www-data - and my httpd.conf file looks like this: ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory /usr/lib/cgi-bin/> AllowOverride None SetHandler fastcgi-script Options ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> <Location /cgi-bin/munin-cgi-graph> SetHandler fastcgi-script </Location> Does anyone have any ideas? Without this working, at least from what I understand, Munin just graphs stuff, even if no one is looking at them - you add 100 servers to graph, and this starts to become a problem. Hope someone has ran into this and can help me out. Thanks!

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• How do I make Nginx redirect all requests for files which do not exist to a single php file?

  - by Richard

  I have the following nginx vhost config: server { listen 80 default_server; access_log /path/to/site/dir/logs/access.log; error_log /path/to/site/dir/logs/error.log; root /path/to/site/dir/webroot; index index.php index.html; try_files $uri /index.php; location ~ \.php$ { if (!-f $request_filename) { return 404; } fastcgi_pass localhost:9000; fastcgi_param SCRIPT_FILENAME /path/to/site/dir/webroot$fastcgi_script_name; include /path/to/nginx/conf/fastcgi_params; } } I want to redirect all requests that don't match files which exist to index.php. This works fine for most URIs at the moment, for example: example.com/asd example.com/asd/123/1.txt Neither of asd or asd/123/1.txt exist so they get redirected to index.php and that works fine. However, if I put in the url example.com/asd.php, it tries to look for asd.php and when it can't find it, it returns 404 instead of sending the request to index.php. Is there a way to get asd.php to be also sent to index.php if asd.php doesn't exist?

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• why sendmail resolves to ISP domain?

  - by digital illusion

  I wish to setup a local mail server for debugging purposes using fedora 15 I set up sendmail, but there is a problem. When I'm not connected to the internet, the local mail server delivers correctly (to localhost). And in /var/log/mail I see that I correctly delivered a mail to [email protected]: Jun 21 18:24:56 PowersourceII sendmail[6019]: p5LGOttt006019: [email protected], size=328, class=0, nrcpts=1, msgid=<[email protected]>, relay=adriano@localhost Jun 21 18:24:56 PowersourceII sendmail[6020]: p5LGOuSV006020: from=<[email protected]>, size=506, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA, relay=PowersourceII.localdomain [127.0.0.1] Jun 21 18:24:56 PowersourceII sendmail[6019]: p5LGOttt006019: [email protected], [email protected] (500/500), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=30328, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p5LGOuSV006020 Message accepted for delivery) When I connect, networkmanager fills in /etc/resolv.conf with: domain fastwebnet.it search fastwebnet.it localdomain nameserver 62.101.93.101 nameserver 83.103.25.250 Now sendmail does not work any longer and tries to send messages to my ISP domain, as seen in the log: Jun 21 18:40:02 PowersourceII sendmail[6348]: p5LGe1LV006348: [email protected], [email protected] (500/500), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=30327, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p5LGe10n006352 Message accepted for delivery) Jun 21 18:40:02 PowersourceII sendmail[6354]: p5LGe10n006352: to=<[email protected]>, delay=00:00:01, xdelay=00:00:00, mailer=esmtp, pri=120651, relay=mx3.fastwebnet.it. [85.18.95.21], dsn=5.1.1, stat=User unknown As you can see, it tries to deliver a mail to [email protected], and fails The setup is working under other ISPs. How can I avoid the fastweb ISP DNS relay? Thank you

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• Attempting to set up xampp and zend server on the same machine

  - by umbregachoong

  I am attempting to set up the zend server and xampp on the same machine but I am running into problems. I came across documentation on the zend site that said you cannot do this. However the folks over at apachefriends said you can. I have since discovered that I can run some of the zendframework examples within xampp by downloading the zendframework2 library and the skeleton app from git and I am doing this right now. However, I would like to know how to set them both up without having any conflicts both for the apache2 server and phpmyadmin. (One of the frustrating things is trying to load phpmyadmin in the deployment dialog by using the zpk tool in Zend). What I did in trying to set up both servers on windows 7 is as follows: First I have tried to set up the httpd conf files separately for each server, xampp running on port 8082 , and zend running on port 8088. At the time xampp would work, but zend server would not. This is after setting up the virtual host files separately for each server. Question 1: Where are the zend server error logs? Earlier, I was able to get both of them running configuring the xampp server httpd-conf file alone, however, I experienced problems with phpmyadmin even after configuring phpmyadmin on xampp to work on a different port other than 3306. Second question here: how to set up the two mysql phpmyadmin instances so they do not conflict with each other? Here is the xampp virtual host section: ##ServerAdmin [email protected] DocumentRoot "C:/xampp/htdocs/" ServerName localhost 8082 ##ServerAlias www.dummy-host.example.com ##ErrorLog "logs/dummy-host.example.com-error.log" ##CustomLog "logs/dummy-host.example.com-access.log" common Here is the zend virtual host section: DocumentRoot "C:\Program Files (x86)\Zend\Apache2/htdocs" ServerName localhost:8088 </VirtualHost> I have looked at this httpd.apache.org/docs/2.2/vhosts/ and this http://survivethedeepend.com/zendframeworkbook/en/1.0/creating.a.local.domain.using.apache.virtual.hosts but I am obviously doing something wrong here. I also have the java sdk running on this machine with tomcat and apache and I have no conflicts- too bad this is not the case for zend server and xampp Thanks umbre gachoong

