How to setup asynchronous replication between Galera clusters?
Once the Galera Cluster is deployed, simply pick one node on each site to set up the asynchronous replication link. Take note that ALL Galera nodes must be configured with binary logging and log_slave_updates enabled. Enabling GTID is highly recommended, although not compulsory. On all nodes, configure with the following parameters inside my.cnf: ?
How to enable binary logging in Galera Cluster?
If you are using ClusterControl, from the web interface, pick Nodes -> the chosen Galera node -> Enable Binary Logging. You might then have to change the server-id on the DR site manually to make sure every node is holding a distinct server-id value.
How does Galera Cluster support strong data consistency?
Galera Cluster enforces strong data consistency, where all nodes in the cluster are tightly coupled. Although network segmentation is supported, replication performance is still bound by two factors:
What happens if MySQL Galera Cluster goes down?
The executed GTID set should have 2 sets of GTID at this point, one from all transactions executed on the old master and the other for the new master. If the primary cluster goes down, crashes, or simply loses connectivity from the application standpoint, the application can be directed to the DR site instantly.
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.
How does Galera replication work with MySQL replication?
Both Galera replication and MySQL replication exist in the same server software independently. We can make use of these technologies to work together, where all replication within a datacenter will be on Galera while inter-datacenter replication will be on standard MySQL Replication.
Do you have to replicate to all nodes in a cluster?
Any write executed on a cluster has to be replicated to all of the nodes and certified on them. If, for whatever reason, this process slows down, it can seriously impact the cluster’s ability to accommodate writes.