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这时候,不妨打开MySQL的告警日志,毕竟,只要MySQL服务启动,告警日志都会有输出信息的,果然

2016-01-20T10:00:19.935771Z 0 [ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 2 - No such file or directory) 2016-01-20T10:00:19.935795Z 0 [ERROR] Can't start server: can't create PID file: No such file or directory 160120 18:00:20 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

MySQL服务在启动的时候,不能创建pid文件。

在终端看一下该目录是否存在,果然,不存在。

于是,创建了/var/run/mysqld/目录,重启MySQL服务

[root@spark01 ~]# mkdir -p /var/run/mysqld/

[root@spark01 ~]# /etc/init.d/mysqld start

Starting mysqld (via systemctl):  Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.                                                            [FAILED]

依旧报错,重新查看告警日志,有以下输出

2016-01-20T10:28:37.183387Z 0 [ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13 - Permission denied) 2016-01-20T10:28:37.183431Z 0 [ERROR] Can't start server: can't create PID file: Permission denied 160120 18:28:37 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended 160120 18:32:06 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql

原来,/var/run/mysqld/的属主和属组还是root,mysql并不能在其中创建文件,后修改该目录的属主和属组,启动OK。

[root@spark01 ~]# ls -ld /var/run/mysqld/ drwxr-xr-x 2 root root 40 Jan 20 18:28 /var/run/mysqld/ [root@spark01 ~]# chown mysql.mysql /var/run/mysqld/ [root@spark01 ~]# /etc/init.d/mysqld start Starting mysqld (via systemctl):                           [  OK  ]

 

总结:

以前在玩Kubernetes的时候,常遇到启动失败的情况,根据systemctl的提示,通过systemctl status mysqld.service和journalctl -xe命令查看服务启动失败的原因往往并不如人意,反而给了一种错误的暗示,以为这个跟系统有关。其实,通过查看服务的日志,往往更能清晰的知道服务启动失败的原因

posted on 2018-05-10 15:23 林的 阅读(49) 评论(0)  编辑  收藏 所属分类: mysql

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