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pages/02.linux/20.mariadb-replication/default.en.md

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+---
+title: 'MariaDB Replication'
+---
+
+## 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
+```