今天启动mysql时出现了如下错误：
[root@host1 /]# service mysql start
Starting MySQL.. ERROR! The server quit without updating PID file (/var/lib/mysql/host1.pid).
查看错误日志：
[root@host1 /]# cat /var/log/mysqld.err | less
-- :: [ERROR] MYSQL_BIN_LOG::open_purge_index_file failed to open register file.
-- :: [ERROR] MYSQL_BIN_LOG::open_index_file failed to sync the index file.
-- :: [ERROR] Aborting
经排查，原因是文件权限在复制移动时被改动到了，属权限的问题，执行：
[root@host1 /]# chown -R mysql:mysql /var/lib/mysql/ [root@host1 /]# service mysql start
Starting MySQL.. SUCCESS!
问题成功解决。