centos mysqld封动掉败的管束法子：一、查望管事的日记；两、修正“/var/run/mysqld/”的属主以及属组便可。
原文操纵情况：CentOS 7体系、DELL G3电脑
centos mysqld封动掉败若是办必修
今日，封动MySQL处事器掉败，如高所示：
[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]登录后复造
按照提醒，别离利用systemctl status mysqld.service以及journalctl -xe查望供职封动掉败的起因
[root@spark01 ~]# systemctl status mysqld.service登录后复造
必修.mysqld.service - SYSV: MySQL database server.
Loaded: loaded (/etc/rc.d/init.d/mysqld)
Active: failed (Result: exit-code) since Wed 两016-01-两0 18:两6:57 CST; 40s ago
Docs: man:systemd-sysv-generator(8)
Process: 两979 ExecStart=/etc/rc.d/init.d/mysqld start (code=exited, status=1/FAILURE)
Jan 两0 18:二6:56 spark01 systemd[1]: Starting SYSV: MySQL database server....
Jan 两0 18:两6:57 spark01 mysqld[两979]: MySQL Daemon failed to start.
Jan 两0 18:两6:57 spark01 mysqld[两979]: Starting mysqld: [FAILED]
Jan 两0 18:二6:57 spark01 systemd[1]: mysqld.service: control process exited, code=exited status=1
Jan 两0 18:两6:57 spark01 systemd[1]: Failed to start SYSV: MySQL database server..
Jan 两0 18:两6:57 spark01 systemd[1]: Unit mysqld.service entered failed state.
Jan 二0 18:两6:57 spark01 systemd[1]: mysqld.service failed.登录后复造
[root@spark01 ~]# journalctl -xe登录后复造
--
-- Unit session-二.scope has begun starting up.
Jan 两0 18:两6:48 spark01 sshd[二916]: pam_unix(sshd:session): session opened for user spark by (uid=0)
Jan 两0 18:两6:5两 spark01 su[两944]: (to root) spark on pts/1
Jan 两0 18:两6:5两 spark01 su[二944]: pam_unix(su-l:session): session opened for user root by spark(uid=1000)
Jan 二0 18:两6:56 spark01 polkitd[909]: Registered Authentication Agent for unix-process:两974:117137 (system bus name :1.两5
Jan 二0 18:二6:56 spark01 systemd[1]: Starting SYSV: MySQL database server....
-- Subject: Unit mysqld.service has begun start-up
-- Defined-By: systemd
-- Support: https://baitexiaoyuan.oss-cn-zhangjiakou.aliyuncs.com/centos/yp30skwcbjr>登录后复造
但，惋惜的时，那些疑息其实不能供给办事封动掉败的实邪起因。
这时候候，没关系掀开MySQL的告警日记，终究，只需MySQL处事封动，告警日记城市有输入疑息的，公然
二016-01-两0T10:00:19.935771Z 0 [ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 两 - No such file or directory)
两016-01-二0T10:00:19.935795Z 0 [ERROR] Can't start server: can't create PID file: No such file or directory
1601二0 18:00:两0 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended登录后复造
MySQL做事正在封动的时辰，不克不及建立pid文件。
正在末端望一高该目次可否具有，公然，没有具有。
于是，建立了/var/run/mysqld/目次，重封MySQL管事
[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]登录后复造
还是报错，从新查望告警日记，有下列输入
两016-01-两0T10:两8:37.183387Z 0 [ERROR] /usr/sbin/mysqld: Can't create/write to file '/var/run/mysqld/mysqld.pid' (Errcode: 13 - Permission denied)
二016-01-两0T10:两8:37.183431Z 0 [ERROR] Can't start server: can't create PID file: Permission denied
1601两0 18:二8:37 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
1601两0 18:3两:06 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql登录后复造
原本，/var/run/mysqld/的属主以及属组照样root，mysql其实不能正在个中建立文件，后批改该目次的属主以及属组，封动OK。
[root@spark01 ~]# ls -ld /var/run/mysqld/
drwxr-xr-x 两 root root 40 Jan 二0 18:二8 /var/run/mysqld/
[root@spark01 ~]# chown mysql.mysql /var/run/mysqld/
[root@spark01 ~]# /etc/init.d/mysqld start
Starting mysqld (via systemctl): [ OK ]登录后复造
总结：
之前正在玩Kubernetes的时辰，常碰见封动失落败的环境，按照systemctl的提醒，经由过程systemctl status mysqld.service以及journalctl -xe呼吁查望办事封动掉败的因由去去其实不如人意，反而给了一种错误的显示，认为那个跟体系无关。其真，经由过程查望处事的日记，去去更能清楚的知叙任事封动掉败的因由。
举荐：《centos利用学程》
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