centos7 xtrabackup mysql 基本测试（4）---虚拟机环境 mysql 修改datadir（有问题）

centos7 xtrabackup mysql 基本测试（4）—虚拟机环境 mysql 修改datadir

参考
centos更改mysql数据库目录
https://blog.youkuaiyun.com/sinat_33151213/article/details/125079593

https://blog.youkuaiyun.com/jx_ZhangZhaoxuan/article/details/129139499

https://dev.mysql.com/doc/refman/8.4/en/selinux-file-context.html

https://developer.aliyun.com/article/1238771

创建目录

sudo mkdir -p /opt/datadir/

首先，关闭MySQL服务：

sudo systemctl stop mysqld
sudo systemctl status  mysqld

然后，复制原始datadir目录，作为新的目录：
sudo cp -rp /var/lib/mysql /opt/datadir/
sudo ls /opt/datadir/mysql/

接下来，修改 MySQL配置文件my.cnf：
sudo cp /etc/my.cnf /etc/org_my.cnf
sudo vi /etc/my.cnf

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
#
# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
# innodb_buffer_pool_size = 128M
#
# Remove leading # to turn on a very important data integrity option: logging
<