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• Why is SSH finding remote keys for other accounts?

  - by Brian Pontarelli

  This is a strange issue I'm having with SSH from my Macbook Pro to a Linux (Ubuntu 11.10) server. I have a DSA key setup on the remote Linux server under my home directory like this: /home/me/.ssh/authorzied_keys I also have the same DSA key setup for a few other accounts on the machine named "foo" and "bar". I can log into all of the accounts fine without any password. Therefore, the DSA keys are all setup correctly. The strange behavior I'm seeing is when debugging the SSH connection. During the connection, the SSH debug is outputting this: debug2: key: /Users/me/.ssh/id_dsa (0x7f91a1424220) debug2: key: /home/foo/.ssh/id_dsa (0x7f91a1425620) debug2: key: /home/bar/.ssh/id_rsa (0x7f91a1425c60) debug2: key: /Users/me/.ssh/id_rsa (0x0) This is strange for so many reasons, but essentially, why is SSH listing out keys on the server (/home/foo/.ssh/id_dsa and /home/bar/.ssh/id_rsa)? These files don't even exist on the server, so why are they listed? I'm not logging into the "foo" or "bar" accounts, so why is SSH even listing those? On my Macbook Pro, I only have a DSA key, but SSH is listing out an RSA key, what's that all about? Another user on the server doesn't get any of these messages when they log in and they have the exact same setup for their DSA key and the exact same Macbook Pro setup as mine? Does anyone know what these messages are and why SSH is outputting them?

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• tomcat start service NoClassDefFoundError?

  - by mobibob

  I am trying to redeploy my server on a new server with a different DNS and IP address. Therefore, I think my problem is in the configuration to find JAR files. Is there a way to get more detail as to which class is being requested so I can narrow down my problem. Does anyone have any suggested troubleshooting guidance for such problem? BTW - the configuration was working on the original server, and I tried to find all the locations in the files: conf/, worker.properties, server.xml, catalina.policy, web.xml. The jarkarta.log repeats the starting... error initializing ... forever. Very boring, therefore, the problem has to be fundamental. Apparently, the error message is recorded in the log across more than one line and would be this: Error occurred during initialization of VM java/lang/NoClassDefFoundError : java/lang/Object [2012-05-21 18:20:33] [info] Procrun (2.0.4.0) started [2012-05-21 18:20:33] [info] Running Service... [2012-05-21 18:20:33] [info] Starting service... [2012-05-21 18:20:33] [info] Error occurred during initialization of VM [2012-05-21 18:20:33] [info] java/lang/NoClassDefFoundError [2012-05-21 18:20:33] [info] : java/lang/Object [2012-05-21 18:21:59] [info] Procrun (2.0.4.0) started [2012-05-21 18:21:59] [info] Running Service... [2012-05-21 18:21:59] [info] Starting service... [2012-05-21 18:21:59] [info] Error occurred during initialization of VM [2012-05-21 18:21:59] [info] java/lang/NoClassDefFoundError [2012-05-21 18:21:59] [info] : java/lang/Object [2012-05-21 18:35:16] [info] Procrun (2.0.4.0) started [2012-05-21 18:35:16] [info] Running Service... [2012-05-21 18:35:16] [info] Starting service... [2012-05-21 18:35:16] [info] Error occurred during initialization of VM [2012-05-21 18:35:16] [info] java/lang/NoClassDefFoundError [2012-05-21 18:35:16] [info] : java/lang/Object [2012-05-21 18:45:25] [info] Procrun (2.0.4.0) started [2012-05-21 18:45:25] [info] Running Service... [2012-05-21 18:45:25] [info] Starting service... [2012-05-21 18:45:25] [info] Error occurred during initialization of VM [2012-05-21 18:45:25] [info] java/lang/NoClassDefFoundError [2012-05-21 18:45:25] [info] : java/lang/Object [2012-05-21 18:46:29] [info] Procrun (2.0.4.0) started [2012-05-21 18:46:29] [info] Running Service... [2012-05-21 18:46:29] [info] Starting service... [2012-05-21 18:46:29] [info] Error occurred during initialization of VM [2012-05-21 18:46:29] [info] java/lang/NoClassDefFoundError

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• Fail2Ban adds iptable rules but they are not working?

