I'm having trouble with MySQL starting when the socket file is located in /var/run/mysql/mysql.sock instead of the default location /var/lib/mysql/mysql.sock. I have changed the owner and permission of the new directory, but I still get the following error in the log. I don't have another mysqld server running on this machine. 050919 12:24:11 [ERROR] Can't start server : Bind on unix socket: Permission denied 050919 12:24:11 [ERROR] Do you already have another mysqld server running on socket: /var/run/mysql/mysql.sock ? 050919 12:24:11 [ERROR] Aborting Paul