本文主要是使用署简化mysql主从搭建，同时给需要学习mysql主从的自动同学一个现成的环境。

1. 编写master.sh脚本

此脚本主要是化部根据环境变量，创建出用于主从同步的集群用户。关于为什么要创建出master,使用署slave脚本，是自动为了区分master和slave环境，因为只要把sql和sh文件放到master目录下面，化部master在第一次初始化的集群时候，会自动执行里面的使用署文件内容

复制mkdir -p init init/master init/slave cat > init/master/master.sh <<EOF #!/bin/bash #定义用于同步的用户名 MASTER_SYNC_USER=\${MASTER_SYNC_USER:-sync_admin} #定义用于同步的用户密码 MASTER_SYNC_PASSWORD=\${MASTER_SYNC_PASSWORD:-123456} #定义用于登录mysql的用户名 ADMIN_USER=\${ADMIN_USER:-root} #定义用于登录mysql的用户密码 ADMIN_PASSWORD=\${ADMIN_PASSWORD:-123456} #定义运行登录的host地址 ALLOW_HOST=\${ALLOW_HOST:-%} #定义创建账号的sql语句 CREATE_USER_SQL="CREATE USER \$MASTER_SYNC_USER@\$ALLOW_HOST IDENTIFIED BY \$MASTER_SYNC_PASSWORD;" #定义赋予同步账号权限的亿华云sql,这里设置两个权限，REPLICATION SLAVE，自动属于从节点副本的化部权限，REPLICATION CLIENT是集群副本客户端的权限，可以执行show master status语句 GRANT_PRIVILEGES_SQL="GRANT SELECT,使用署REPLICATION SLAVE,REPLICATION CLIENT ON *.* TO \$MASTER_SYNC_USER@\$ALLOW_HOST;" #定义刷新权限的sql FLUSH_PRIVILEGES_SQL="FLUSH PRIVILEGES;" #执行sql mysql -u"\$ADMIN_USER" -p"\$ADMIN_PASSWORD" -e "\$CREATE_USER_SQL \$GRANT_PRIVILEGES_SQL \$FLUSH_PRIVILEGES_SQL" EOF1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22. 2. 编写slave.sh脚本

slave主要是去master查询最新的pos位置和binlog文件名称，然后创建同步需要的自动相关信息，然后执行start slave;

