selinux disabling centos7 friendly
Use systemctl on Centos 7
Correctly let the OS tell us its $releasever
Prefix all variables with @
manage firewalld service in centos 7 instead of iptables
Use defaults for status and stop
Bye to Percona-Server-shared-51
Prefix all variables with @
show Centos 6.5 or 7.0 options