https://github.com/tonyluo/docker-mysql-master-slave
https://github.com/tonyluo/docker-mysql-master-slave
Last synced: 3 months ago
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- Host: GitHub
- URL: https://github.com/tonyluo/docker-mysql-master-slave
- Owner: TonyLuo
- Created: 2019-07-22T06:23:30.000Z (almost 6 years ago)
- Default Branch: master
- Last Pushed: 2019-07-22T06:46:07.000Z (almost 6 years ago)
- Last Synced: 2025-01-23T22:34:26.997Z (5 months ago)
- Language: Shell
- Size: 4.88 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
This repo demonstrates how to setup a mysql master slave using docker-compose and the official mysql docker image.
For detailed article refere to http://tarunlalwani.com/post/mysql-master-slave-using-docker
#### MySQL master slave using docker
Docker makes it easy to run multiple independent mysql instances on the same machines for different projects. But some projects use a Master and slave setup of MySQL, where usually writes are directed to Master and the reads are directed to Slave.
I based my approach on tegansnyder/docker-mysql-master-slave. But what I didn’t like about the existing setup is that it assumed mysql client setup on the host. I wanted to do it using the mysql docker images itself. Also other things I wanted is that it is compatible with docker-compose as well.
So we first create a basic docker-compose.yml with two mysql instances
```
version: '2'
services:
mysqlmaster:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=root"
volumes:
- ./data/mysql-master:/var/lib/mysql/
- ./config/mysql-master:/etc/mysql/conf.d/
mysqlslave:
image: mysql:5.7
environment:
- "MYSQL_ROOT_PASSWORD=root"
volumes:
- ./data/mysql-slave:/var/lib/mysql/
- ./config/mysql-slave:/etc/mysql/conf.d/
```
Now next we need master and slave config to give server-id to the mysql instances.
config/mysql-master/master.cnf
```
[mysqld]
server-id=1
log-bin=mysql-bin
log-slave-updates=1
datadir=/var/lib/mysql/
innodb_flush_log_at_trx_commit = 2
innodb_flush_method = O_DIRECT
skip-host-cache
skip-name-resolve
```
config/mysql-slave/slave.cnf
```
[mysqld]
server-id=2
log-bin=mysql-bin
log-slave-updates=1
auto_increment_increment=2
auto_increment_offset=2
datadir=/var/lib/mysql
read-only=1
slave-skip-errors = 1062
skip-host-cache
skip-name-resolve
```
### Configuration script
Next we create a configuration shell script which we would run in an seperate image
mysql_connector.sh
```sh
#!/bin/bash
BASE_PATH=$(dirname $0)
echo "Waiting for mysql to get up"
# Give 60 seconds for master and slave to come up
sleep 60
echo "Create MySQL Servers (master / slave repl)"
echo "-----------------"
echo "* Create replication user"
mysql --host mysqlslave -uroot -p$MYSQL_SLAVE_PASSWORD -AN -e 'STOP SLAVE;';
mysql --host mysqlslave -uroot -p$MYSQL_MASTER_PASSWORD -AN -e 'RESET SLAVE ALL;';
mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -AN -e "CREATE USER '$MYSQL_REPLICATION_USER'@'%';"
mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -AN -e "GRANT REPLICATION SLAVE ON *.* TO '$MYSQL_REPLICATION_USER'@'%' IDENTIFIED BY '$MYSQL_REPLICATION_PASSWORD';"
mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -AN -e 'flush privileges;'
echo "* Set MySQL01 as master on MySQL02"
MYSQL01_Position=$(eval "mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -e 'show master status \G' | grep Position | sed -n -e 's/^.*: //p'")
MYSQL01_File=$(eval "mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -e 'show master status \G' | grep File | sed -n -e 's/^.*: //p'")
MASTER_IP=$(eval "getent hosts mysqlmaster|awk '{print \$1}'")
echo $MASTER_IP
mysql --host mysqlslave -uroot -p$MYSQL_SLAVE_PASSWORD -AN -e "CHANGE MASTER TO master_host='mysqlmaster', master_port=3306, \
master_user='$MYSQL_REPLICATION_USER', master_password='$MYSQL_REPLICATION_PASSWORD', master_log_file='$MYSQL01_File', \
master_log_pos=$MYSQL01_Position;"
echo "* Set MySQL02 as master on MySQL01"
MYSQL02_Position=$(eval "mysql --host mysqlslave -uroot -p$MYSQL_SLAVE_PASSWORD -e 'show master status \G' | grep Position | sed -n -e 's/^.*: //p'")
MYSQL02_File=$(eval "mysql --host mysqlslave -uroot -p$MYSQL_SLAVE_PASSWORD -e 'show master status \G' | grep File | sed -n -e 's/^.*: //p'")
SLAVE_IP=$(eval "getent hosts mysqlslave|awk '{print \$1}'")
echo $SLAVE_IP
mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -AN -e "CHANGE MASTER TO master_host='mysqlslave', master_port=3306, \
master_user='$MYSQL_REPLICATION_USER', master_password='$MYSQL_REPLICATION_PASSWORD', master_log_file='$MYSQL02_File', \
master_log_pos=$MYSQL02_Position;"
echo "* Start Slave on both Servers"
mysql --host mysqlslave -uroot -p$MYSQL_SLAVE_PASSWORD -AN -e "start slave;"
echo "Increase the max_connections to 2000"
mysql --host mysqlmaster -uroot -p$MYSQL_MASTER_PASSWORD -AN -e 'set GLOBAL max_connections=2000';
mysql --host mysqlslave -uroot -p$MYSQL_SLAVE_PASSWORD -AN -e 'set GLOBAL max_connections=2000';
mysql --host mysqlslave -uroot -p$MYSQL_MASTER_PASSWORD -e "show slave status \G"
echo "MySQL servers created!"
echo "--------------------"
echo
echo Variables available fo you :-
echo
echo MYSQL01_IP : mysqlmaster
echo MYSQL02_IP : mysqlslave
```
### Testing the setup
```
$ docker-compose up -d
$ docker-compose logs -f mysqlconfigure
$ docker-compose exec mysqlmaster mysql -uroot -proot -e "CREATE DATABASE test_replication;"
$ docker-compose exec mysqlslave mysql -uroot -proot -e "SHOW DATABASES;"
```
The last command produces below output showing that the replication works fine
```
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test_replication |
+--------------------+
```