ubuntu

One of our Ubuntu servers stopped to show properly delivered messages in user inboxes after the last kernel update (Ubuntu precise (12.04.4 LTS)). Because for some reasons DEFAULT= and ORGMAIL= in /etc/procmailrc got replaced by

DEFAULT=/var/mail/$LOGNAME
ORGMAIL=/var/mail/$LOGNAME

so we had to change it back to:

DEFAULT=$HOME/Maildir/
ORGMAIL=$HOME/Maildir/

Now everything is working fine with the following settings for procmail:

root@quiethost:/etc# cat procmailrc
LOGFILE=/var/log/procmail.log

Running 'apt-get remove --purge apf-firewall' often times is not enough, especially if you tried to modify APF's files and paths. So to completely clean up your Ubuntu system form APF (Advanced Policy Firewall) your also need to run the following commands:

root@host:/etc/apt# rm -rf /var/lib/dpkg/info/apf*
root@host:/etc/apt# rm -rf /usr/src/apf*
root@host:/etc/apt# rm -rf /usr/share/man/man1/apf*
root@host:/etc/apt# rm -rf /usr/share/doc/apf*
root@host:/etc/apt# rm -rf /usr/local/sbin/apf
root@host:/etc/apt# rm -rf /usr/sbin/apf
root@host:/etc/apt# rm -rf /etc/rc0.d/K20apf*

XHProf profiler is developed by Facebook and open sourced in March 2009 under the Apache 2.0 license. XHProf is a function-level hierarchical profiler, with a PHP extension (written in C) to collect the raw data, and a few PHP scripts for the reporting/UI layer.

The easiest way to get it is via the PEAR installer (package home):

install php5-common
pear channel-update pear.php.net
pecl install xhprof

Once you have XHProf installed, you should enable it. Open your /etc/php5/conf.d/xhprof.ini and add

[xhprof]
extension=xhprof.so

After having your guest virtual machine up and running you might want to utilize one of the things that's very useful when using virtual machines - the ability to clone them.