买了个阿里云的vps 装了一个wordpress，mysql一直自动关闭，百思不得其解，只有搜索

最后才发现是因为服务器内存太小,毕竟是最便宜的才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

-----------------------------------------------------

没有100M的空间给他使用，修改/etc/mysql/my.cnf

增加

[mysqld]

innodb_buffer_pool_size=8MB

保存后，再启动mysql

mysql -u root -p

进入mysql

输入

show variables like'%buffer_pool%';

看到

+------------------------------+---------+

| Variable_name                | Value   |

+------------------------------+---------+

| innodb_buffer_pool_instances | 1       |

| innodb_buffer_pool_size      | 8388608 |

+------------------------------+---------+

说明成功了，这样就不会重启了，话说512m的内存真可怜。