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ubuntu24.04 用apt安装的mysql修改存储路径（文件夹、目录）

环境

ubuntu24.04，mysql8.0。安装方式apt install安装的。

先默认配置下登录并查看MySQL当前的数据目录

登录

mysql -u root -p

查看数据目录

show global variables like "%datadir%";

当前目录

mysql> show global variables like "%datadir%";
+---------------+-------------------+
| Variable_name | Value             |
+---------------+-------------------+
| datadir       | /var/lib/mysql    |
+---------------+-------------------+
1 row in set (0.00 sec)

修改目录目录

nano /etc/mysql/my.cnf

改成

!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/mysql.conf.d/[mysqld]
datadir=/data/mysql/data

新建并复制数据文件夹内容

systemctl stop mysql
mkdir -p /data/mysql
cp -R /var/lib/mysql 

修改权限为mysql

cd /var/lib/mysql
chown mysql:mysql -R data

启动mysql试试

$ systemctl start mysqlJob for mysql.service failed because the control process exited with error code.
See "systemctl status mysql.service" and "journalctl -xeu mysql.service" for details.

此时无法启动mysql，还需改mysql的访问权

修改访问权限

修改usr.sbin.mysqld

nano /etc/apparmor.d/usr.sbin.mysqld

找到Allow data dir access段并添加/data/mysql/** rwk

# Allow data dir access/var/lib/mysql/ r,/var/lib/mysql/** rwk,/data/mysql/** rwk,

保存后重启apparmor

systemctl restart apparmor

再启动mysql

systemctl start mysql

成功启动

验证

查看数据目录

show global variables like "%datadir%";

当前目录

mysql> show global variables like "%datadir%";
+---------------+-------------------+
| Variable_name | Value             |
+---------------+-------------------+
| datadir       | /data/mysql/data  |
+---------------+-------------------+
1 row in set (0.00 sec)