  - by EApubs

  Fail2Ban just blocked my IP for 3 SSH attempts. It added the iptables rule and I can see it using the "sudo iptables -L -n" command. But I can still access the site and login through SSH! What might be the problem? Is it because im using CloudFlare? I have set Nginx to write the real IPs to the access logs instead of the Cloud Flare IP. Isn't it enough? Chain fail2ban-ssh (1 references) target prot opt source destination DROP all -- 119.235.14.8 0.0.0.0/0 RETURN all -- 0.0.0.0/0 0.0.0.0/0 The input chain : Chain INPUT (policy DROP) target prot opt source destination fail2ban-NoAuthFailures tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 fail2ban-nginx-dos tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 80,8090 fail2ban-postfix tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 25,465 fail2ban-ssh-ddos tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22 fail2ban-ssh tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 22 ufw-before-logging-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-before-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-after-logging-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-reject-input all -- 0.0.0.0/0 0.0.0.0/0 ufw-track-input all -- 0.0.0.0/0 0.0.0.0/0 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4

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• How can I recover my system after running 'mkfs' on the system partition?

  - by Filip Podgórny

  I am not a Linux user, and was doing some homework, I blindly typed sudo mkfs ext3 dev/sda2 (I had Ubuntu as Windows installation). I've done few more things, and turned Ubuntu off to switch on Windows back. No operating system installed - this is the message I'm getting. I plugged my HDD onto another computer and all my files are still there. What should I do to get my windows installation back? df -l (before mkfs) /dev/loop0 29G 2,0G 27G 8% / udev 3,0G 4,0K 3,0G 1% /dev tmpfs 1,2G 900K 1,2G 1% /run none 5,0M 0 5,0M 0% /run/lock none 3,0G 1,3M 3,0G 1% /run/shm /dev/sda3 455G 123G 333G 27% /host /dev/sdb1 1,9G 820M 1,1G 43% /media/PHONE CARD mkfs output (polish, sorry) mke2fs 1.41.14 (22-Dec-2010) Etykieta systemu plików= Typ OS: Linux Rozmiar bloku=1024 (log=0) Rozmiar fragmentu=1024 (log=0) Stride=0 bloków, szerokosc Stripe=0 bloków 25688 i-wezlów, 102400 bloków 5120 bloków (5.00%) zarezerwowanych dla superuzytkownika Pierwszy blok danych=1 Maksymalna liczba bloków systemu plików=67371008 13 grup bloków 8192 bloków w grupie, 8192 fragmentów w grupie 1976 i-wezlów w grupie Kopie zapasowe superbloku zapisane w blokach: 8193, 24577, 40961, 57345, 73729 Zapis tablicy i-wezlów: zakonczono Tworzenie kroniki (4096 bloków): wykonano Zapis superbloków i podsumowania systemu plików: wykonano Ten system plików bedzie automatycznie sprawdzany co kazde 30 montowan lub co 180 dni, zaleznie co nastapi pierwsze. Mozna to zmienic poprzez tune2fs -c lub -i.

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• OS X: Storing MySQL data securely, on an encrypted FileVault image using a soft link

  - by GJ

  I am trying to get a macports-installed MySQL to use a data directory stored inside my FileVault-protected home dir. I used sudo cp -a /opt/local/var/db/mysql5 ~/db/ (the -a to ensure file permissions remain intact) and then replaced the original mysql5 directory with a soft link: sudo ln -s ~/db/mysql5 /opt/local/var/db/mysql5 However, when I now try to start MySQL it fails. It follows the soft link at least to the extent that it modifies some files in the ~/db/mysql5 dir, notably the error log which gets appended to it this: 110108 15:33:08 mysqld_safe Starting mysqld daemon with databases from /opt/local/var/db/mysql5 110108 15:33:08 [Warning] '--skip-locking' is deprecated and will be removed in a future release. Please use '--skip-external-locking' instead. 110108 15:33:08 [Warning] '--log_slow_queries' is deprecated and will be removed in a future release. Please use ''--slow_query_log'/'--slow_query_log_file'' instead. 110108 15:33:08 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead. 110108 15:33:08 [Warning] Setting lower_case_table_names=2 because file system for /opt/local/var/db/mysql5/ is case insensitive 110108 15:33:08 [Note] Plugin 'FEDERATED' is disabled. 110108 15:33:08 [Note] Plugin 'ndbcluster' is disabled. /opt/local/libexec/mysqld: Table 'mysql.plugin' doesn't exist 110108 15:33:08 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 110108 15:33:09 InnoDB: Started; log sequence number 4 1596664332 110108 15:33:09 [ERROR] /opt/local/libexec/mysqld: Can't create/write to file '/opt/local/var/db/mysql5/mac.local.pid' (Errcode: 13) 110108 15:33:09 [ERROR] Can't start server: can't create PID file: Permission denied 110108 15:33:09 mysqld_safe mysqld from pid file /opt/local/var/db/mysql5/gPod.local.pid ended I can't see why MySQL can't create the pid file, since manually creating it using the _mysql user succeeds (sudo -u _mysql touch mac.local.pid from inside ~/db/mysql5) Any ideas how to resolve this?

