/usr/libexec/mysqld: File './mysql
150214 00:19:30 mysqld_safe Starting mysqld daemon with databases from /data/mysql 150214 0:19:30 [Warning] Can't create test file /data/mysql/localhost.lower-test 150214 0:19:30 [Warning] Can't create test file /data/mysql/localhost.lower
150214 00:19:30 mysqld_safe Starting mysqld daemon with databases from /data/mysql150214 0:19:30 [Warning] Can't create test file /data/mysql/localhost.lower-test
150214 0:19:30 [Warning] Can't create test file /data/mysql/localhost.lower-test
/usr/libexec/mysqld: File './mysql-bin.index' not found (Errcode: 13)
150214 0:19:30 [ERROR] Aborting
150214 0:19:30 [Note] /usr/libexec/mysqld: Shutdown complete
150214 00:19:30 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
150214 00:21:52 mysqld_safe Starting mysqld daemon with databases from /data/mysql
150214 0:21:52 [Warning] Can't create test file /data/mysql/localhost.lower-test
150214 0:21:52 [Warning] Can't create test file /data/mysql/localhost.lower-test
/usr/libexec/mysqld: File './mysql-bin.index' not found (Errcode: 13)
150214 0:21:52 [ERROR] Aborting
150214 0:21:52 [Note] /usr/libexec/mysqld: Shutdown complete
提示./mysql-bin.index无法找到（由于mysql开启了bin日志功能），到数据库根目录查看该文件是存在的，可能是文件权限的问题，查看了数据库根目录的权限是700，所有者和用户组都是root，可能是上次转移数据库的时候不小心修改了文件夹的权限。
解决方法：
chown -R mysql.mysql /data/mysql
重启还是报一样的错，各种折腾，最后定位问题selinux害死人……
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