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How to get started with MariaDB Galera Cluster?
In MariaDB 10.1 and later, the MySQL-wsrep patch has been merged into MariaDB Server. This means that the functionality of MariaDB Galera Cluster can be obtained by installing the standard MariaDB Server packages and the Galera wsrep provider library package.
Which is MariaDB cluster supports InnoDB Storage Engine?
MariaDB Galera Cluster is a virtually synchronous multi-primary cluster for MariaDB. It is available on Linux only, and only supports the InnoDB storage engine (although there is experimental support for MyISAM and, from MariaDB 10.6, Aria. See the wsrep_replicate_myisam system variable, or, from MariaDB 10.6, the wsrep_mode system variable).
Which is MySQL patch does MariaDB Galera use?
In MariaDB 10.4 and later, MariaDB Galera Cluster uses Galera 4. This means that the MySQL-wsrep patch is version 26 and the Galera wsrep provider library is version 4. In MariaDB 10.3 and before, MariaDB Galera Cluster uses Galera 3. This means that the MySQL-wsrep patch is version 25 and the Galera wsrep provider library is version 3.
When does Galera refuse to bootstrap a node?
Bootstrapping the first node solves this problem. In some cases Galera will refuse to bootstrap a node if it detects that it might not be the most advanced node in the cluster. Galera makes this determination if the node was not the last one in the cluster to be shut down or if the node crashed.
Do you need more memory for MariaDB Galera?
During normal operation a MariaDB Galera node does not consume much more memory than a regular MariaDB server. Additional memory is consumed for the certification index and uncommitted writesets, but normally this should not be noticeable in a typical application. There is one exception though:
How to setup asynchronous replication between MariaDB clusters?
As this is a Galera cluster, you want to have ‘wsrep_gtid_domain_id’ configured and ‘wsrep_gtid_mode’ enabled. Those settings will ensure that GTID’s will be generated for the traffic coming from the Galera cluster. More information can be found in the documentation. Once this is all done, you can proceed with setting up the second cluster.