Starting MySQL.180402 14:47:32 mysqld_safe Directory '/var/lib/mysql' for UNIX socket file don't exi

本地虛拟機(CentOS6.8)啟動MySQL(MySQL5.6.35)服務失敗

[[email protected] ~]# service mysql status
 ERROR! MySQL is not running, but lock file (/var/lock/subsys/mysql) exists
[[email protected] ~]# rm -f /var/lock/subsys/mysql
[[email protected] ~]# service mysql status
 ERROR! MySQL is not running
[[email protected] ~]# service mysql start
Starting MySQL.170331 10:18:30 mysqld_safe Directory '/var/lib/mysql' for UNIX socket file don't exists.
 ERROR! The server quit without updating PID file (/usr/local/mysql/data/VMUest.pid).      

前一天就折騰了mysqlsla，今天MySQL就啟動不了。參考修改CentOS6.5主機名引起MySQL5.6.35服務問題裡面的方法沒有效果。各種糾結都沒用，最後想起啟動MySQL服務時，會優先在/etc/目錄下查找my.cnf

[[email protected] ~]# ll /etc/my.cnf
-rw-r--r--. 1 root root 251 Jan 27 05:41 /etc/my.cnf
[[email protected] ~]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
[[email protected] ~]# ll /etc/ |grep my
-rw-r--r--.  1 root root    251 Jan 27 05:41 my.cnf
[[email protected] ~]# mv /etc/my.cnf /etc/my.cnf.bak      

還真有/etc/my.cnf，裡面設定有socket=/var/lib/mysql/mysql.sock。我是使用源碼在虛拟機上安裝的MySQL，安裝目錄為/usr/local/mysql/，相關配置檔案都儲存在此目錄。并且有檢查/etc/my.cnf檔案是否存在(存在就将其重命名/删除)。怎麼又冒出來了？是折騰mysqlsla時出來的？

[[email protected] ~]# service mysql start
Starting MySQL........................................................... SUCCESS!       

把/etc/my.cnf重命名後，MySQL服務順利啟動~