mysql master-slave replication setup

.env

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

.gitignore

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+.DS_Store
+.idea
+data

README.md

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

build.sh

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+#!/bin/bash
+
+docker-compose down
+rm -rf ./master/data/*
+rm -rf ./slave/data/*
+docker-compose build
+docker-compose up -d
+
+until docker exec mysql_master sh -c 'export MYSQL_PWD=111; mysql -u root -e ";"'
+do
+    echo "Waiting for mysql_master database connection..."
+    sleep 4
+done
+
+priv_stmt='GRANT REPLICATION SLAVE ON *.* TO "mydb_slave_user"@"%" IDENTIFIED BY "mydb_slave_pwd"; FLUSH PRIVILEGES;'
+docker exec mysql_master sh -c "export MYSQL_PWD=111; mysql -u root -e '$priv_stmt'"
+
+until docker-compose exec mysql_slave sh -c 'export MYSQL_PWD=111; mysql -u root -e ";"'
+do
+    echo "Waiting for mysql_slave database connection..."
+    sleep 4
+done
+
+docker-ip() {
+    docker inspect --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' "$@"
+}
+
+MS_STATUS=`docker exec mysql_master sh -c 'export MYSQL_PWD=111; mysql -u root -e "SHOW MASTER STATUS"'`
+CURRENT_LOG=`echo $MS_STATUS | awk '{print $6}'`
+CURRENT_POS=`echo $MS_STATUS | awk '{print $7}'`
+
+start_slave_stmt="CHANGE MASTER TO MASTER_HOST='$(docker-ip mysql_master)',MASTER_USER='mydb_slave_user',MASTER_PASSWORD='mydb_slave_pwd',MASTER_LOG_FILE='$CURRENT_LOG',MASTER_LOG_POS=$CURRENT_POS; START SLAVE;"
+start_slave_cmd='export MYSQL_PWD=111; mysql -u root -e "'
+start_slave_cmd+="$start_slave_stmt"
+start_slave_cmd+='"'
+docker exec mysql_slave sh -c "$start_slave_cmd"
+
+docker exec mysql_slave sh -c "export MYSQL_PWD=111; mysql -u root -e 'SHOW SLAVE STATUS \G'"

docker-compose.yml

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+version: '3'
+services:
+  mysql_master:
+#    image: mysql:5.7
+    build:
+      context: ./master
+    env_file:
+      - ./master/mysql_master.env
+    container_name: "mysql_master"
+    restart: "no"
+    ports:
+      - 4406:4406
+    volumes:
+      - ./master/conf/mysql.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
+      - ./master/data:/var/lib/mysql
+    networks:
+      - overlay
+
+  mysql_slave:
+    image: mysql:5.7
+    env_file:
+      - ./slave/mysql_slave.env
+    container_name: "mysql_slave"
+    restart: "no"
+    ports:
+      - 5506:5506
+    volumes:
+      - ./slave/conf/mysql.conf.cnf:/etc/mysql/conf.d/mysql.conf.cnf
+      - ./slave/data:/var/lib/mysql
+    networks:
+      - overlay
+
+networks:
+  overlay:
+

master/Dockerfile

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+# see https://hub.docker.com/_/mysql/
+
+FROM mysql:5.7
+
+# RUN mysql -u root -e "GRANT REPLICATION SLAVE ON *.* TO 'mydb_slave_user'@'%' IDENTIFIED BY 'mydb_slave_pwd'; FLUSH PRIVILEGES;"

master/conf/mysql.conf.cnf

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+[mysqld]
+
+skip-host-cache
+skip-name-resolve
+
+server-id = 1
+log_bin = /var/log/mysql/mysql-bin.log
+binlog_format = ROW
+binlog_do_db = mydb

master/mysql_master.env

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+# Note, by default mysql root does not have a password. You need to restart a server to bring MYSQL_ROOT_PASSWORD working. Use "docker-compose restart" command.
+MYSQL_ROOT_PASSWORD=111
+MYSQL_PORT=4406
+MYSQL_USER=mydb_user
+MYSQL_PASSWORD=mydb_pwd
+MYSQL_DATABASE=mydb
+MYSQL_LOWER_CASE_TABLE_NAMES=0

slave/conf/mysql.conf.cnf

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+[mysqld]
+
+skip-host-cache
+skip-name-resolve
+
+server-id=2
+relay-log = /var/log/mysql/mysql-relay-bin.log
+log_bin = /var/log/mysql/mysql-bin.log
+binlog_do_db = mydb

slave/mysql_slave.env

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+# Note, by default mysql root does not have a password. You need to restart a server to bring MYSQL_ROOT_PASSWORD working. Use "docker-compose restart" command.
+MYSQL_ROOT_PASSWORD=111
+MYSQL_PORT=5506
+MYSQL_USER=mydb_slave_user
+MYSQL_PASSWORD=mydb_slave_pwd
+MYSQL_DATABASE=mydb
+MYSQL_LOWER_CASE_TABLE_NAMES=0