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‎.env

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# default environment variables https://docs.docker.com/compose/env-file/

‎.gitignore

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.DS_Store
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.idea
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data

‎README.md

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Docker MySQL master-slave replication
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========================
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docker-compose构建 mysql 主从复制(读写分离)集群
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MySQL master-slave replication with using Docker.
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## Run
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To run this examples you will need to start containers with "docker-compose"
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and after starting setup replication. See commands inside ./build.sh.
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#### Create 2 MySQL containers with master-slave row-based replication
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```
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./build.sh
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```
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#### Make changes to master
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```
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docker exec mysql_master sh -c "export MYSQL_PWD=111; mysql -u root mydb -e 'create table code(code int); insert into code values (100), (200)'"
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```
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#### Read changes from slave
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```
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docker exec mysql_slave sh -c "export MYSQL_PWD=111; mysql -u root mydb -e 'select * from code \G'"
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```
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```
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docker exec mysql_slave2 sh -c "export MYSQL_PWD=111; mysql -u root mydb -e 'select * from code \G'"
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```
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## Troubleshooting
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#### Check Logs
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```
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docker-compose logs
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```
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#### Start containers in "normal" mode
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> Go through "build.sh" and run command step-by-step.
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#### Check running containers
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```
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docker-compose ps
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```
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#### Clean data dir
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```
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rm -rf ./master/data/*
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rm -rf ./slave/data/*
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rm -rf ./slave2/data/*
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```
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#### Run command inside "mysql_master"
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```
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docker exec mysql_master sh -c 'mysql -u root -p111 -e "SHOW MASTER STATUS \G"'
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```
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#### Run command inside "mysql_slave"
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```
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docker exec mysql_slave sh -c 'mysql -u root -p111 -e "SHOW SLAVE STATUS \G"'
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```
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```
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docker exec mysql_slave2 sh -c 'mysql -u root -p111 -e "SHOW SLAVE STATUS \G"'
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```
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#### Enter into "mysql_master"
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```
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docker exec -it mysql_master bash
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```
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#### Enter into "mysql_slave"
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```
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docker exec -it mysql_slave bash
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```
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```
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docker exec -it mysql_slave2 bash
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```

‎build.sh

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#!/bin/bash
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#################### 变量定义 ####################
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mysql_user="mydb_slave_user" # 主服务器允许从服务器登录的用户名
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mysql_password="mydb_slave_pwd" # 主服务器允许从服务器登录的密码
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root_password="111" # 每台服务器的root密码
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# 主库列表
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master_container=mysql_master
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# 从库列表
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slave_containers=(mysql_slave mysql_slave2)
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# 所有的数据库集群列表
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all_containers=($master_container ${slave_containers[@]})
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#################### 函数定义 ####################
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# 获取服务器的ip
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docker-ip() {
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docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$@"
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}
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#################### docker-compose初始化 ####################
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docker-compose down
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rm -rf ./master/data/*
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rm -rf ./slave/data/*
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rm -rf ./slave2/data/*
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docker-compose build
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docker-compose up -d
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#################### 服务器初始化操作 ####################
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# 这个操作的目的是尝试连接服务器, 如果连接失败, 就等待4s后重试, 直到等待mysql服务器就绪, 并且连接上为止
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for container in ${all_containers[@]};do
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until docker exec $container sh -c 'export MYSQL_PWD='$root_password'; mysql -u root -e ";"'
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do
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echo "Waiting for mysql_master database connection..."
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sleep 4
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done
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done
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#################### 主服务器操作 ####################开始
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# 在主服务器上添加数据库用户
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priv_stmt='GRANT REPLICATION SLAVE ON *.* TO "'$mysql_user'"@"%" IDENTIFIED BY "'$mysql_password'"; FLUSH PRIVILEGES;'
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docker exec $master_container sh -c "export MYSQL_PWD='$root_password'; mysql -u root -e '$priv_stmt'"
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# 查看主服务器的状态
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MS_STATUS=`docker exec $master_container sh -c 'export MYSQL_PWD='$root_password'; mysql -u root -e "SHOW MASTER STATUS"'`
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# binlog文件名字,对应 File 字段,值如: mysql-bin.000004
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CURRENT_LOG=`echo $MS_STATUS | awk '{print $6}'`
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# binlog位置,对应 Position 字段,值如: 1429
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CURRENT_POS=`echo $MS_STATUS | awk '{print $7}'`
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#################### 从服务器操作 ####################开始
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# 设置从服务器与主服务器互通命令
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start_slave_stmt="CHANGE MASTER TO
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MASTER_HOST='$(docker-ip $master_container)',
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MASTER_USER='$mysql_user',
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MASTER_PASSWORD='$mysql_password',
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MASTER_LOG_FILE='$CURRENT_LOG',
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MASTER_LOG_POS=$CURRENT_POS;"
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start_slave_cmd='export MYSQL_PWD='$root_password'; mysql -u root -e "'
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start_slave_cmd+="$start_slave_stmt"
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start_slave_cmd+='START SLAVE;"'
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# 执行从服务器与主服务器互通
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for slave in ${slave_containers[@]};do
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# 从服务器连接主互通
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docker exec $slave sh -c "$start_slave_cmd"
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# 查看从服务器得状态
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docker exec $slave sh -c "export MYSQL_PWD='$root_password'; mysql -u root -e 'SHOW SLAVE STATUS \G'"
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done
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‎docker-compose.yml

