I can not restart mysql:

February 8, 2014 10.7k views
I can not restart mysql: 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 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
3 Answers
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).
If you don't have enough memory in the machine you probably need to either upgrade the machine or lower the limit.
Thank you very much Joachim Fermstad

Thank you Joachim and DGGBCN, I solved with command sudo -u mysql mysqld

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