What is Galera arbitrator?
Galera Arbitrator is a member of a cluster that participates in voting, but not in the actual replication. Galera Arbitrator serves two purposes: When you have an even number of nodes, it functions as an odd node, to avoid split-brain situations.
How Galera replication works?
Galera Cluster is a synchronous multi-master replication plug-in for InnoDB. An application can write to any node in a Galera cluster, and transaction commits (row-based replication events) are then applied on all servers, via a certification-based replication.
How do I stop Galera Cluster?
How to do it…
- Ensure that any applications using the cluster are shut down.
- On db03 , run the following command to check whether the node is up to date:
- If the value is synced, run the following command to shut down the node:
- On db02 and db01 , repeat the same steps, first on db02 , and then on db01 .
How do I set up Galera?
- Step 1 – Create an Atlantic.Net Cloud Server. First, log in to your Atlantic.Net Cloud Server.
- Step 2 – Install MariaDB Server on All Servers.
- Step 3 – Configure Each Server in the Cluster.
- Step 4 – Initialize the Galera Cluster.
- Step 5 – Test Galera Cluster Replication.
Do you need a server for Galera arbitrator?
Galera Arbitrator does not need a dedicated server. It can be installed on a machine running some other application. Just make sure it has good network connectivity. Galera Arbitrator is a member of the cluster that participates in the voting, but not in actual replication (although it receives the same data as other nodes).
When to use Galera arbitrator in Percona cluster?
Galera Arbitrator is a member of Percona XtraDB Cluster that is used for voting in case you have a small number of servers (usually two) and don’t want to add any more resources. Galera Arbitrator does not need a dedicated server.
How to configure Galera arbitrator using sudo statement?
How you configure Galera Arbitrator depends on how you start it. That is to say, whether it runs from the shell or as a service. These two methods are described in the next two sections. When Galera Arbitrator starts, the script executes a sudo statement as the user nobody during its process.
How to set up Galera arbitrator on CentOS / RHEL?
To configure Galera Arbitrator on Ubuntu/Debian you need to edit the /etc/default/garb file. On CentOS/RHEL configuration can be found in /etc/sysconfig/garb file. Configuration file should look like this after installation: