mysql 启动报错 /usr/local/mysql//libexec/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid'

ysql启动 提示 

[root@localhost var]# Starting mysqld daemon with databases from /var/lib/mysql

STOPPING server from pid file /var/run/mysqld/mysqld.pid

120516 15:23:19  mysqld ended

/var/log/mysqld.log信息为 

 /usr/local/mysql//libexec/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13) 120516 15:23:19 [ERROR] Can't start server: can't create PID file: Permission denied

 修改 /var/run/mysqld/权限为mysql 

chown -R mysql /var/run/mysqld

chgrp -R mysql /var/run/mysqld