About all the things, but mainly Drupal, Ubuntu, CentOS and hosting

Sometimes you need to enable and place a Drupal 7 block in a seen region like header, content, footer, etc., and other times you need to disable it programmatically in a custom module. So to do it you just need to create two functions:
and
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In order to delegate a sub-domain's DNS management to another server, perform the following steps:
1. Set NS records for your subdomain and in DATA field put a nameserver:
2. Then create a new nameserver

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
so we had to change it back to:...

The recent versions of bind recommends the chroot environment for better security. When considering the most used popular Linux distribution ‘Red Hat’, they ship a package called ‘bind-chroot’ for the chrooting of bind. By default the bind or named daemon...