service mysql start

报错：

网上搜了下，方法很多。

mysql启动异常：The server quit without updating PID file_starting mysql. error! the server quit without upd_指染流萤陌君颜的博客-CSDN博客

没解决还是报错，我们回到根本上排查。-- 查看错误日志

打开mysql配置：

less /etc/my.cnf

[mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Settings user and group are ignored when systemd is used. # If you need to run mysqld under a different user or group, # customize your systemd unit file for mariadb according to the # instructions in http://fedoraproject.org/wiki/Systemd

[mysqld_safe] log-error=/var/log/mariadb/mariadb.log pid-file=/var/run/mariadb/mariadb.pid

打开错误日志：

关键的错误信息

170901  4:56:55 [ERROR] Can't start server: Bind on TCP/IP port: Address already in use 170901  4:56:55 [ERROR] Do you already have another mysqld server running on port: 3306 ? 170901  4:56:55 [ERROR] Aborting

这个是端口占用。

使用端口占用命令查看

lsof -i:3306

看到了两个应用。这两个应用连接这个数据库。

kill掉

再启动mysq，成功。