Upgrade HiveMQ version along with k8s operator latest version

Prerequisites:

1. k8s version 1.16+ is installed

2. Helm version 3 is installed

3. Hivemq k8s operator repo is already added in helm repo

Expected Result:

Upgrade hivemq version without downtime. Hivemq version 4.6.4 should be running without error using k8s operator version 0.9.2

Steps to follow:

Hivemq cluster values file:

operator values file: 

monitoring:
  enabled: true
operator:
  admissionWebhooks:
    enabled: false
    failurePolicy: Fail
  deployCr: false
  logLevel: DEBUG

1. Deploy Hivemq operator with 0.8.7

   1. helm upgrade --install -f operator.yaml <release name> hivemq/hivemq-operator —version 0.8.7

2. Apply Hivemq cluster with hivemq 4.6.2

   1. Kubectl apply -f <hivemq cluster.yaml>

3. Simply apply the new CRD using the following command (considering k8s version is 1.16+)

   1. kubectl apply -f https://raw.githubusercontent.com/hivemq/helm-charts/prerelease-4.6.4/charts/hivemq-operator/crds/hivemq-cluster.yaml

4. Scale operator to 0 so it doesn’t immediately reconcile. This will only remove the operator pod, but leave the HiveMQ nodes as remaining

   1. kubectl scale —replicas=0 deployment <operator name>

5. Edit hivemq cluster yaml to update the hivemq version as 4.6.4

6. Apply the changes

   1. Kubectl apply -f <hivemq cluster.yaml>

7. check the pods status(no errors)

   1. kubectl get pods

8. Update operaor version i.e 0.9.2 in cluster(operator config File)

9. Run following command for rolling upgrade

   1. helm upgrade --install -f operator.yaml <release name> hivemq/hivemq-operator —version 0.9.2