1.7 KiB
| title | visible |
|---|---|
| MariaDB Replication | true |
[toc]
Master Slave Setup
Master Configuration
The MariaDB Server has to be accessible from outside. For Debian, one has to comment bind-address=127.0.0.1 in the file /etc/mysql/mariadb.conf.d/50-server.cnf.
If you have any firewall enabled, make sure to allow port 3306/TCP.
Add this segment at the end of /etc/mysql/my.cnf
[mariadb]
log-bin
server_id=1
log-basename=master
binlog-format=mixed
Restart mariadb now
Create a replication user
CREATE USER 'replication'@'%' IDENTIFIED BY '<password>';
GRANT REPLICATION SLAVE ON *.* TO 'replication'@'%';
Next we have to get the data necessary so the slave knows where to start replicating.
FLUSH TABLES WITH READ LOCK;
SHOW MASTER STATUS;
Do not close this session, keep it running until you have made the backup from the next step
# mysqldump -u root -p (db name) > db_name.sql
You can unlock the database again.
UNLOCK TABLES;
Slave Configuration
Edit your /etc/mysql/my.cnf file
Make sure to choose different IDs for every host
[mysqld]
server-id = 2
Create the database and restore the sql dumps made earlier.
# mysql -u root -p (db name) < db_name.sql
Set the database master now
CHANGE MASTER TO
MASTER_HOST='<domain>',
MASTER_USER='replication',
MASTER_PASSWORD='<password>',
MASTER_PORT=3306,
MASTER_LOG_FILE='<master log file>',
MASTER_LOG_POS=<master log position>,
MASTER_CONNECT_RETRY=10,
MASTER_USE_GTID = slave_pos;
Start slave now
START SLAVE;
And check the status
SHOW SLAVE STATUS \G
If both of the following options say yes, everything is working as intended
Slave_IO_Running: Yes
Slave_SQL_Running: Yes