kube-apiserver connects to etcd on 127.0.0.1 and on ::1.
Verified with OCP 4.5.0-0.nightly-2020-03-10-234440, kubeapiserver_pod=$(oc get pod -n openshift-kube-apiserver | grep kube-apiserver | head -1 | awk '{print $1}') oc rsh -n openshift-kube-apiserver $kubeapiserver_pod in pod, cat /etc/kubernetes/static-pod-resources/configmaps/config/config.yaml | python -m json.tool Checking "storageConfig": { "ca": "/etc/kubernetes/static-pod-resources/configmaps/etcd-serving-ca/ca-bundle.crt", "certFile": "/etc/kubernetes/static-pod-resources/secrets/etcd-client/tls.crt", "keyFile": "/etc/kubernetes/static-pod-resources/secrets/etcd-client/tls.key", "urls": [ "https://...133.130:2379", "https://...0.159.59:2379", "https://...0.161.145:2379", "https://localhost:2379" ] }, There should not has the ipv6 endpoint "https://[::1]:2379".
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:2409