MacOS使用Docker创建MySQL主从数据库的方法

[mysqld]
server_id = 1
log-bin= mysql-bin
read-only=0
replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema

[mysqld]
server_id = 2
log-bin= mysql-bin
read-only=1
replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema

mysql> use mysql
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> select host from user where user='root';
+-----------+
| host      |
+-----------+
| localhost |
+-----------+
1 row in set (0.01 sec)

mysql> update user set host='%' where user = 'root';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select host from user where user='root';
+------+
| host |
+------+
| %    |
+------+
1 row in set (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

//进入master主数据容器
docker exec -it mysql-master mysql -uroot -p123456
//创建一个用户来同步数据，每个slave使用标准的MySQL用户名和密码连接master。进行复制操作的用户会授予REPLICATION SLAVE 权限。mysql8 之前的版本中加密规则是mysql_native_password,而在mysql8之后,加密规则是caching_sha2_password
CREATE USER 'slave'@'%' IDENTIFIED BY '123456';（这样有可能在slave创建与master连接时报错）
或
CREATE USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
//对用户进行授权
GRANT REPLICATION SLAVE ON *.* to 'slave'@'%';
//查看状态，记住File、Position的值，在Slave中将用到
show master status;
//查询master容器的IP，会在slave设置主库连接时用到
docker inspect mysql-master | grep IPA;

//进入slave从数据容器
docker exec -it mysql-slave mysql -uroot -p123456
//设置主库链接 change master to
change master to master_host='172.17.0.2',master_user='slave',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=661,master_port=3306;
//启动从库同步
start slave;
//查看状态
show slave status\G;
//如果 show slave status\G命令结果中出现：
//Slave_IO_Running: Yes
//Slave_SQL_Running: Yes
//以上两项都为Yes，那说明没问题了。
//否则，从新配置从数据
stop slave;
reset slave all;

create database master_slave_demo;
use master_slave_demo;
create table userinfo(username varchar(50),age int);
insert into userinfo values('Toulon',25);
select * from userinfo;