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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.
Why is my MariaDB Galera Cluster not starting?
I’m trying to install a new galera cluster. The primary host started fine, but the secondaries are failing during the state transfer with rsync, and are not starting. I haven’t been able to fix the problem
Where are the neccesary ports in Galera MariaDB?
All neccesary ports (3306,4444,4567,4568) are mounted and are opened in the firewalld.
What kind of cluster is used for synchronous replication?
Galera Cluster, with its (virtually) synchronous replication, is commonly used in many different types of environments. Scaling it by adding new nodes is not hard (or just as simple a couple of clicks when you use ClusterControl ).
Is it safe to mix old and New Galera nodes?
You cannot move some of the production traffic to such test system, this is because the data is not current. Finally, the migration itself. Again, what we said earlier, even if it is possible to mix old and new versions of Galera nodes in the same cluster, it is not the safest way to do it.
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.
How many MariaDB 10.3 nodes are there?
Our cluster consists of three MariaDB 10.3 nodes, we also deployed ProxySQL to do the read-write split and distribute the traffic across all nodes in the cluster. This is not a production-grade deployment, for that we would have to deploy more ProxySQL nodes and a Keepalived on top of them. It is still enough for our purposes.
Can a Master cluster be affected by a slave cluster?
There is no flow control, thus the performance of the “master” cluster will not be affected by the performance of the “slave” cluster. As with every asynchronous replication, a lag may show up, but as long as it stays within acceptable limits, it can work perfectly fine.