If you need to test router configuration, prepare a small lab, or just learn something new then download and use GNS3.
Get rid of slow CentOS mirrors on update.
If you are using ISPConfig on CentOS and don’t want to bother with self compiled postfix (because of MySQL support) then use CentOS Plus Repository.
Exclude package from an update on CentOS operating system.
If you saw the “Failed to build gem native extension” error while building native mysql gem then you need to install libmysql++-dev package.
Let’s assume that we want to add friendly_name field to the bookmark_categories table.
Execute specific Rails tests.
The easiest way to check Ubuntu release is to use lsb_release command.