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MySQL master-slave presentation
- In a production environment, a single-node database is very dangerous, in case of failure of our data can not be recovered. This article describes Docker build MySQL-5.7-based cross-host data backup
Ready to work
- First, create a cross-host overlay network, but not the junior partner Click here to view the network
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
The bottom sgis what we based swarmcreation of overlaynetwork
- View
nodenode
[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
We can see that in addition to the gpu03node as well as sanganga node, then we create a node in gpu03 mysql-masterservice, sangang node creation mysql-slaveservice
Create a mysql-master service
- Create several directories under the directory docker
[root@gpu03 docker]# ls
conf data docker-compose.yml init-d
- Create an environment variable file .env
[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
- Create a my.cnf file
[root@gpu03 docker]# vim conf/my.cnf
[mysqld]
server-id=1
log-bin=mysql-bin
- Create a file init-master.sh
[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
- Create a 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=${MYSQL_ROOT_PASSWORD}
- TZ=Asia/Shanghai
ports:
- "3339:3306"
networks:
- sg
volumes:
- ./conf/my.cnf:/etc/my.cnf
- ./data:/var/lib/mysql
- ./init-d/init-master.sh:/docker-entrypoint-initdb.d/1-init-master.sh
networks:
sg:
external: true
- start up
docker-compose up -d - View Log
docker logs -f mysql-master
Create a mysql-slave service
- Create several directories under the docker directory -
[root@sangang docker]# ls
conf data docker-compose.yml init-d
- Create an environment variable file .env
[root@sangang docker]# vim .env
MYSQL_ROOT_PASSWORD=root
MYSQL_MASTER_SERVICE_NAME=mysql-master
MYSQL_MASTER_SERVICE_USER=sangang
MYSQL_MASTER_SERVICE_PASSWORD=sangang
MYSQL_MASTER_SERVICE_POST=3306
- Create a my.cnf file
[root@sangang docker]# vim conf/my.cnf
[mysqld]
## 设置server_id,注意要唯一
server-id=101
## 开启二进制日志功能，以备Slave作为其它Slave的Master时使用
log-bin=mysql-slave-bin
## relay_log配置中继日志
relay_log=edu-mysql-relay-bin
- Create a file init-salve.sh
[root@sangang docker]# vim init-d/init-slave.sh
#!/bin/bash
mysql -uroot -p$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
- Create a 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=${MYSQL_ROOT_PASSWORD}
- TZ=Asia/Shanghai
ports:
- "3306:3306"
networks:
- sg
volumes:
- ./conf/my.cnf:/etc/my.cnf
- ./data:/var/lib/mysql
- ./init-d/init-slave.sh:/docker-entrypoint-initdb.d/1-init-slave.sh
networks:
sg:
external: true
- start up
docker-compose up -d - View Log
docker logs -f mysql-slave - Log in to view the mysql-slave state
sangang@sangang:~/docker$ 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
We can see the following two properties are Yes, indicating a success
- Slave_IO_Running:
Yes - Slave_SQL_Running:
Yes
verification
- Login mysql-master and create a database
[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>
- Log in to view the mysql-slave database
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>
- We can see mysql-slave libraries exist
结束
