vim /var/log/mysqld.log
2018-02-04 13:22:49 28507 [ERROR] InnoDB: Cannot allocate memory for the buffer pool
2018-02-04 13:22:49 28507 [ERROR] Plugin ‘InnoDB‘ init function returned error.
2018-02-04 13:22:49 28507 [ERROR] Plugin ‘InnoDB‘ registration as a STORAGE ENGINE failed.
2018-02-04 13:22:49 28507 [ERROR] Unknown/unsupported storage engine: InnoDB
2018-02-04 13:22:49 28507 [ERROR] Aborting
https://stackoverflow.com/questions/25965638/mysql-fatal-error-cannot-allocate-memory-for-the-buffer-pool
http://blog.csdn.net/xianglingchuan/article/details/72725346