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• CentOS iscsi initiator has session but there is no block device

  - by jcalfee314

  I have installed the scsi-target-utils package on CentOS and I used it to perform a discovery. The discovery did give me an active session. I restarted the iscsi service but I do not see any new devices (fdisk -l). I see in /var/log/messages that my connection is operational now. I'm not sure how to debug this further. Can someone direct me into fixing this? discovery: iscsiadm -m discovery -t sendtargets -p 192.168.0.155 returns: 192.168.0.155:3260,-1 iqn.2009-02.com.twinstrata:cloudarray:sn-1d07c1b62d4ec8f3 Just to verify it actually worked: iscsiadm -m session returns tcp: [1] 192.168.0.155:3260,1 iqn.2009-02.com.twinstrata:cloudarray:sn-1d07c1b62d4ec8f3 restarting as the directions say to do: service iscsi restart output written to /var/log/message Stopping iscsi: Sep 20 12:14:22 localhost kernel: connection1:0: detected conn error (1020) [ OK ] Starting iscsi: Sep 20 12:14:22 localhost kernel: scsi1 : iSCSI Initiator over TCP/IP Sep 20 12:14:22 localhost iscsid: Connection1:0 to [target: iqn.2009-02.com.twinstrata:cloudarray:sn-1d07c1b62d4ec8f3, portal: 192.168.0.155,3260] through [iface: default] is shutdown. Sep 20 12:14:22 localhost iscsid: Could not set session2 priority. READ/WRITE throughout and latency could be affected. [ OK ] [root@db iscsi]# Sep 20 12:14:23 localhost iscsid: Connection2:0 to [target: iqn.2009-02.com.twinstrata:cloudarray:sn-1d07c1b62d4ec8f3, portal: 192.168.0.155,3260] through [iface: default] is operational now Ran a login command: iscsiadm -m node -T iqn.2009-02.com.twinstrata:cloudarray:sn-1d07c1b62d4ec8f3 -p 192.168.0.155 -l No errors, no logging occurred. Next I compared the output from "fdisk -l|egrep dev" both with the iscsi session and without. There is no difference. I suppose I could just look in /etc/mtab. Any ideas on how I can get an iscsi device?

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• Black Screen on Logon (windows 7 home premium)

  - by Blacknight334

  i have been having some trouble with a dell Xps 15 laptop that i recently purchased. it is under a month old, and a problem has occurred, upon logging on just after start up, the computer will just sit on a black log on screen (with the mouse still visible and active) for a few minutes. it is extremely annoying, especially when im in a rush. the laptop is under a month old. So far, i have tried to update the drivers, all windows update, and still, nothing. also, it doesnt seem to do it when i log into safe mode, or if it does, it will do it for less than 10 seconds, then load the desktop (in normal boot, it usually takes a few minutes). i have also run a number of the inbuilt diagnostics, but found no errors. i want to avoid having to do a system restore for as long as i can. does anyone know anything that can help? (the laptop is running a 500gb SSD, 2gb Nvidia 640m, 8gb ram, 3rd gen i7 quad core with 8 threads) thanks.

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• Connection refused in ssh tunnel to apache forward proxy setup

  - by arkascha

  I am trying to setup a private forward proxy in a small server. I mean to use it during a conference to tunnel my internet access through an ssh tunnel to the proxy server. So I created a virtual host inside apache-2.2 running the proxy, the proxy_http and the proxy_connect module. I use this configuration: <VirtualHost localhost:8080> ServerAdmin xxxxxxxxxxxxxxxxxxxx ServerName yyyyyyyyyyyyyyyyyyyy ErrorLog /var/log/apache2/proxy-error_log CustomLog /var/log/apache2/proxy-access_log combined <IfModule mod_proxy.c> ProxyRequests On <Proxy *> # deny access to all IP addresses except localhost Order deny,allow Deny from all Allow from 127.0.0.1 </Proxy> # The following is my preference. Your mileage may vary. ProxyVia Block ## allow SSL proxy AllowCONNECT 443 </IfModule> </VirtualHost> After restarting apache I create a tunnel from client to server: #> ssh -L8080:localhost:8080 <server address> and try to access the internet through that tunnel: #> links -http-proxy localhost:8080 http://www.linux.org I would expect to see the requested page. Instead a get a "connection refused" error. In the shell holding open the ssh tunnel I get this: channel 3: open failed: connect failed: Connection refused Anyone got an idea why this connection is refused ?

