Delete the operator

In case you want to delete the Koperator from your cluster, note that because of dependencies between the various components, they must be deleted in specific order.

Uninstall Koperator

1. Delete the Prometheus instance used by the Kafka cluster. If you used the sample Prometheus instance from the Koperator repository you can use the following command, otherwise do this step manually according to the way you deployed the Prometheus instance.

   kubectl delete \
       -n kafka \
       -f https://raw.githubusercontent.com/banzaicloud/koperator/0.25.1/config/samples/kafkacluster-prometheus.yaml
   

   Expected output:

   clusterrole.rbac.authorization.k8s.io/prometheus deleted
   clusterrolebinding.rbac.authorization.k8s.io/prometheus deleted
   prometheus.monitoring.coreos.com/kafka-prometheus deleted
   prometheusrule.monitoring.coreos.com/kafka-alerts deleted
   serviceaccount/prometheus deleted
   servicemonitor.monitoring.coreos.com/cruisecontrol-servicemonitor deleted
   servicemonitor.monitoring.coreos.com/kafka-servicemonitor deleted
   

2. Delete KafkaCluster Custom Resource (CR) that represent the Kafka cluster and Cruise Control.

   kubectl delete kafkaclusters -n kafka kafka
   

   Example output:

   kafkacluster.kafka.banzaicloud.io/kafka deleted
   

   Wait for the Kafka resources (Pods, PersistentVolumeClaims, Configmaps, etc) to be removed.

   kubectl get pods -n kafka
   

   Expected output:

   NAME                                       READY   STATUS    RESTARTS   AGE
   kafka-operator-operator-8458b45587-286f9   2/2     Running   0          62s
   

   You would also need to delete other Koperator-managed CRs (if any) following the same fashion

   Note: KafkaCluster, KafkaTopic and KafkaUser custom resources are protected with Kubernetes finalizers, so those won’t be actually deleted from Kubernetes until the Koperator removes those finalizers. After the Koperator has finished cleaning up everything, it removes the finalizers. In case you delete the Koperator deployment before it cleans up everything, you need to remove the finalizers manually.

3. Uninstall Koperator deployment.

   helm uninstall kafka-operator -n kafka
   

   Expected output:

   release "kafka-operator" uninstalled
   

4. Delete Koperator Custom Resource Definitions (CRDs).

   kubectl delete -f https://github.com/banzaicloud/koperator/releases/download/v0.25.1/kafka-operator.crds.yaml
   

Uninstall Prometheus operator

1. Uninstall the prometheus-operator deployment.

   helm uninstall -n prometheus prometheus
   

   Expected output:

   release "prometheus" uninstalled
   

2. If no other cluster resources uses prometheus-operator CRDs, delete the prometheus-operator’s CRDs.

   Note: Red Hat OpenShift clusters require those CRDs to function so do not delete those on such clusters.

   kubectl get crd | grep 'monitoring.coreos.com'| awk '{print $1};' | xargs kubectl delete crd
   

Uninstall Zookeeper Operator

1. Delete Zookeeper CR.

   kubectl delete zookeeperclusters -n zookeeper zookeeper-server
   

   Expected output:

   zookeeperclusters.zookeeper.pravega.io/zookeeper-server deleted
   

   Wait for the Zookeeper resources (Deployment, PersistentVolumeClaims, Configmaps, etc) to be removed.

   kubectl get pods -n zookeeper
   

   Expected output:

   NAME                                  READY   STATUS    RESTARTS   AGE
   zookeeper-operator-5857967dcc-gm5l5   1/1     Running   0          3m22s
   

2. Uninstall the zookeeper-operator deployment.

   helm uninstall zookeeper-operator -n zookeeper
   

3. If no other cluster resource uses Zookeeper CRDs, delete Zookeeper Operator’s CRDs

   kubectl delete customresourcedefinition zookeeperclusters.zookeeper.pravega.io
   

Uninstall Cert-Manager

Uninstall with Helm

1. Uninstall cert-manager deployment.

   helm uninstall -n cert-manager cert-manager
   

   Expected output:

   release "cert-manager" uninstalled
   

2. If no other cluster resource uses cert-manager CRDs, delete cert-manager’s CRDs:

   kubectl delete -f https://github.com/jetstack/cert-manager/releases/download/v1.11.0/cert-manager.crds.yaml
   

   Expected output:

   customresourcedefinition.apiextensions.k8s.io/certificaterequests.cert-manager.io deleted
   customresourcedefinition.apiextensions.k8s.io/certificates.cert-manager.io deleted
   customresourcedefinition.apiextensions.k8s.io/challenges.acme.cert-manager.io deleted
   customresourcedefinition.apiextensions.k8s.io/clusterissuers.cert-manager.io deleted
   customresourcedefinition.apiextensions.k8s.io/issuers.cert-manager.io deleted
   customresourcedefinition.apiextensions.k8s.io/orders.acme.cert-manager.io deleted