Archive for the ‘cPanel/WHM’ Category

Remove CDP 2.0 cPanel integration

Sunday, June 19th, 2011

A handy feature of R1Soft CDP Server 2.0 (now known as Enterprise Edition) is that it can integrate with cPanel so that your users can restore their own files from your backups using a self service interface. If you want to remove this integration for any reason, then R1Soft provide a BASH shell script to do this for you:

/usr/lib/buagent/control-panels/cpanel/remove-cpanel-integration.sh

This script doesn’t always work for one reason or another, so the other way of doing this is to manually call the cPanel plugin uninstaller:

/usr/local/cpanel/bin/unregister_cpanelplugin /var/cpanel/registered_cpanelplugins/righteousbackup

This is particularly helpful if you forgot to uninstall the cPanel integration before upgrading to R1Soft CDP 3.0 or thought that the r1soft-uninstall-buagent utility would do it for you when removing the R1Soft CDP 2.0 agent (unfortunately it doesn’t, but it does helpfully remove the remove-cpanel-integration.sh script).

Unfortunately the cPanel integration in R1Soft CDP 3.0 is severely lacking compared to R1Soft CDP 2.0 and in my opinion is virtually useless in it’s current form.

As the control panel integration system is a pretty new feature in R1Soft CDP 3.0 (it was missing entirely from the initial release), hopefully it will be bolstered in subsequent R1Soft CDP 3.0 releases to restore it to the same level of functionality as was formerly available in R1Soft CDP 2.0.

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cPanel root partition space warning disabling operation of some features in WHM

Thursday, February 3rd, 2011

If you manage to accidentally fill up the root partition on your cPanel/WHM server, then WHM helpfully disables some features such as creating and terminating (deleting) accounts so that you don’t end up with half of an account. You will see a message something along the lines of this in WHM when attempting a restricted function:

The / partition on this server is running out of disk space. WHM operation has been temporarily suspended to prevent something bad from happening. Please ask your system admin to remove any files not in use on that partition.

Annoyingly, WHM doesn’t notice as soon as you free up some disk space, so not only can you not carry out some essential maintenance tasks until WHM next checks the free disk space but any of your customers with access to WHM (such as resellers) might come across this potentially embarrassing message!

cPanel stores a cache of it’s disk space calculation (basically the output of df) in “/root/.cpanel/datastore/_bin_df_-P_-k_-l” so you can either regenerate this file with the /usr/local/cpanel/bin/build_global_cache script, or alternatively just move/delete this file to get WHM back to normal operation.

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cPanel Native SSL support failed error

Friday, December 31st, 2010

If your cPanel/WHM install randomly sends you an e-mail one day along the lines of:

Native SSL support failed to pass the startup test. stunnel was started instead.
The exact error was: [linktest=/usr/local/cpanel/bin/linktest-ssl: error while loading shared libraries: /usr/local/cpanel/perl/Net/SSLeay/SSLeay.so: cannot open shared object file: No such file or directory
] [binary=/usr/local/cpanel/cpsrvd-ssl] [cpsrvd=/usr/local/cpanel/cpsrvd-ssl: error while loading shared libraries: /usr/local/cpanel/perl/Net/SSLeay/SSLeay.so: cannot open shared object file: No such file or directory
]

You should attempt run /usr/local/cpanel/bin/nativessl-install or submit a support request at https://tickets.cpanel.net/submit/

Then hopefully the following will restore it to it’s previous working state:

perl -MCPAN -e ‘install ExtUtils::Install’
/usr/local/cpanel/bin/nativessl-install

I have no idea what causes this or why /scripts/checkperlmodules doesn’t flag the ExtUtils::Install Perl module as missing, but it seems to fix the problem even when using perl588installer.tar.gz from layer1.cpanel.net to re-install the cPanel provided version of Perl and associated CPAN modules doesn’t.

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cPanel/WHM and yum-updatesd

Monday, March 15th, 2010

In my continuing fight with yum-updatesd, I found that on servers with cPanel/WHM installed it was crashing with mysterious Python errors:

root@tma03 [/etc/yum]# yum-updatesd –debug –no-fork
Traceback (most recent call last):
File “/usr/sbin/yum-updatesd”, line 35, in ?
import dbus
File “/usr/lib64/python2.4/site-packages/dbus/__init__.py”, line 1, in ?
from _dbus import *
File “/usr/lib64/python2.4/site-packages/dbus/_dbus.py”, line 48, in ?
from proxies import *
File “/usr/lib64/python2.4/site-packages/dbus/proxies.py”, line 2, in ?
import introspect_parser
File “/usr/lib64/python2.4/site-packages/dbus/introspect_parser.py”, line 1, in ?
import libxml2
File “/usr/lib64/python2.4/site-packages/libxml2.py”, line 215
pass
^
TabError: inconsistent use of tabs and spaces in indentation

In the end, I fixed this by forcing a re-install of the dbus-python and libxml2-python RPMs from the official CentOS mirrors. In my case, this was:

rpm –force -hUv http://mirrors.freethought-internet.co.uk/centos/5/os/x86_64/CentOS/dbus-python-0.70-7.el5.x86_64.rpm http://mirrors.freethought-internet.co.uk/centos/5/os/x86_64/CentOS/libxml2-python-2.6.26-2.1.2.8.x86_64.rpm

Adjust using your mirrors, distribution, version, architecture and RPM revision as appropriate.
Also, always remember to check for updates after manually re-installing RPMs from the OS repository.

I have no idea what cPanel/WHM does to break Python like this or if updates to cPanel are going to break yum-updatesd again in the future, but I have fixed this on several cPanel 11.25 boxes now!
I know cPanel likes to mess with system files, but these RPMs aren’t in the exclude list that the cPanel installer adds to /etc/yum.conf and forcing a re-installation of them seems to fix yum-updatesd.

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