HA NATS Configuration for Deployment

NATS Repo: https://nats-io.github.io/k8s/helm/charts/

Chart Version: 0.11.0

Values File:

YAML

cluster:
  enabled: true
  noAdvertise: true
natsbox:
  enabled: true
nats:
  jetstream:
    enabled: true
    memStorage:
      enabled: true
      size: 1Gi

    fileStorage:
      enabled: true
      size: 1Gi
      storageDirectory: /data/
      
auth:
  enabled: true
  basic:
    accounts:
      A:
        users:
        - user: a
          password: a
      B:
        jetstream: true // if you want to enable jetstream for this user. This is required for the user used by the notifier
        users:
        - user: b
          password: b

We additionally use the ClusterIP service so that the load-balancing aspect is working well. We did not find proper documentation to show that the service that the chart already uses works well in that aspect.

CODE

apiVersion: v1
kind: Service
metadata:
  name: nats-svc
  namespace: thub
spec:
  type: ClusterIP
  selector:
    app.kubernetes.io/name: nats
  ports:
    - protocol: TCP
      port: 4222
      targetPort: 4222
      name: nats
    - protocol: TCP
      port: 8222
      targetPort: 8222
      name: monitoring

This allows us to use the DNS from Kubernetes to access the cluster with the service URL. We are additionally exposing port 8222 to obtain the monitoring information.