/etc/init.d/mysql stop
/scripts/update_local_rpm_versions --edit target_settings.MySQL50 uninstalled
/scripts/update_local_rpm_versions --edit target_settings.MySQL51 uninstalled
/scripts/update_local_rpm_versions --edit target_settings.MySQL55 uninstalled
/scripts/check_cpanel_rpms --fix --targets=MySQL50,MySQL51,MySQL55
rpm -Uhv http://www.percona.com/downloads/percona-release/percona-release-0.0-1.x86_64.rpm
Open /etc/yum.conf and remove php
yum install Percona-Server-client-55 Percona-Server-server-55 Percona-Server-devel-55
/etc/init.d/mysql start
mysql_upgrade
/etc/init.d/mysql restart
Open /etc/yum.conf and readd php that you removed earlier
/scripts/easyapache --build