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version: '3'
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services:
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mysql_master:
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image: mysql:5.7
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env_file:
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- ./master/mysql_master.env
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container_name: "mysql_master"
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restart: "no"
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ports:
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- 4406:3306
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volumes:
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- ./master/conf/mysql.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
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- ./master/data:/var/lib/mysql
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networks:
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- overlay
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mysql_slave:
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image: mysql:5.7
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env_file:
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- ./slave/mysql_slave.env
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name: kye1
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address: key2
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container_name: "mysql_slave"
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restart: "no"
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ports:
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- 5506:3306
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depends_on:
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- mysql_master
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volumes:
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- ./slave/conf/mysql.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
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- ./slave/data:/var/lib/mysql
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networks:
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- overlay
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mysql_slave2:
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image: mysql:5.7
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env_file:
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- ./slave2/mysql_slave.env
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container_name: "mysql_slave2"
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restart: "no"
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ports:
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- 5507:3306
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depends_on:
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- mysql_master
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volumes:
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- ./slave2/conf/mysql.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
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- ./slave2/data:/var/lib/mysql
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networks:
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- overlay
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networks:
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overlay:
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‎master/conf/mysql.conf.cnf

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[mysqld]
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skip-host-cache
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skip-name-resolve
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server-id = 11
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log_bin = /var/log/mysql/mysql-bin.log
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binlog_format = ROW
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binlog_do_db = mydb

‎master/mysql_master.env

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# Note, by default mysql root does not have a password.
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# You need to restart a server to bring MYSQL_ROOT_PASSWORD working.
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# Use "docker-compose restart" command.
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MYSQL_ROOT_PASSWORD=111
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MYSQL_PORT=3306
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# 数据库配置
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MYSQL_USER=mydb_slave_user
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MYSQL_PASSWORD=mydb_slave_pwd
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MYSQL_DATABASE=mydb
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# 设置为大小写不敏感
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MYSQL_LOWER_CASE_TABLE_NAMES=0

‎slave/conf/mysql.conf.cnf

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[mysqld]
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skip-host-cache
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skip-name-resolve
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server-id=21
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relay-log = /var/log/mysql/mysql-relay-bin.log
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log_bin = /var/log/mysql/mysql-bin.log
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binlog_do_db = mydb

‎slave/mysql_slave.env

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# Note, by default mysql root does not have a password.
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# You need to restart a server to bring MYSQL_ROOT_PASSWORD working.
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# Use "docker-compose restart" command.
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MYSQL_ROOT_PASSWORD=111
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MYSQL_PORT=3306
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# 数据库配置
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MYSQL_USER=mydb_slave_user
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MYSQL_PASSWORD=mydb_slave_pwd
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MYSQL_DATABASE=mydb
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# 设置为大小写不敏感
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MYSQL_LOWER_CASE_TABLE_NAMES=0

‎slave2/conf/mysql.conf.cnf

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[mysqld]
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skip-host-cache
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skip-name-resolve
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server-id=22
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relay-log = /var/log/mysql/mysql-relay-bin.log
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log_bin = /var/log/mysql/mysql-bin.log
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binlog_do_db = mydb

‎slave2/mysql_slave.env

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# Note, by default mysql root does not have a password.
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# You need to restart a server to bring MYSQL_ROOT_PASSWORD working.
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# Use "docker-compose restart" command.
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MYSQL_ROOT_PASSWORD=111
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MYSQL_PORT=3306
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# 数据库配置
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MYSQL_USER=mydb_slave_user
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MYSQL_PASSWORD=mydb_slave_pwd
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MYSQL_DATABASE=mydb
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# 设置为大小写不敏感
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MYSQL_LOWER_CASE_TABLE_NAMES=0

‎test.sh

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#!/bin/bash
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releases=('AAA' 'BBB' ccc)
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for release in ${releases[@]};do
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echo $release
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done

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