Kafka: listing consumer groups

List  the consumer groups:

#kubectl -n kafka exec -ti my-cluster-kafka-0 -- bin/kafka-consumer-groups.sh --bootstrap-server my-cluster-kafka-bootstrap.kafka:9092 --list

Delete a consumer group:

Bring down dispatcher and controller, if any.

#kubectl -n knative-eventing scale deployment kafka-ch-dispatcher --replicas=0

#kubectl -n knative-eventing scale deployment kafka-ch-controller --replicas=0

Now remove the group by name:

 kubectl -n kafka exec -ti my-cluster-kafka-0 -- bin/kafka-consumer-groups.sh --bootstrap-server my-cluster-kafka-bootstrap.kafka:9092 --delete --group kafka.dx-test.default-kne-trigger.05719b03-3117-4633-b504-dc4020423ce0

Delete all consumer groups:

kubectl -n kafka exec -ti my-cluster-kafka-0 -- bin/kafka-consumer-groups.sh --bootstrap-server my-cluster-kafka-bootstrap.kafka:9092 --delete --all-groups

Describe a consumer group:

#kubectl -n kafka exec -ti my-cluster-kafka-0 -- bin/kafka-consumer-groups.sh --bootstrap-server my-cluster-kafka-bootstrap.kafka:9092 --describe --group kafka.dx-test.default-kne-trigger.3a796074-afb6-4862-a5f3-0db6c76b41d0

#xargs -0 -n 1 kubectl -n kafka exec -ti my-cluster-kafka-0 -- bin/kafka-consumer-groups.sh --bootstrap-server my-cluster-kafka-bootstrap.kafka:9092 --describe --group < <(tr \\n \\0 <consumer-grps-dangling-2.txt)