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• How would I setup iMail to forward a user's mail to another service w/o leaving a copy locally?

  - by Scott Mayfield

  I have an iMail 2006 server installation in which I have a particular user that has several aliases that all point to a single user (me, for the record). I've been copying all of my mail to GMail and reading it there, but it annoys me that I have to go back weekly and log into my mail account on iMail and delete between 6 and 10 thousand copies of messages I've already received, in order to keep my mailbox from filling up (yes, I have it set with no quota, but I consider it bad form to just let the box grow indefinitely). I've got the copying setup via an inbound user rule, but I'm wondering how to accomplish a "copy and delete" rule. The manual isn't clear on what happens with multiple matching rules (will they be processed in order, or is it a first match situation?) and there isn't a means to combine multiple actions into a single rule. If I use the "forward" action, I THINK that it's going to screw up all the sender information once the mail reaches my GMail account and show it as coming from me instead of the original senders (can anyone confirm that this is accurate?) An easy answer would be to delete my user account entirely, replace it with an alias that maps to my GMail account, but then I would lose my ability to log into the system for admin duties. So that leads me to creating a second, lesser known account for admin use, but since it's a real account, sooner or later I'm going to get mail sent to it and I'll be back to the same situation of having a user account that doesn't get emptied periodically. I imagine I can set the quota to 0 MB to cause all incoming mail to my admin account to bounce, or setup an inbound rule to bounce everything, but this is starting to sound kludgy to me. Does anyone know of a more direct work around to copying a user's incoming mail to an outside server and then deleting the local copy w/o removing their account entirely? Or is this just wishful thinking? Thanks in advance. Scott

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• how to debug when xinetd says : got signal 17 (child exited)

  - by Faizan Shaik

  I am trying to start services vsftpd and sshd using xinetd. my config files are as follows. /etc/xinetd.conf defaults { instances = 60 log_type = FILE /var/log/xinetdlog log_on_success = HOST PID log_on_failure = HOST cps = 25 30 only_from = localhost } includedir /etc/xinetd.d /etc/xinetd.d/ftp service ftp { disable = no server = /usr/sbin/vsftpd server_args = -l user = root socket_type = stream protocol = tcp wait = no instances = 4 flags = REUSE nice = 10 log_on_success += DURATION HOST USERID only_from = 127.0.0.1 10.0.0.0/24 } /etc/xinetd.d/ssh service ssh { disable = no log_on_failure += USERID server = /usr/sbin/sshd user = root socket_type = stream protocol = tcp wait = no instances = 20 flags = REUSE only_from = 127.0.0.1 10.0.0.0/24 } Even though i've included only_from attribute, vsftp server as well as ssh server are refusing connection from localhost. while vsftp and ssh servers are working fine individually when i check with "service vsftpd start" and "service ssh start". when i did debug using "xinetd -d" throug terminal i got the output as 13/10/20@00:06:08: DEBUG: 3592 {cnf_start_services} Started service: ftp 13/10/20@00:06:08: DEBUG: 3592 {cnf_start_services} Started service: ssh 13/10/20@00:06:08: DEBUG: 3592 {cnf_start_services} mask_max = 8, services_started = 2 13/10/20@00:06:08: NOTICE: 3592 {main} xinetd Version 2.3.14 started with libwrap loadavg options compiled in. 13/10/20@00:06:08: NOTICE: 3592 {main} Started working: 2 available services 13/10/20@00:06:08: DEBUG: 3592 {main_loop} active_services = 2 13/10/20@00:06:16: DEBUG: 3592 {main_loop} select returned 1 13/10/20@00:06:16: DEBUG: 3592 {server_start} Starting service ftp 13/10/20@00:06:16: DEBUG: 3592 {main_loop} active_services = 2 13/10/20@00:06:16: DEBUG: 3607 {exec_server} duping 9 13/10/20@00:06:16: DEBUG: 3592 {main_loop} active_services = 2 13/10/20@00:06:16: DEBUG: 3592 {main_loop} select returned 1 13/10/20@00:06:16: DEBUG: 3592 {check_pipe} Got signal 17 (Child exited) 13/10/20@00:06:16: DEBUG: 3592 {child_exit} waitpid returned = 3607 13/10/20@00:06:16: DEBUG: 3592 {server_end} ftp server 3607 exited 13/10/20@00:06:16: DEBUG: 3592 {svc_postmortem} Checking log size of ftp service 13/10/20@00:06:16: INFO: 3592 {conn_free} freeing connection 13/10/20@00:06:16: DEBUG: 3592 {child_exit} waitpid returned = -1 both services are getting started but neither of them is working. after banging for 3-4 hours i still don't have any clue about this error. Any help would be appreciated. thanks!

