[Warning] Can't create test file /var/lib/mysql/localhost.lower-test

          今日在做mysql主从配置时，遇到一个问题，问题如下：

141017 22:41:02 [Note] /usr/libexec/mysqld: Shutdown complete

141017 22:41:02 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
141017 22:42:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
141017 22:42:11 [Warning] Can't create test file /var/lib/mysql/localhost.lower-test
141017 22:42:11 [Warning] Can't create test file /var/lib/mysql/localhost.lower-test
^G/usr/libexec/mysqld: File './mysql-bin.index' not found (Errcode: 13)
141017 22:42:11 [ERROR] Aborting

141017 22:42:11 [Note] /usr/libexec/mysqld: Shutdown complete

141017 22:42:11 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended

竟然发现mysql不能启动了，这个问题让我找不到原因。平时复制mysql的数据文件，基本上都没有报什么错误，但是这次却让我不知所措。在网上查找资料后，查看自己的SELINUX是开着的。关闭后，竟然能启动了。