CentOS 7下mysql 8修改datadir之后提示权限问

背景

之前默认安装mysql的时候安装在系统盘，生成binlog的时候导致系统盘空间不足，需要把mysql移动到其它盘。

操作

1、停止 MySQL 8.0 服务，使用下面的指令

service mysqld stop

2、将默认的数据目录移至目标位置

mv /var/lib/mysql/ /home/

3、建立软连接

ln -s /home/mysql /var/lib/

4、启动服务

service mysqld start

问题

出现下面的错误

[root@localhost /]# systemctl mysqld start
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.
[root@localhost /]# systemctl status mysqld.service
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since 日 2020-06-14 22:13:45 CST; 1min 16s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 19271 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS (code=exited, status=1/FAILURE)
  Process: 19241 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 19271 (code=exited, status=1/FAILURE)
   Status: "Server startup in progress"
    Error: 13 (权限不够)
6月 14 22:13:43 localhost.localdomain systemd[1]: Starting MySQL Server...
6月 14 22:13:45 localhost.localdomain systemd[1]: mysqld.service: main process exited, code=exited, status=1/FAILURE
6月 14 22:13:45 localhost.localdomain systemd[1]: Failed to start MySQL Server.
6月 14 22:13:45 localhost.localdomain systemd[1]: Unit mysqld.service entered failed state.
6月 14 22:13:45 localhost.localdomain systemd[1]: mysqld.service failed.

尝试修改/home/mysql的文件权限

chown -R mysql.mysql /home/mysql

还是出现上面的错误

解决

需要将Selinux临时关闭才能启动成功：

[root@localhost /]# setenforce 0 
[root@localhost /]# systemctl start mysqld