k8s-proxysql-cluster

Container to run proxysql in cluster mode in kubernetes.

Usage

By default te the container acts as a normal proxysql instance. To enable cluster mode the following is needed.

the container uses a service to discover if there are already master nodes up. This service can be found in

/k8s/proxysql.service.yaml

use the following command to use the service in kubernetes

kubectl create -f ./k8s/proxysql.service.yaml

To deploy the actual nodes a statefulset should be added to the kubernetes cluster This statefulset can be found in

/k8s/proxysql.statefulset.yaml

use the following command to use the statefulset in kubernetes

kubectl create -f ./k8s/proxysql.statefulset.yaml

When the container is run with the --k8s-cluster argument the following happens:

the container checks if there is a node available at the proxysql service
If no node is available this container becomes the first master node of the cluster
- The node deletes the proxysql server from the proxysql_servers table
- The node adds its own ip to its proxysql_servers table
Else the node wil join the existing master nodes
- The node's proxysql_servers table is synced with that of the existing master nodes
- The node adds its own ip to the proxysql_servers table of the node exposed by the proxysql service.
- The node deletes the proxysql service from the proxysql_servers table
The cluster is up and running!