迁移的网站生成文档到三分之一左右的时候报错：
Error infos:DedeCms错误警告：连接数据库失败可能是数据库密码不对或数据库服务器出错！
火大，登陆MySQL发现
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'
service mysqld restart 重启失败:mysql daemon failed to start
cat /var/log/mysqld.log 发现：
[NOTE] InnoDB: Initializing buffer pool, size = 128.0M
[NOTE] InnoDB: mmap(137363456 bytes) failed; errno 12
[ERROR] InnoDB: Cannot allocate memory for the buffer pool
[ERROR] Plugin 'InnoDB' init function returned error.
[ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
[ERROR] Unknown/unsupported storage engine: InnoDB
[ERROR] Aborting
问题找到，分配不了足够的内存，
vim /etc/my.cnf
innodb_buffer_pool_size=100M
service mysqld start --------ok
搞定