mysql 8.0 改变数据目录和日志目录（二）

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)