Remember once not start mysql service

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Before opening the machine back the project, we found that when landing back-office systems, enter a user name, password, user name or password prompt.

1.连接mysql数据库，发现链接不上，但是ps -ef |grep mysql 发现有mysql服务

2.输入mysql -u root -p ，提示说找不到sock文件

3.service mysqld restart 重启失败

4.重启机器，还是连接不上数据库，

但在重启机器后，登录进虚机系统后发现第一行提示： grep:write error

5.df -h 查看 发现 机器磁盘已满

6.查看/var/log/mysql.log ，mysql的日志中发现磁盘已满，pid文件写不进去，因此服务没启动起来

7.删除掉无用文件，service mysqld restart  mysql服务成功启动