一、背景
原数据库数据目录：/data/mysql3306/data，日志文件目录：/data/mysql3306/binlog
变更后数据库目录：/mysqldata/3306/data，日志文件目录：/mysqldata/3306/binlog
二、操作过程
1、创建测试数据，并停止原库
[root@node02 data]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.18 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> create database testdb;
Query OK, 1 row affected (0.08 sec)
mysql> use testdb;
Database changed
mysql> create table test (id int);
Query OK, 0 rows affected (0.12 sec)
mysql> insert into test values (10);
Query OK, 1 row affected (0.18 sec)
mysql> use testdb;
Database changed
mysql> show tables;
+------------------+
| Tables_in_testdb |
+------------------+
| test |
+------------------+
1 row in set (0.01 sec)
mysql> select * from test;
+------+
| id |
+------+
| 10 |
+------+
1 row in set (0.00 sec)
[root@node02 data]# /etc/init.d/mysqld stop
Shutting down MySQL.. SUCCESS!
2、拷贝数据目录
[root@node02 data]# cp -a /data/mysql3306/data/testdb* /mysqldata/3306/data/
[root@node02 data]# cp -a /data/mysql3306/data/mysql* /mysqldata/3306/data/
[root@node02 data]# cp -a /data/mysql3306/data/ibdata1 /mysqldata/3306/data/
3、修改参数文件
原参数文件：
[client]
port=3306
socket=/tmp/mysql.sock
[mysqld]
port=3306
user=mysql
server_id=2
socket=/tmp/mysql.sock
basedir=/usr/local/mysql
datadir=/data/mysql3306/data
log-error=/data/mysql3306/data/error.log
log_bin=/data/mysql3306/binlog/mysql-bin
gtid_mode=ON
enforce_gtid_consistency=ON
log_slave_updates=1
修改后参数文件：
[client]
port=3306
socket=/tmp/mysql.sock
[mysqld]
port=3306
user=mysql
server_id=2
socket=/tmp/mysql.sock
basedir=/usr/local/mysql
datadir=/mysqldata/3306/data
log-error=/mysqldata/3306/data/error.log
log_bin=/mysqldata/3306/binlog/mysql-bin
gtid_mode=ON
enforce_gtid_consistency=ON
log_slave_updates=1
4、启动数据库
[root@node02 data]# /etc/init.d/mysqld start
Starting MySQL.Logging to '/mysqldata/3306/data/error.log'.
.. SUCCESS!
三、登录数据库验证
[root@node02 data]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.18 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> show variables like 'datadir';
+---------------+-----------------------+
| Variable_name | Value |
+---------------+-----------------------+
| datadir | /mysqldata/3306/data/ |
+---------------+-----------------------+
1 row in set (0.11 sec)
mysql> show variables like '%log_bin%';
+---------------------------------+----------------------------------------+
| Variable_name | Value |
+---------------------------------+----------------------------------------+
| log_bin | ON |
| log_bin_basename | /mysqldata/3306/binlog/mysql-bin |
| log_bin_index | /mysqldata/3306/binlog/mysql-bin.index |
| log_bin_trust_function_creators | OFF |
| log_bin_use_v1_row_events | OFF |
| sql_log_bin | ON |
+---------------------------------+----------------------------------------+
6 rows in set (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| testdb |
+--------------------+
5 rows in set (0.01 sec)
mysql> use testdb;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+------------------+
| Tables_in_testdb |
+------------------+
| test |
+------------------+
1 row in set (0.00 sec)
mysql> select * from test;
+------+
| id |
+------+
| 10 |
+------+
1 row in set (0.00 sec)
