问题描述
在启动mysql服务的过程中,
sudo service mysql start
抛出异常
Job for mysql.service failed because the control process exited with error code. See "systemctl status mysql.service" and "journalctl -xe" for details.
通过执行
systemctl status mysql.service
得到提示信息
* mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: activating (start-post) (Result: exit-code) since Thu 2019-08-01 16:31:44 CST; 5s ago
Process: 12773 ExecStart=/usr/sbin/mysqld (code=exited, status=1/FAILURE)
Process: 12767 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
Main PID: 12773 (code=exited, status=1/FAILURE); : 12774 (mysql-systemd-s)
CGroup: /docker/b3c0096db92555e3edf5393809f9e4200974750aa13b4d106583728f20dd8b2c/system.slice/mysql.service
`-control
|-12774 /bin/bash /usr/share/mysql/mysql-systemd-start post
`-12787 sleep 1
分析
结合网上的文章, 有如下几种说法.
- 服务器磁盘已满
排查 : 可以通过df -h
查看服务器磁盘使用情况. -
mysql配置文件出错
排查:
先执行mysql
如果是配置文件出错,则报错
mysql: [ERROR] Found option without preceding group in config file /etc/mysql/my.cnf at **line 20**!
mysql: [ERROR] Fatal error in defaults handling. Program aborted!
如果配置文件不出错的话, 则抛出异常
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
这是正常返回, 因为mysql服务没有启动, 所以不可能连接上. 只是用来排查配置文件是否出错.
最终发现引起mysql不能启动的原因在于mysql
的配置文件中(个人环境下路径是/etc/mysql/mysql.conf.d/mysqld.cnf
) 记录error
的log
文件路径(log_error = /var/log/mysql/error.log
)不存在.
解决这个问题必须创建该目录并且将相关权限交给mysql:mysql
用户.
sudo mkdir -p /var/log/mysql
sudo touch /var/log/mysql/error.log
sudo chown mysql:mysql /var/log/mysql
sudo chown mysql:mysql /var/log/mysql/error.log