mysql fails to start

[hellomythili]

I am doing a backup server for an already existing servers set up, I use to ubuntu linux.
it is DRBD (protocol C) together with heartbeat used, which is configured so that in case of error including the MySQL5 Server on the backup server starts
I want to start mysql server after replication using drbd and heartbeat.
I changed datadir in my.cnf file and in apparmor.d/usr.bin.mysqld also.
Mysql starts when drbd device is not mounted.

My logs shows as follows:

Oct 26 12:55:28 twyford-hambc2 mysqld[27627]: 101026 12:55:28 InnoDB: Operating system error number 13 in a file operation.
Oct 26 12:55:28 twyford-hambc2 mysqld[27627]: InnoDB: The error means mysqld does not have the access rights to
Oct 26 12:55:28 twyford-hambc2 mysqld[27627]: InnoDB: the directory.
Oct 26 12:55:28 twyford-hambc2 mysqld[27627]: InnoDB: File name ./ibdata1
Oct 26 12:55:28 twyford-hambc2 mysqld[27627]: InnoDB: File operation call: 'open'.
Oct 26 12:55:28 twyford-hambc2 mysqld[27627]: InnoDB: Cannot continue operation.
Oct 26 12:55:28 twyford-hambc2 mysqld_safe[27634]: ended

Oct 26 12:55:42 twyford-hambc2 kernel: [ 2876.791880] type=1503 audit(1288094142.991:53: operation="inode_permission" requested_mask="::r" denied_mask="::r" fsuid=0 $
Oct 26 12:55:42 twyford-hambc2 /etc/init.d/mysql[27799]: 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in
Oct 26 12:55:42 twyford-hambc2 /etc/init.d/mysql[27799]: ^G/usr/bin/mysqladmin: connect to server at 'localhost' failed
Oct 26 12:55:42 twyford-hambc2 /etc/init.d/mysql[27799]: error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)'
Oct 26 12:55:42 twyford-hambc2 /etc/init.d/mysql[27799]: Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists!
Oct 26 12:55:42 twyford-hambc2 /etc/init.d/mysql[27799]:
Oct 26 12:56:46 twyford-hambc2 lrmd: [17345]: WARN: mysql:start process (PID 2732 timed out (try 1). Killing with signal SIGTERM (15).
Oct 26 12:56:46 twyford-hambc2 lrmd: [17345]: WARN: operation start[139] on ocf::mysql::mysql for client 17348, its parameters: socket=[/var/run/mysqld/mysqld.sock] bi$


Please help in solving this....

[Rubberman]

Seems clear enough - MySQL doesn't have permissions to access the database itself. If mounted on a remote system, then that is likely the problem - you may need to alter the mount parameters, or the file permissions on the hosting system.

[hellomythili]

Thanks for your reply.
I am new to linux.
So please tell the exact location to check the mount parameters .

Mythili