复制cat >init/slave/slave.sh<<EOF #定义连接master进行同步的化部账号 SLAVE_SYNC_USER="\${SLAVE_SYNC_USER:-sync_admin}" #定义连接master进行同步的账号密码 SLAVE_SYNC_PASSWORD="\${SLAVE_SYNC_PASSWORD:-123456}" #定义slave数据库账号 ADMIN_USER="\${ADMIN_USER:-root}" #定义slave数据库密码 ADMIN_PASSWORD="\${ADMIN_PASSWORD:-123456}" #定义连接master数据库host地址 MASTER_HOST="\${MASTER_HOST:-%}" #连接master数据库，查询二进制数据，并解析出logfile和pos，这里同步用户要开启 REPLICATION CLIENT权限，才能使用SHOW MASTER STATUS; RESULT=\`mysql -u"\$SLAVE_SYNC_USER" -h\$MASTER_HOST -p"\$SLAVE_SYNC_PASSWORD" -e "SHOW MASTER STATUS;" | grep -v grep |tail -n +2| awk {print $1,$2}\` #解析出logfile LOG_FILE_NAME=\`echo \$RESULT | grep -v grep | awk {print $1}\` #解析出pos LOG_FILE_POS=\`echo \$RESULT | grep -v grep | awk {print $2}\` #设置连接master的同步相关信息 SYNC_SQL="change master to master_host=\$MASTER_HOST,master_user=\$SLAVE_SYNC_USER,master_password=\$SLAVE_SYNC_PASSWORD,master_log_file=\$LOG_FILE_NAME,master_log_pos=\$LOG_FILE_POS,get_master_public_key=1;" #开启同步 START_SYNC_SQL="start slave;" #查看同步状态 STATUS_SQL="show slave status\G;" mysql -u"\$ADMIN_USER" -p"\$ADMIN_PASSWORD" -e "\$SYNC_SQL \$START_SYNC_SQL \$STATUS_SQL" EOF1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25. 3. 编写docker-compose.yml脚本 复制version: 3 services: master: image: mysql:8 container_name: mysql-master ports: - 3306:3306 restart: always hostname: mysql-master environment: MYSQL_ROOT_PASSWORD: "123456" MASTER_SYNC_USER: "sync" MASTER_SYNC_PASSWORD: "123456" ADMIN_USER: "root" ADMIN_PASSWORD: "123456" TZ: "Asia/Shanghai" deploy: resources: limits: memory: 512M cpus: 50m healthcheck: test: ["CMD","mysqladmin","-uroot","-p$${MYSQL_ROOT_PASSWORD}","ping","-h","localhost"] timeout: 2s interval: 10s retries: 5 start_period: 5s logging: options: max-file: 1 max-size: 128k command: - "--server-id=1" - "--character-set-server=utf8mb4" - "--collation-server=utf8mb4_unicode_ci" - "--log-bin=mysql-bin" - "--sync_binlog=1" - "--binlog-ignore-db=mysql" - "--binlog-ignore-db=sys" - "--binlog-ignore-db=performance_schema" - "--binlog-ignore-db=information_schema" - "--sql_mode=NO_AUTO_VALUE_ON_ZERO,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION,PIPES_AS_CONCAT,ANSI_QUOTES" volumes: - ./init/master:/docker-entrypoint-initdb.d - ./data/master:/var/lib/mysql slave: image: mysql:8 container_name: mysql-slave ports: - 3307:3306 restart: always hostname: mysql-slave environment: MYSQL_ROOT_PASSWORD: "123456" SLAVE_SYNC_USER: "sync" SLAVE_SYNC_PASSWORD: "123456" ADMIN_USER: "root" ADMIN_PASSWORD: "123456" MASTER_HOST: "mysql-master" TZ: "Asia/Shanghai" healthcheck: test: ["CMD","mysqladmin","-uroot","-p$${MYSQL_ROOT_PASSWORD}","ping","-h","localhost"] timeout: 2s interval: 10s retries: 5 start_period: 5s deploy: resources: limits: memory: 512M cpus: 50m logging: options: max-file: 1 max-size: 128k depends_on: master: condition: service_healthy command: - "--server-id=2" - "--character-set-server=utf8mb4" - "--collation-server=utf8mb4_unicode_ci" - "--sql_mode=NO_AUTO_VALUE_ON_ZERO,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION,PIPES_AS_CONCAT,ANSI_QUOTES" volumes: - ./init/slave:/docker-entrypoint-initdb.d - ./data/slave:/var/lib/mysql1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.49.50.51.52.53.54.55.56.57.58.59.60.61.62.63.64.65.66.67.68.69.70.71.72.73.74.75.76.77.78.79.80.81.82.83.84.85.86.

启动脚本

复制docker-compose up -d1.

后期维护过程中可能用到的脚本

复制STOP SLAVE; RESET SLAVE; CHANGE MASTER TO master_log_pos=0; START SLAVE; SHOW SLAVE STATUS;1.2.3.4.5.

写在后面，源码下载基于docker-compose搭建mysql主从已经结束，这里主要演示了如何一键搭建mysql主从，同时测试在各种环境下，还能保证主从同步。但是单主从同步肯定也无法满足企业的需求，有兴趣的同学可以研究一些主主双写同步，然后通过nginx搭建主备模式，达到高可用。

这里提供一个判断的方法，编写#boot.sh脚本文件，这时候需要重写dockerfile文件，使用myslq debian的镜像文件。并通过apt添加netcat工具。具体不再详述了，以下为判断脚本。

复制#!/bin/bash wait_for() { echo Waiting for $1 to listen on $2... sleep 1 while ! nc -vz $1 $2 do echo waiting...; sleep 1s; done } if [ -e "/slave" ]; then echo "slave..." cp /slave.cnf /etc/mysql/conf.d/ else echo "master..." cp /master.cnf /etc/mysql/conf.d/ fi echo "master config ... " /master.sh echo "complete. " if [ -n "$MASTER_HOST" ]; then echo "replicaof $MASTER_HOST" wait_for $MASTER_HOST $MASTER_PORT /slave.sh echo "Slave config complete." fi1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.