阿裏雲 CentOS 7.2 MySQL服務啟動失敗的解決思路

前言 ：

昨天剛剛搭建好的MySQL讓老大看了一下，經過測試已經完成任務。但是今天早晨來的時候發現服務器被關了，此時我的心情崩潰的，但是我非常冷靜的解決了MySQL問題。如下：

啟動MySQL服務器失敗，如下所示：

[[email protected] ~]# /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]

根據提示，分別使用systemctl status mysqld.service和journalctl -xe查看服務啟動失敗的原因

[[email protected] ~]# 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.

[[email protected] ~]# journalctl -xe

但，可惜的時，這些信息並不能提供服務啟動失敗的真正原因。

這時候，不妨打開MySQL的告警日誌，畢竟，只要MySQL服務啟動，告警日誌都會有輸出信息的，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服務在啟動的時候，不能創建pid文件。

在終端看一下該目錄是否存在，果然，不存在。

於是，創建了/var/run/mysqld/目錄，重啟MySQL服務

[[email protected] ~]# mkdir -p /var/run/mysqld/

[[email protected] ~]# /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]

依舊報錯，重新查看告警日誌，有以下輸出

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

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阿裏雲CentOS 7.2 MySQL服務啟動失敗的解決思路