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阿里云CentOS 7.2 MySQL服务启动失败的解决思路
阿里云 CentOS 7.2 MySQL服务启动失败的解决思路
前言 ：
昨天刚刚搭建好的MySQL让老大看了一下，经过测试已经完成任务。但是今天早晨来的时候发现服务器被关了，此时我的心情崩溃的，但是我非常冷静的解决了MySQL问题。如下：
启动MySQL服务器失败，如下所示：
[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]
根据提示，分别使用systemctl status mysqld.service和journalctl -xe查看服务启动失败的原因
[root@spark01 ~]# systemctl status mysqld.service
mysqld.service - SYSV: MySQL database server. Loaded: loaded (/etc/rc.d/init.d/mysqld) Active: failed (Result: exit-code) since Wed 2016-01-20 18:26:57 CST; 40s ago Docs: man:systemd-sysv-generator(8) Process: 2979 ExecStart=/etc/rc.d/init.d/mysqld start (code=exited, status=1/FAILURE) spark01 systemd[1]: Starting SYSV: MySQL database server.... spark01 mysqld[2979]: MySQL Daemon failed to start.spark01 mysqld[2979]: Starting mysqld: [FAILED] spark01 systemd[1]: mysqld.service: control process exited, code=exited status=1Jan 20 18:26:57 spark01 systemd[1]: Failed to start SYSV: MySQL database server.. spark01 systemd[1]: Unit mysqld.service entered failed state. spark01 systemd[1]: mysqld.service failed.
[root@spark01 ~]# journalctl -xe
但，可惜的时，这些信息并不能提供服务启动失败的真正原因。
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
2017-06-6T09:00:19.935771Z 0 [ERROR] /usr/sbin/mysqld: Can‘t create/write to file ‘/var/run/mysqld/mysqld.pid‘ (Errcode: 2 - No such file or directory)2017-06-20T10:00:19.935795Z 0 [ERROR] Can‘t start server: can‘t create PID file: No such file or directory160120 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
2017-06-6T09:28:37.183387Z 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 denied160120 18:28:37 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended160120 18:32:06 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
本文出自 “李世龙” 博客，谢绝转载！
阿里云CentOS 7.2 MySQL服务启动失败的解决思路
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