MYSQL Server Crashes frequently on Amazon EC2 - Magento Website

We have client Magento site running on ec2 large instance. My Magento MySQL on EC2 crashes continuously, around every 12 hours. This happens on the live site. The site has more than 30000 products. The crashes started after we migrated from shared hosting to ec2. The continuous crashes are related to Innodb. Database size is around 650 MB. We migrated the data by using mysqldump command and restored it in EC2. Server environment : Php-fpm, Nginx , Mysqld , Varnish Server Config: Linux 64 bit RAM 7GB 100 GB space When MySQL crashes, the following is written to the log file /var/log/[login to view URL] 121219 02:54:18 mysqld_safe Number of processes running now: 0 121219 02:54:19 mysqld_safe mysqld restarted 121219 2:54:21 [Note] Plugin 'FEDERATED' is disabled. 121219 2:54:21 InnoDB: The InnoDB memory heap is disabled 121219 2:54:21 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121219 2:54:21 InnoDB: Compressed tables use zlib 1.2.5 121219 2:54:21 InnoDB: Using Linux native AIO 121219 2:54:25 InnoDB: Initializing buffer pool, size = 3.0G InnoDB: mmap(3296722944 bytes) failed; errno 12 121219 2:54:25 InnoDB: Completed initialization of buffer pool 121219 2:54:25 InnoDB: Fatal error: cannot allocate memory for the buffer pool 121219 2:54:25 [ERROR] Plugin 'InnoDB' init function returned error. 121219 2:54:25 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 121219 2:54:25 [ERROR] Failed to initialize plugins. 121219 2:54:25 [ERROR] Aborting 121219 2:54:25 [Note] /usr/libexec/mysqld: Shutdown complete 121219 02:54:25 mysqld_safe mysqld from pid file /var/run/mysqld/[login to view URL] ended When we check status before restart MySQL it shows the following output: “mysqld dead but subsys locked.” In these cases, the only thing we have to restart the server, after which MySQL can be restarted. In these cases, the output looks like this following: 121219 04:19:32 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 121219 4:19:32 [Note] Plugin 'FEDERATED' is disabled. 121219 4:19:32 InnoDB: The InnoDB memory heap is disabled 121219 4:19:32 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121219 4:19:32 InnoDB: Compressed tables use zlib 1.2.5 121219 4:19:32 InnoDB: Using Linux native AIO 121219 4:19:32 InnoDB: Initializing buffer pool, size = 3.0G 121219 4:19:33 InnoDB: Completed initialization of buffer pool 121219 4:19:33 InnoDB: highest supported file format is Barracuda. InnoDB: Log scan progressed past the checkpoint lsn 3185919093 121219 4:19:33 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... InnoDB: Doing recovery: scanned up to log sequence number 3185974511 I have full file and [login to view URL] config attached to understand more about this issue. Any queries contact me on PMB and this requires to fix ASAP.