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