買了個阿里雲的vps 裝了一個wordpress，mysql一直自動關閉，百思不得其解，只有搜尋
最後才發現是因為伺服器記憶體太小,畢竟是最便宜的才512m
-----------------------------------------------------
InnoDB: mmap(137363456 bytes) failed; errno 12
140521 1:53:50 InnoDB: Completed initialization of buffer pool
140521 1:53:50 InnoDB: Fatal error: cannot allocate memory for the buffer pool
140521 1:53:50 [ERROR] Plugin 'InnoDB' init function returned error.
140521 1:53:50 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
140521 1:53:50 [ERROR] Unknown/unsupported storage engine: InnoDB
140521 1:53:50 [ERROR] Aborting
140521 1:53:50 [Note] /usr/sbin/mysqld: Shutdown complete
-----------------------------------------------------
沒有100M的空間給他使用，修改/etc/mysql/my.cnf
增加
[mysqld]
innodb_buffer_pool_size=8MB
儲存後，再啟動mysql
mysql -u root -p
進入mysql
輸入
show variables like'%buffer_pool%';
看到
+------------------------------+---------+
| Variable_name | Value |
+------------------------------+---------+
| innodb_buffer_pool_instances | 1 |
| innodb_buffer_pool_size | 8388608 |
+------------------------------+---------+
說明成功了，這樣就不會重啟了，話說512m的記憶體真可憐。