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• Using gitlab behind Apache proxy all generated urls are wrong

  - by Hippyjim

  I've set up Gitlab on Ubuntu 12.04 using the default package from https://about.gitlab.com/downloads/ {edit to clarify} I've set up Apache to proxy and run the nginx server the package installed on port 8888 (or so I thought). As I had Apache installed already I have to run nginx on localhost:8888. The problem is, all images (such as avatars) are now served from http://localhost:8888, and all the checkout urls Gitlab gives are also localhost - instead of using my domain name. If I change /etc/gitlab/gitlab.rb to use that url, then Gitlab stops working and gives a 503. Any ideas how I can tell Gitlab what URL to present to the world, even though it's really running on localhost? /etc/gitlab/gitlab.rb looks like: # Change the external_url to the address your users will type in their browser external_url 'http://my.local.domain' redis['port'] = 6379 postgresql['port'] = 2345 unicorn['port'] = 3456 and /opt/gitlab/embedded/conf/nginx.conf looks like: server { listen localhost:8888; server_name my.local.domain; [Update] It looks like nginx is still listening on the wrong port if I don't specify localhost:8888 as the external_url. I found this in /var/log/gitlab/nginx/error.log 2014/08/19 14:29:58 [emerg] 2526#0: bind() to 0.0.0.0:80 failed (98: Address already in use) 2014/08/19 14:29:58 [emerg] 2526#0: bind() to 0.0.0.0:80 failed (98: Address already in use) 2014/08/19 14:29:58 [emerg] 2526#0: bind() to 0.0.0.0:80 failed (98: Address already in use) 2014/08/19 14:29:58 [emerg] 2526#0: bind() to 0.0.0.0:80 failed (98: Address already in use) 2014/08/19 14:29:58 [emerg] 2526#0: bind() to 0.0.0.0:80 failed (98: Address already in use) 2014/08/19 14:29:58 [emerg] 2526#0: still could not bind() Apache setup looks like: <VirtualHost *:80> ServerName my.local.domain ServerSignature Off ProxyPreserveHost On AllowEncodedSlashes NoDecode <Location /> ProxyPass http://localhost:8888/ ProxyPassReverse http://127.0.0.1:8888 ProxyPassReverse http://my.local.domain </Location> </VirtualHost> Which seems to proxy everything back ok if Gitlab listens on localhost:8888 - I just need Gitlab to start displaying the right URL, instead of localhost:8888.

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• Apache taking up a lot of CPU while running request-tracker4

  - by bhowmik

  I am trying out a request-tracker installation on an EC2 micro instance. The specs for the micro instance are as follows 1) Ubuntu 12.04 64bit, 613MB RAM, 8GB Hard Drive 2) Running request-tracker 4.0.4 from the repository, perl 5.14.2, Apache2, MySQL5 3) Request-tracker4.0.4 running with mod_perl2 and Worker mpm 4) Apache configured with Worker MPM. Config snippet given below Timeout 150 KeepAlive On MaxKeepAliveRequests 60 KeepAliveTimeout 2 <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> Now when I start Apache2 it works fine for some time and after a while the CPU load shoots up to 99% or more. Usually it is one or more Apache processes doing this. I've tried a to modify the worker module configuration without any luck. The log files for both Apache2 and request-tracker4 are set to log debug messages and don't show anything to indicate what could be causing this. The system gets a maximum of 5 users at any given time and usually (90% of the time) it is just 2. I've just installed it and we only have 20 tickets in the database. I don't think its the memory thats causing the issue since the server isn't swapping or even close to it and I hardly see the memory usage go up. Would appreciate any pointers on how to go about troubleshooting this. In case it helps I've also tried this out a similar installation on a small instance (Identical settings except RAM bumped upto 1.7GB) and I still see the issue.

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• How would I setup iMail to forward a user's mail to another service w/o leaving a copy locally?

