centos7 mysql 启动mysqld.service - SYSV: MySQL database server错误

1.启动命令

systemctl start mysqld.service 或者 /etc/init.d/mysqld start   结果同样的错误

2.错误是:

Job for mysqld.service failed. See 'systemctl status mysqld.service' and 'journalctl -xn' for details.

3.按照提示输入命令

systemctl status mysqld.service 或者 journalctl -xn

命令后提示:

mysqld.service - SYSV: MySQL database server.
    Loaded: loaded (/etc/rc.d/init.d/mysqld)
    Active: failed (Result: exit-code) since Tue 2017-03-14 09:00:45 CST; 9s ago
  Process: 2550 ExecStart=/etc/rc.d/init.d/mysqld start (code=exited, status=1/FAILURE)
  Starting SYSV: MySQL database server....
  MySQL Daemon failed to start.
Starting mysqld:  [FAILED]
mysqld.service: control process exited, code=exited status=1
Failed to start SYSV: MySQL database server..
Unit mysqld.service entered failed state.

4.进一步查看日志:

vi /var/log/mysqld.log

如下:

[ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 2 - No such file or directory)
[ERROR] Can't start server: can't create PID file: No such file or directory

5.创建该目录

mkdir -p /var/run/mysqld/

6.启动mysql服务

/etc/init.d/mysqld start

错误和原来一致

7.查看日志:

如下:

[ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13 - Permission denied)
          [ERROR] Can't start server: can't create PID file: Permission denied

8.授权

chown mysql.mysql /var/run/mysqld/

9.启动

/etc/init.d/mysqld start
      Starting mysqld (via systemctl):                           [  OK  ]
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原文链接：https://blog.csdn.net/loveuserzzz/article/details/62036988