MySQL常见内存不足启动失败的完美解决方法

1.启动Mysql时一直不成功，查看错误日志 /var/log/mysql/error.log

2.主要的错误信息有如下几条:

[ERROR] InnoDB: mmap(136151040 bytes) failed; errno 12
[ERROR] InnoDB: Cannot allocate memory for the buffer pool
[ERROR] InnoDB: Plugin initialization aborted with error Generic error
[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' reGIStration as a STORAGE ENGINE failed.
[ERROR] Failed to initialize plugins.
[ERROR] Aborting