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记一次MySQL启动故障 Can't connect to local MySQL server through socket

2017-03-21 10:09 525 查看

记一次MySQL启动故障 Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

故障现象：

[root@CentOS ~]# mysql -uroot -p
Enter password:
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
[root@CentOS ~]#

[root@CentOS ~]# service mysqld restart
Stopping mysqld:                                           [  OK  ]
MySQL Daemon failed to start.
Starting mysqld:                                           [FAILED]
[root@CentOS ~]#

查找MySQL的错误日志在哪里

[root@CentOS ~]# find / -iname '*.err'
/var/lib/mysql/CentOS.err
[root@CentOS ~]#

分析错误

[root@CentOS ~]# tail /var/lib/mysql/CentOS.err
170321 09:48:17 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
/usr/libexec/mysqld: error while loading shared libraries: libstdc++.so.6: failed to map segment from shared object: Permission denied
170321 09:48:17 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
[root@CentOS ~]#

[root@CentOS ~]# find / -iname '*libstdc++.so.6*'
/usr/lib/libstdc++.so.6
/usr/lib/libstdc++.so.6.0.13
/usr/lib/libstdc++.so.6.0.22
[root@CentOS ~]#

[root@CentOS ~]# ll /usr/lib/libstdc++.so.6*
lrwxrwxrwx. 1 root   root        19 3月  12 10:36 /usr/lib/libstdc++.so.6 -> libstdc++.so.6.0.22
-rwxr-xr-x. 1 root   root    942040 11月 21 2013 /usr/lib/libstdc++.so.6.0.13
-rwxr-xr-x. 1 chunli chunli 9099895 3月  12 07:27 /usr/lib/libstdc++.so.6.0.22
[root@CentOS ~]#

搜了一会儿，也没有找到合适的解决方法，倒是看到不少SElinux的身影
尝试关闭SElinux

[root@CentOS ~]# getenforce
Enforcing
[root@CentOS ~]# setenforce 0
[root@CentOS ~]# getenforce
Permissive
[root@CentOS ~]# service mysqld restart
Stopping mysqld:                                           [  OK  ]
Starting mysqld:                                           [  OK  ]

问题并没有直接解决，而是绕过去了，有时间再啃啃了，先做手头上的事儿。

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标签： MySQL 启动故障记一次

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