docker搭建mysql主从同步的全过程

# 拉取镜像,自己配一下docker镜像源，几十秒就下完了
docker pull mysql:8.0
# 创建容器之间的通信网络
docker network create mysql_db
### 启动主库
docker run -p 3340:3306 --name mysql-m --network mysql_db -e MYSQL_ROOT_PASSWORD=主库root密码 -d mysql:8.0
### 启动从库
docker run -p 3341:3306 --name mysql-s --network mysql_db -e MYSQL_ROOT_PASSWORD=从库root密码 -d mysql:8.0

CREATE USER `slave`@`%` IDENTIFIED WITH mysql_native_password BY '123456';
# 授权
GRANT REPLICATION SLAVE ON *.* TO  'slave'@'%' identified by '123456';
# 检查一下
show grants for 'slave'@'%';
# 没有的话刷新一下
flush PRIVILEGES;

# 修改主库配置
docker exec -it mysql-m   /bin/bash
# 这里需要安装一下vim
apt-get update
apt-get install vim
vim /etc/mysql/my.cnf

#1.配置server-id 保证同一网络中不重复，其实就普通的主从配置一样了
#2.开启logbin 主从同步其实就是读取binlog的过程
[mysqld]
server-id=101
log-bin=mysql-bin

# 修改从库配置
docker exec -it mysql-s /bin/bash
vim /etc/mysql/my.cnf
# 配置server-id log-bin和relay-log 
# mysql会将变化写入relaylog 从库来读取relaylog做同步
[mysqld]
server-id=102
log-bin=mysql-slave-bin
relay-log=mysql-relay-bin

CHANGE MASTER TO master_host = '172.17.0.2', master_user = 'slave', master_password = '123456', master_port = 3306, master_log_file = 'mysql-bin.000002', master_log_pos = 1894, master_connect_retry = 30;