How to change hostname for OpenVZ virtual server

vzctl set <CTID> --hostname <newhostname> --save

MySQL: fixing ‘MySQL server has gone away (error 2006)’ error

If you try to import / restore some big MySQL database you may have encountered such error:

MySQL server has gone away (error 2006)

To fix it you would need to increase wait_timeout and max_allowed_packet:

wait_timeout = 6000
max_allowed_packet = 128M

It should fix the problem.

if you need to send emails from your Postfix server using MX records instead of local delivery you should leave the following line empty:

mydestination = $myhostname, localhost.$mydomain, localhost

in /etc/postfix/main.cf.
This way:

mydestination =

And restart the server:

/etc/init.d/postfix restart