himanshug commented on issue #9496: druid management ui in kubernetes fails if more than one coordinator/overlord process URL: https://github.com/apache/druid/issues/9496#issuecomment-598355639 you can't point to service, druid(actually zookeeper client) needs to have all of zookeeper hosts individually listed like it is done in non-k8s deployments as well. if you deployed zookeeper using a stateful set, make sure to add `serviceName` (as in https://github.com/druid-io/druid-operator/blob/master/examples/tiny-cluster-zk.yaml#L29 ) in the StatefulSet is the magic attribute that sets `spec.subdomain` in launched pods which in turn leads to k8s cluster dns resolving fulling qualified zk pods names e.g. "tiny-cluster-zk-0.tiny-cluster-zk, tiny-cluster-zk-1.tiny-cluster-zk .. etc" https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/#pod-s-hostname-and-subdomain-fields doc describes same for pods. Note: you might have to make your service a "headless service" but it might work with non-headless service as well so try that first, make sure "nslookup <fully qualified zk pod name>" works on all druid pods. See https://github.com/kubernetes/website/pull/16376
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