Docker搭建MySQL跨主機主從複製

MySQL主從介紹

• 在生產環境中，數據庫單節點非常危險，萬一出現故障我們的數據就無法恢復。本文介紹基於Docker Swarm搭建MySQL-5.7跨主機數據備份

準備工作

• 首先創建跨主機overlay網絡，不懂小夥伴點擊這裏，查看網絡docker network ls

[root@gpu03 docker]# docker network ls
NETWORK ID          NAME                            DRIVER              SCOPE
d0f2d68382d9        bridge                          bridge              local
b519d6da2092        docker_default                  bridge              local
ec949a93ee57        host                            host                local
kvt9ibn4tua4        ingress                         overlay             swarm
a93c3b19194a        none                            null                local
1fx2olvzn3os        sg                              overlay             swarm

最下面的sg就是我們基於swarm創建的overlay網絡

• 查看node節點

[root@gpu03 docker]# docker node ls
ID                            HOSTNAME            STATUS              AVAILABILITY        MANAGER STATUS      ENGINE VERSION
sflpfedy8d3qrbt4izkmezq2g *   gpu03               Ready               Active              Leader              19.03.2
ae2swiz3fhd2ma3yeure5s72h     sangang             Ready               Active                                  19.03.8

可以看到除了我們的gpu03節點還有sangang節點，接下來我們在gpu03節點創建mysql-master服務，sangang節點創建mysql-slave服務

創建mysql-master服務

• 在docker目錄下創建幾個目錄

[root@gpu03 docker]# ls
conf  data  docker-compose.yml  init-d

• 創建環境變量.env文件

[root@gpu03 docker]# vim .env
MYSQL_ROOT_PASSWORD=root
MYSQL_MASTER_SERVICE_NAME=mysql-master
MYSQL_MASTER_SERVICE_USER=sangang
MYSQL_MASTER_SERVICE_PASSWORD=sangang
MYSQL_MASTER_SERVICE_POST=3306

• 創建my.cnf文件

[root@gpu03 docker]# vim conf/my.cnf
[mysqld]
server-id=1
log-bin=mysql-bin

• 創建init-master.sh文件

[root@gpu03 docker]# vim init-d/init-master.sh
#!/bin/bash
mysql -uroot -p$MYSQL_ROOT_PASSWORD << EOF
CREATE USER '$MYSQL_MASTER_SERVICE_USER'@'%' IDENTIFIED BY '$MYSQL_MASTER_SERVICE_PASSWORD';
GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO '$MYSQL_MASTER_SERVICE_USER'@'%';
EOF

• 創建docker-compose.yml

[root@gpu03 docker]# vim docker-compose.yml
version: '3'
services:
  mysql-master:
    image: mysql:5.7
    container_name: mysql-master
    restart: always
    env_file:
      - .env
    environment:
      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - TZ=Asia/Shanghai
    ports:
      - "3339:3306"
    networks:
      - sg
    volumes:
      - ./conf/my.cnf:/etc/my.cnf
      - ./data:/var/lib/mysql
      - ./init-d/init-master.sh:/docker-entrypoint-initdb.d/1-init-master.sh

networks:
  sg:
    external: true

• 啓動docker-compose up -d
• 查看日誌docker logs -f mysql-master

創建mysql-slave服務

• 在docker目錄下創建幾個目錄–

[root@sangang docker]# ls
conf  data  docker-compose.yml  init-d

• 創建環境變量.env文件

[root@sangang docker]# vim .env
MYSQL_ROOT_PASSWORD=root
MYSQL_MASTER_SERVICE_NAME=mysql-master
MYSQL_MASTER_SERVICE_USER=sangang
MYSQL_MASTER_SERVICE_PASSWORD=sangang
MYSQL_MASTER_SERVICE_POST=3306

• 創建my.cnf文件

[root@sangang docker]# vim conf/my.cnf
[mysqld]
## 設置server_id,注意要唯一
server-id=101
## 開啓二進制日誌功能，以備Slave作爲其它Slave的Master時使用
log-bin=mysql-slave-bin
## relay_log配置中繼日誌
relay_log=edu-mysql-relay-bin

• 創建init-salve.sh文件

[root@sangang docker]# vim init-d/init-slave.sh
#!/bin/bash
mysql -uroot -p$MYSQL_ROOT_PASSWORD << EOF
change master to master_host='$MYSQL_MASTER_SERVICE_NAME',master_user='$MYSQL_MASTER_SERVICE_USER', master_password='$MYSQL_MASTER_SERVICE_PASSWORD',master_port=$MYSQL_MASTER_SERVICE_POST;
start slave;
EOF

• 創建docker-compose.yml

[root@sangang docker]# vim docker-compose.yml
version: '3'
services:
  mysql-master:
    image: mysql:5.7
    container_name: mysql-slave
    restart: always
    env_file:
      - .env
    environment:
      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
      - TZ=Asia/Shanghai
    ports:
      - "3306:3306"
    networks:
      - sg
    volumes:
      - ./conf/my.cnf:/etc/my.cnf
      - ./data:/var/lib/mysql
      - ./init-d/init-slave.sh:/docker-entrypoint-initdb.d/1-init-slave.sh

networks:
  sg:
    external: true

• 啓動docker-compose up -d
• 查看日誌docker logs -f mysql-slave
• 登錄mysql-slave查看狀態

sangang@sangang:~/docker$ docker exec -it mysql-slave bash
root@417cbe900756:/# mysql -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.7.29-log MySQL Community Server (GPL)

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: mysql-master
                  Master_User: sangang
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 316
               Relay_Log_File: edu-mysql-relay-bin.000006
                Relay_Log_Pos: 529
        Relay_Master_Log_File: mysql-bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

可以看到下面兩個屬性是Yes,說明成功了

• Slave_IO_Running: Yes
• Slave_SQL_Running: Yes

驗證

• 登錄mysql-master並創建數據庫

[root@gpu03 docker]# docker exec -it mysql-master bash
root@3f61cceebbab:/# mysql -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.29-log MySQL Community Server (GPL)

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
4 rows in set (0.00 sec)

mysql> create database video;
Query OK, 1 row affected (0.01 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| video              |
+--------------------+
5 rows in set (0.00 sec)

mysql> 

• 登錄mysql-slave查看數據庫

sangang@sangang:~/docker$ docker exec -it mysql-slave bash
root@417cbe900756:/# mysql -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.7.29-log MySQL Community Server (GPL)

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
| video              |
+--------------------+
5 rows in set (0.07 sec)

mysql> 

• 可以看到mysql-slave庫也存在了
• 結束