October 31st, 2009 by tech
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If you don’t have a separate /tmp partition defined, you’re likely using cPanel’s tmpDSK method of setting up /tmp. By default, this “partition” is 512M in size, and for many that’s enough, but others need a larger /tmp.
So first, let’s edit /scripts/securetmp, and modify $tmpdsksize to increase the number of bytes this partition should have.
Once you’ve set the value for $tmpdsksize, save the file, and let’s see what processes are using /tmp.
lsof /tmp
Likely, you’ll see a few MySQL and Apache processes. Now we’ll stop these processes (and any others using /tmp) so that we can unmount it.
service httpd stop
service mysql stop
Then umount /tmp and /var/tmp:
umount -l /tmp
umount -l /var/tmp
Then remove the old tmpDSK:
rm -fv /usr/tmpDSK
Then create your new /tmp:
/scripts/securetmp
October 31st, 2009 by tech
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Quotas can be kind of a pain sometimes. If your accounts are showing 0 disk space used, be sure that you have enabled quotas in cPanel. Most people select this option during the initial cPanel configuration, but you can always enabled them later in WHM -> Initial Quota Setup. Once you’ve done that, let’s ensure that quotas are enabled on your partitions. You really only need them enabled on /home and /var. If you have a single partition, enable them on /.
If you needed to add usrquota to your /home partition, save your changes in /etc/fstab, and remount /home with
mount -o remount /home
Now we can run the following to repair the quotas:
/scripts/fixquotas
There are still plenty more ways that quotas can break, and dozens of errors associated with broken quotas, which I hope to go into deeper in the future.
October 31st, 2009 by tech
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Disabling DNS recursion is something most administrators will suggest, as having it enabled can cause performance issues.
vi /etc/named.conf
Then, in the options { section, add the following:
recursion no;
If recursion yes; is already there, just change it to recursion no; and restart named to activate your changes.
./scripts/restartsrv_named
October 31st, 2009 by tech
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Logwatch is very simple to install on CentOS boxen:
yum -y install logwatch
This will install logwatch and configure the daily logwatch cron in /etc/cron.daily. If you want to customize your logwatch configuration, you can edit /etc/logwatch/conf/logwatch.conf and modify settings like the email address the report is sent to, the verbosity of the report, what day you want logwatch to process, etc. A sample configuration is located at /usr/share/logwatch/default.conf/logwatch.conf
October 16th, 2009 by tech
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wget http://downloads.sourceforge.net/project/libssh2/libssh2-1.2.1.tar.gz?use_mirror=softlayer
tar -zxvf libssh2-0.12.tar.gz
cd libssh2-0.12
./configure && make all install
Run the pear installer for PECL/ssh2:
pear install ssh2
If this installing via pear fails,
wget http://pecl.php.net/get/ssh2-0.11.0.tgz
tar -zxvf ssh2-0.11.tgz
cd ssh2-0.11
phpize && ./configure --with-ssh2 && make
Copy ssh2.so to /usr/local/lib/php/extensions/no-debug-non-zts-20020429.
cp modules/ssh2.so /usr/local/lib/php/extensions/no-debug-non-zts-20020429
Add extension=ssh2.so to /usr/lib/php.ini
Run service restart httpd to enable these changes.
October 10th, 2009 by tech
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MySQL has a feature that allows you to log slow running queries to a file. To enable you just need to add some lines to your my.cnf file, and restart.
Insert the following into /etc/my.cnf:
log-slow-queries = /var/log/mysql/mysql-slow.log
long_query_time = 5
#touch /var/log/mysql/mysql-slow.log
#chown mysql:mysql /var/log/mysql/mysql-slow.log
#service mysql restart
October 4th, 2009 by tech
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From http://forums.cpanel.net/f43/account-based-email-login-problem-97109.html
root@servername [/home]# authtest -s imap test@normaldomain.info password
Authentication succeeded.
Authenticated: test@normaldomain.info (system username: normaldo)
Home Directory: /home/normaldo/mail/normaldomain.info/test
Maildir: /home/normaldo/mail/normaldomain.info/test
Quota: 262144000S
Encrypted Password: $1$KHntyoqN$wih5o0N7ZTf6Fm4vasrxj.
Cleartext Password: password
Options: (none)
FOR MY PROBLEMATIC DOMAIN:::
root@servername [/home]# authtest -s imap info@problemdomain.info password
Authentication FAILED: Operation not permitted
What you want to do next is check /usr/local/cpanel/logs/login_log to see what the exact issue is. In my circumstance, I received this error:
208.74.121.102 - info@jurnamakelaars.nl [10/04/2009:14:37:11 -0000] "POST /login/ HTTP/1.1" FAILED LOGIN webmaild: user password hash is missing from system (user probably does not exist)
I then checked the user’s shadow file in /home/USERNAME/etc/domain.com/shadow and saw that it was corrupt. I removed the file, created a new one, and applied user:mail permissions. I then created a new email account, then copied the user’s encrypted password after making entries in shadow for the existing users. I was then able to login to each webmail account without issue.
October 1st, 2009 by tech
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First thing — check /usr/local/cpanel/logs/login_log
If you see a line like:
208.74.121.102 - name@domain.com [10/01/2009:17:21:12 -0000] "POST
/login/ HTTP/1.1" FAILED LOGIN webmaild: user password hash is missing
from system (user probably does not exist)
Check /home/USER/etc/DOMAIN/shadow to make sure that the webmail user is listed there. If not, copy one of the lines, change the username, and reset the password via cPanel.
September 28th, 2009 by tech
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/usr/local/cpanel/bin/domain_keys_installer USERNAME
September 28th, 2009 by tech
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Fatal error: Call to undefined method Registry::hasInterface() in
/usr/local/cpanel/base/horde/config/prefs.php on line 134
If you are using the Turkish language in Horde, you may want to utilize English, if at all possible, due to a bug in PHP 5.2 which will not be resolved until PHP 6.
http://bugs.php.net/bug.php?id=35050
