Раз в сутки или чаще мускул ложится.
Памяти много, 32 гб, нагрузки мизер на сервере.

160105 18:12:19 mysqld_safe Number of processes running now: 0 160105 18:12:19 mysqld_safe mysqld restarted 160105 18:12:19 [Note] /usr/libexec/mysqld (mysqld 5.5.47) starting as process 7375… 160105 18:12:19 [Note] Plugin 'FEDERATED' is disabled. 160105 18:12:19 InnoDB: Mutexes and rw_locks use GCC atomic builtins 160105 18:12:19 InnoDB: Compressed tables use zlib 1.2.3 160105 18:12:19 InnoDB: Using Linux native AIO 160105 18:12:19 InnoDB: Initializing buffer pool, size = 24.0G InnoDB: mmap(26373783552 bytes) failed; errno 12 160105 18:12:19 InnoDB: Completed initialization of buffer pool 160105 18:12:19 InnoDB: Fatal error: cannot allocate memory for the buffer pool 160105 18:12:19 [ERROR] Plugin 'InnoDB' init function returned error. 160105 18:12:19 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 160105 18:12:19 [ERROR] Unknown/unsupported storage engine: innodb 160105 18:12:19 [ERROR] Aborting 160105 18:12:19 [Note] /usr/libexec/mysqld: Shutdown complete 160105 18:12:20 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

my.cnf
[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql symbolic-links=0 max_connections=200 max_user_connections=30 key_buffer_size=8G myisam_sort_buffer_size = 3G open_files_limit = 100000 wait_timeout=30 interactive_timeout=50 long_query_time=5 skip-name-resolve #log-queries-not-using-indexes #log-slow-queries=/var/log/mysql/log-slow-queries.log #innodb_use_native_aio = 0 innodb_file_per_table #was added by me, down mysql innodb=ON default-storage-engine=innodb innodb_use_sys_malloc=0 innodb_buffer_pool_size=24G [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid