Using rsync and hard links, it is possible to keep multiple, full backups instantly available. The disk space required is just a little more than the space of one full backup, plus incrementals.
Kanif is a tool for cluster management and administration. It combines main features of well known cluster management tools such as c3, pdsh and dsh and mimics their syntax. For the effective cluster management it relies on TakTuk, a tool for large scale remote execution deployment.
MySQLTuner is a script written in Perl that allows you to review a MySQL installation quickly and make adjustments to increase performance and stability.