重新安装mysql时，运行

systemctl status mysqld.service

报错。

[root@test-dcruxue ~]# systemctl start  mysqld.service

Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

查看mysql服务状态

[root@test-dcruxue ~]# systemctl status mysqld.service

● mysqld.service - MySQL Server

   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)

   Active: failed (Result: exit-code) since Tue 2018-07-17 16:14:22 CST; 8min ago

     Docs: man:mysqld(8)

           http://dev.mysql.com/doc/refman/en/using-systemd.html

  Process: 17451 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=1/FAILURE)

  Process: 17376 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)

 Main PID: 16428 (code=exited, status=1/FAILURE)

Jul 17 16:13:41 test-dcruxue systemd[1]: Starting MySQL Server...

Jul 17 16:14:20 test-dcruxue mysqld[17451]: Initialization of mysqld failed: 0

Jul 17 16:14:20 test-dcruxue systemd[1]: mysqld.service: control process exited, code=exited status=1

Jul 17 16:14:22 test-dcruxue systemd[1]: Failed to start MySQL Server.

Jul 17 16:14:22 test-dcruxue systemd[1]: Unit mysqld.service entered failed state.

Jul 17 16:14:22 test-dcruxue systemd[1]: mysqld.service failed.

无果；

遂想到查看日志：cat /var/log/mysqld.log

2018-07-17T08:23:01.745601Z 0 [ERROR] Can't start server: Bind on TCP/IP port: Address already in use

2018-07-17T08:23:01.745607Z 0 [ERROR] Do you already have another mysqld server running on port: 3306 ?

2018-07-17T08:23:01.745619Z 0 [ERROR] Aborting

发现3306端口被占用

[root@test-dcruxue ~]# ps aux|grep mysql

root      9861  0.0  0.0 113252  1600 ?        S    14:52   0:00 /bin/sh /usr/bin/mysqld_safe --skip-grant-table

mysql    10009  0.0  5.6 1585376 457120 ?      Sl   14:52   0:03 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --skip-grant-table --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock

root     17563  0.0  0.0 112648   956 pts/2    R+   16:32   0:00 grep --color=auto mysql

然后杀掉进程

[root@test-dcruxue ~]# kill -9 10009

就ok了

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