Upgrading CentOS 5, 6 and 7

The venerable and stable CentOS 5 will soon reach its “end-of-life” (EOL) soon. From the official CentOS wiki page, CentOS 5 end-of-life (EOL) date is March 31st, 2017.  It has stopped receiving full updates since the 1st quarter of 2014. After its EOL in...