Question

我使用MySQL 5.7和CentOS 7.2。

首先，我在my.cnf中的datadir配置是/ var / lib / mysql

现在我要更改datadir。

我hava尝试两种方式：

首先，我将/ var / lib / mysql中的所有文件和目录复制到/ home / data，然后运行chown -R mysql:mysql /home/data。但是当我运行systemctl start mysqld时，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，我将/ var / lib / mysql移动到/ home并在/ var / lib目录中运行ln -s /home/mysql mysql。当我运行systemctl start mysqld时，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？

Answer 1

这个问题与subdir权限有关你应该编辑这个文件/etc/apparmor.d/local/usr.sbin.mysqld /data/ r, /data/** rwk, 别忘了，你应该在centos找到相同的命令，比如这个

sudo service apparmor reload

关于ubuntu sys的这个问题，请参阅链接

https://askubuntu.com/questions/758898/mysql-wont-start-after-changing-the-datadir-14-04-mysql-5-7/795710#795710

快乐的一天，baddy

MySQL 5.7更改datadir

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