I can not restart mysql:

Posted on February 8, 2014

sudo service mysql restart stop: Unknown instance: start: Job failed to start

sudo -u mysql mysqld

140208 10:17:11 [Note] Plugin ‘FEDERATED’ is disabled. 140208 10:17:11 InnoDB: The InnoDB memory heap is disabled 140208 10:17:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins 140208 10:17:11 InnoDB: Compressed tables use zlib 1.2.3.4 140208 10:17:11 InnoDB: Initializing buffer pool, size = 4.0G InnoDB: mmap(4395630592 bytes) failed; errno 12 140208 10:17:11 InnoDB: Completed initialization of buffer pool 140208 10:17:11 InnoDB: Fatal error: cannot allocate memory for the buffer pool 140208 10:17:11 [ERROR] Plugin ‘InnoDB’ init function returned error. 140208 10:17:11 [ERROR] Plugin ‘InnoDB’ registration as a STORAGE ENGINE failed. 140208 10:17:11 [ERROR] Unknown/unsupported storage engine: InnoDB 140208 10:17:11 [ERROR] Aborting

140208 10:17:11 [Note] mysqld: Shutdown complete

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joachim

February 8, 2014

It seems it can’t initialize the InnoDB storage engine because it can’t allocate the 4GB buffer pool (innodb_buffer_pool_size parameter in my.cnf). <br>If you don’t have enough memory in the machine you probably need to either upgrade the machine or lower the limit.