  - by Scott Mayfield

  I have an iMail 2006 server installation in which I have a particular user that has several aliases that all point to a single user (me, for the record). I've been copying all of my mail to GMail and reading it there, but it annoys me that I have to go back weekly and log into my mail account on iMail and delete between 6 and 10 thousand copies of messages I've already received, in order to keep my mailbox from filling up (yes, I have it set with no quota, but I consider it bad form to just let the box grow indefinitely). I've got the copying setup via an inbound user rule, but I'm wondering how to accomplish a "copy and delete" rule. The manual isn't clear on what happens with multiple matching rules (will they be processed in order, or is it a first match situation?) and there isn't a means to combine multiple actions into a single rule. If I use the "forward" action, I THINK that it's going to screw up all the sender information once the mail reaches my GMail account and show it as coming from me instead of the original senders (can anyone confirm that this is accurate?) An easy answer would be to delete my user account entirely, replace it with an alias that maps to my GMail account, but then I would lose my ability to log into the system for admin duties. So that leads me to creating a second, lesser known account for admin use, but since it's a real account, sooner or later I'm going to get mail sent to it and I'll be back to the same situation of having a user account that doesn't get emptied periodically. I imagine I can set the quota to 0 MB to cause all incoming mail to my admin account to bounce, or setup an inbound rule to bounce everything, but this is starting to sound kludgy to me. Does anyone know of a more direct work around to copying a user's incoming mail to an outside server and then deleting the local copy w/o removing their account entirely? Or is this just wishful thinking?

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• Apache ScriptAlias and access error?

  - by Parhs

  First of all after much pain i figured out how to make it work in Apache 2.4 windowz. Here is my configuration that seems to work successfully for git clone and push and everything. Problem First of all my configuration works. There is a "Require all denied" at / directory. I want only git functionality and nothing else. Example Request from a git client 192.168.100.252 - - [07/Oct/2012:04:44:51 +0300] "GET /git/simple/info/refs?service=git-upload-pack HTTP/1.1" 200 264` Error caused by that Request [Sun Oct 07 04:44:51.903334 2012] [authz_core:error] [pid 6988:tid 956] [client 192.168.100.252:13493] AH01630: client denied by server configuration: C:/git-server/web/simple There isnt any error at gitclient everything works fine but i get this at error log. Is there any solution for this error to not appear?I worry about log size. <VirtualHost *:80> DocumentRoot "C:\git-server\web" ServerName git.****censored**** DirectoryIndex index.php SetEnv GIT_PROJECT_ROOT c:/git-server/repositories SetEnv GIT_HTTP_EXPORT_ALL SetEnv REMOTE_USER=$REDIRECT_REMOTE_USER ScriptAlias /git/ "C:/Program Files (x86)/Git/libexec/git-core/git-http-backend.exe/" <LocationMatch "^/.*/git-receive-pack$"> Options +ExecCGI AuthType Basic AuthName intranet AuthUserFile "C:/git-server/config/users" Require valid-user </LocationMatch> <Directory /> Options All Require all denied </Directory> <Directory "C:\Program Files (x86)\Git\libexec\git-core"> Options +ExecCGI Options All Require all granted </Directory> </VirtualHost>

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• VSFTPD - FTP over TLS - Upload stops after exactly 82k?

  - by Redsandro

  I installed a VSFTP daemon on a CentOS server, using a RSA certificate for logging in using explicit TLS. Now, I cannot upload more than 82k. With files under that limit, there is no problem. The FTP works like a charm. But as soon as a file reaches 82k with FileZilla (81,952 bytes to be exact), the transfer will stop, and the FTP client hangs until time out is reached. FTP client console: 15:10:21 Command: STOR jquery-1.7.2.min.js 15:10:21 Response: 150 Ok to send data. 15:11:21 Error: Connection timed out 15:11:21 Error: File transfer failed after transferring 82 KB in 60 seconds /var/log/vsftpd.log FTP command: Client "x.x.x.x", "STOR jquery-1.7.2.min.js" FTP response: Client "x.x.x.x", "150 Ok to send data." OK UPLOAD: Client "x.x.x.x", "jquery-1.7.2.min.js", 81952 bytes, 1.32Kbyte/sec FTP response: Client "x.x.x.x", "226 File receive OK." // NOT okay, file is bigger // No mention of error here I cannot find relevant info about this problem, apart from a possible problem with trans_chunk_size (not mentioned in default config), but I tried different sizes and it has no impact on the problem. trans_chunk_size=4096 trans_chunk_size=8192 trans_chunk_size=9999 Ofcourse, after every configuration change, I restarted the server: /etc/init.d/vsftpd restart What else can cause this? It's not the latest version, but it's the latest update within the repositories that has been deemed fit for enterprise usage: Package info: $ yum info vsftpd Loaded plugins: fastestmirror Installed Packages Name : vsftpd Arch : x86_64 Version : 2.0.5 Release : 24.el5_8.1 Size : 286 k Repo : installed Summary : vsftpd - Very Secure Ftp Daemon URL : http://vsftpd.beasts.org/ License : GPL Description: vsftpd is a Very Secure FTP daemon. It was written completely from scratch.

