While doing a mysql restart we may sometime get the below given error.

================
~]# service mysql restart
MySQL manager or server PID file could not be found! [FAILED]
Starting MySQLCouldn't find MySQL manager (/var/lib/bin/mys[FAILED]r) or server (/var/lib/bin/mysqld_safe)
================

Solution : Make sure that you comment out the basedir directive from /etc/my.cnf file

==========
[mysql.server ]
server=mysql
#basedir=/var/lib
==========

After that do a mysql restart and mysql will start without issues!