sh-4.1# /etc/init.d/mysqld status

 ERROR! MySQL is not running, but lock file (/var/lock/subsys/mysql) exists

sh-4.1# /etc/init.d/mysqld start

Starting MySQL. ERROR! The server quit without updating PID file (/data1/mysql/mysql.pid).

sh-4.1# rm mysql

sh-4.1# /etc/init.d/mysqld status

 ERROR! MySQL is not running

sh-4.1# /etc/init.d/mysqld start

Starting MySQL. ERROR! The server quit without updating PID file (/data1/mysql/mysql.pid).

  :: [Note] /apps/mysql-5.5./bin/mysqld: Shutdown complete

 :: mysqld_safe mysqld from pid file /data1/mysql/mysql.pid ended

 :: mysqld_safe Starting mysqld daemon with databases from /data1/mysql/

  :: [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.

  :: [Note] Plugin 'FEDERATED' is disabled.

  :: InnoDB: The InnoDB memory heap is disabled

  :: InnoDB: Mutexes and rw_locks use GCC atomic builtins

  :: InnoDB: Compressed tables use zlib 1.2.

  :: InnoDB: Using Linux native AIO

  :: InnoDB: Initializing buffer pool, size = .0G

InnoDB: mmap( bytes) failed; errno

  :: InnoDB: Completed initialization of buffer pool

  :: InnoDB: Fatal error: cannot allocate memory for the buffer pool

  :: [ERROR] Plugin 'InnoDB' init function returned error.

  :: [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.

  :: [ERROR] Unknown/unsupported storage engine: InnoDB

  :: [ERROR] Aborting

  :: [Note] /apps/mysql-5.5./bin/mysqld: Shutdown complete

 :: mysqld_safe mysqld from pid file /data1/mysql/mysql.pid ended

sh-4.1# grep "innodb-buffer-pool-size" /etc/my.cnf

innodb-buffer-pool-size        = 1G

#innodb-buffer-pool-size        = 2G