Galera Monitor
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MaxScale's Galera Monitor (galeramon) monitors Galera Cluster deployments.
This page contains topics that need to be considered when designing applications that use the Galera Monitor.
Additional information is available here.
MaxScale's Galera Monitor (galeramon) monitors Galera Cluster deployments.
What Does the Galera Monitor Support?
The Galera Monitor (galeramon) supports:
Monitoring MariaDB Enterprise Cluster deployments
Monitoring MariaDB Galera Cluster deployments
Query-based load balancing with the Read/Write Split Router (readwritesplit)
Connection-based load balancing with the Read Connection Router (readconnroute)
Deploy MaxScale with Galera Monitor and Read/Write Split Router
Deploy MaxScale with Galera Monitor and Read Connection Router
MaxScale's Galera Monitor (galeramon) monitors Galera Cluster.
By default, when a node is chosen as a donor for a State Snapshot Transfer (SST), Galera Monitor does not route any queries to it. However, some SST methods are non-blocking on the donor, so this default behavior is not always desired.
A cluster's SST method is defined by the wsrep_sst_method system variable. When this system variable is set to mariadb-backup, the cluster uses MariaDB Backup to perform the SST. MariaDB Backup is a non-blocking backup method, so Galera Cluster allows the node to execute queries while acting as the SST donor.
Configure the availability of SST donors by configuring the available_when_donor parameter for the Galera Monitor in maxscale.cnf.
For example:
Restart the MaxScale instance.
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[galera-cluster]
type = monitor
module = galeramon
...
available_when_donor = true$ sudo systemctl restart maxscale