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我使用MySQL 5.7和CentOS 7.2。MySQL 5.7更改datadir
首先，在我的my.cnf配置的datadir是/ var/lib中/ MySQL的
现在我想改变的datadir。
我哈瓦尝试两种方式：
首先，我在/ var/lib中/ MySQL的复制所有文件和目录到/ home /数据，并运行chown -R mysql:mysql /home/data。但是，当我运行systemctl start mysqld，我收到错误消息：
2016-12-08T16:33:38.206780Z 0 [ERROR] InnoDB: The innodb_system data file 'ibdata1' must be writable
2016-12-08T16:33:38.206806Z 0 [ERROR] InnoDB: The innodb_system data file 'ibdata1' must be writable
2016-12-08T16:33:38.206817Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2016-12-08T16:33:38.807398Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2016-12-08T16:33:38.807421Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2016-12-08T16:33:38.807429Z 0 [ERROR] Failed to initialize plugins.
2016-12-08T16:33:38.807436Z 0 [ERROR] Aborting
其次，我谨在/ var/lib中/ MySQL的到/ home和运行在/ var/lib目录ln -s /home/mysql mysql。当我运行systemctl start mysqld，我收到错误消息：
2016-12-08T16:48:28.958136Z 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
2016-12-08T16:48:28.958165Z 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
2016-12-08T16:48:28.958174Z 0 [ERROR] InnoDB: os_file_get_status() failed on './ibdata1'. Can't determine file permissions
2016-12-08T16:48:28.958184Z 0 [ERROR] InnoDB: Plugin initialization aborted with error Generic error
2016-12-08T16:48:29.558751Z 0 [ERROR] Plugin 'InnoDB' init function returned error.
2016-12-08T16:48:29.558792Z 0 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2016-12-08T16:48:29.558806Z 0 [ERROR] Failed to initialize plugins.
2016-12-08T16:48:29.558817Z 0 [ERROR] Aborting
我该如何处理呢？
我在Windows中有这个问题。一旦我删除了日志文件，服务就开始正常运行。 ibdata1将成为日志文件，如果你有备份删除它并尝试再次启动服务 – Rajesh
@Rajesh我试图删除所有'ib_logfile'。但它不起作用。非常感谢。 – lbear
@ibear你能解决这个问题吗？ –