I'm running a Wordpress Blog that gets medium-high traffic. It is hosted in an Ubuntu Server 2GB Memory 2 Core Processor 40GB SSD Disk, 3TB Transfer.

The problem is that MySQL shuts down by itself after an hour or two. I had to restart mysql each and every time this happens. I checked the logs and this is what I found:

140612  6:48:14 [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.
140612  6:48:14 [Note] Plugin 'FEDERATED' is disabled.
140612  6:48:14 InnoDB: The InnoDB memory heap is disabled
140612  6:48:14 InnoDB: Mutexes and rw_locks use GCC atomic builtins
140612  6:48:14 InnoDB: Compressed tables use zlib 1.2.3.4
140612  6:48:14 InnoDB: Initializing buffer pool, size = 1.4G
InnoDB: mmap(1502412800 bytes) failed; errno 12
140612  6:48:14 InnoDB: Completed initialization of buffer pool
140612  6:48:14 InnoDB: Fatal error: cannot allocate memory for the buffer pool
140612  6:48:14 [ERROR] Plugin 'InnoDB' init function returned error.
140612  6:48:14 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140612  6:48:14 [ERROR] Unknown/unsupported storage engine: InnoDB
140612  6:48:14 [ERROR] Aborting

140612  6:48:14 [Note] /usr/sbin/mysqld: Shutdown complete

judging by this line:

140612  6:48:14 InnoDB: Fatal error: cannot allocate memory for the buffer pool

I suspect that this is a memory problem, but I would like to hear from the experts here before I conclude.

Is this a lack of memory problem? Do you think the value of max_connections in my.cnf (currently 100) is a potential cause and needs increasing?

TIA.