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• Windows XP only loads in VGA mode, and crashes when raising resolution

  - by Harel

  My kid's computer (Windows XP, SP3) started to (what appears to be) crash on boot. It will only boot in Safe or VGA mode, and if I try to raise the resolution from 640x480 it just reboots itself, and a error appears in the Event Log. When it loads up not in VGA mode, the monitor shuts off just after the windows logo is shown. It seems like windows is actually running but I can't see anything on screen (monitor is off for lack of signal). Nothing was installed recently that I know of, short of the usual windows updates. Thanks, Harel Below is the event log error: Event Type: Error Event Source: System Error Event Category: (102) Event ID: 1003 Date: 15/04/2012 Time: 16:27:11 User: N/A Computer: ----- Description: Error code 1000008e, parameter1 c0000005, parameter2 f745b0bf, parameter3 ede24f98, parameter4 00000000. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 53 79 73 74 65 6d 20 45 System E 0008: 72 72 6f 72 20 20 45 72 rror Er 0010: 72 6f 72 20 63 6f 64 65 ror code 0018: 20 31 30 30 30 30 30 38 1000008 0020: 65 20 20 50 61 72 61 6d e Param 0028: 65 74 65 72 73 20 63 30 eters c0 0030: 30 30 30 30 30 35 2c 20 000005, 0038: 66 37 34 35 62 30 62 66 f745b0bf 0040: 2c 20 65 64 65 32 34 66 , ede24f 0048: 39 38 2c 20 30 30 30 30 98, 0000 0050: 30 30 30 30 0000

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• Microsoft SQL Server Management Studio causing system freeze

  - by CRoshanLG

  I'm experiencing very slow response from MSSMS and it causes other applications to slow down. Specially Skype crashes after few seconds from opening MSSMS, showing an error called "Disk I/O Error". I'm regularly using few applications (Sublime text, MS Word, Firefox, Outlook, Skype and one or two other apps) simultaneously. The system works fine when MSSMS is not in use! But as soon as MSSMS is opened, all the apps start to freeze (MSSMS also responds very slow). This problem has been there for about a week now (I haven't installed any apps or haven't made any changes to the system during that time). -- System Specifications -- Processor: Core i3 (3.1 GHz) RAM: 4 GB OS: Windows 7 Professional (64 bit) Free space in C drive: ~ 100 GB MS SQL Server 2008 R2 Microsoft SQL Server Management Studio version - 10.50.1600.1 I've tried to find a reason for this but there are no helpful information in the web! There are some solutions suggested (in forums and in Skype Support pages) for the Skypes' "Disk I/O Error", all of which I tried but does not solve the problem. Has anyone faced the same senario? (and hopefully) knows a solution? Systems Log I don't have much knowledge in interpreting the System Log, but I think the Critical and Warnings are not helpful. But there are lots of Error logs which might be useful. In source Kernal-General there are few similar errors saying "An I/O operation initiated by the Registry failed unrecoverably.The Registry could not flush hive (file): <some file>" In source atapi also there are few similar errors -- "The driver detected a controller error on \Device\Ide\IdePort0." (all errors has occurred in 'IdePort0') In Application Error, there are several errors logged, and following is the latest one. Both the Errors which has occurred today is similar (to this one). As it is from Ssms.exe, I guess this is relevant to the cause of problem. But as I said above I can't understand what it means!

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• pdo_mysql installation

  - by Arsenal

  Hello, On my server I'm trying to instal PHP Projekt (6). This requires pdo_mysql however. I thought this installation of pdo_mysql would be rather straightforward... I tried using pecl (pecl install pdo_mysql) after installing devel etc, but this came up with a permission denied error. I solved this by using directories that were accessible. It then came up with a cant run C compiled programs however. It also says to check config.log for more details but ironically config.log is automatically removed if the installation process fails... When I try to compile and output a "hello world".c however, it works perfectly. I then tried to download the pdo_mysql stuff and install in myself (using configure and make install). This seemed to do the job, but when I restarted my apache ... no sign of pdo_mysql anywhere even though I adjusted my php.ini file I have read somewhere that you need to recompile PHP with the option pdo_mysql enabled. But how does one do that (I'm using CentOS4). And isn't there any other way than that??? Thanks!

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