There are bugs with the IPv6DualStack feature flag in 1.17/4.4 even in single-stack clusters. Bug 1794376 removed it from openshift/api and updated cluster-kube-apiserver-operator but didn't update machine-config-operator so we were still setting that flag for kubelet
*** Bug 1809373 has been marked as a duplicate of this bug. ***
verified on 4.5.0-0.nightly-2020-03-12-003015 $ oc get nodes -o name | xargs -I % sh -c 'oc debug % -- chroot /host cat /etc/kubernetes/kubelet.conf' Starting pod/ip-10-0-138-110us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 authentication: x509: clientCAFile: /etc/kubernetes/kubelet-ca.crt anonymous: enabled: false cgroupDriver: systemd cgroupRoot: / clusterDNS: - 172.30.0.10 clusterDomain: cluster.local containerLogMaxSize: 50Mi maxPods: 250 kubeAPIQPS: 50 kubeAPIBurst: 100 rotateCertificates: true runtimeCgroups: /system.slice/crio.service serializeImagePulls: false staticPodPath: /etc/kubernetes/manifests systemCgroups: /system.slice systemReserved: cpu: 500m memory: 1Gi ephemeral-storage: 1Gi featureGates: LegacyNodeRoleBehavior: false NodeDisruptionExclusion: true RotateKubeletServerCertificate: true SCTPSupport: true ServiceNodeExclusion: true SupportPodPidsLimit: true serverTLSBootstrap: true Removing debug pod ... Starting pod/ip-10-0-140-57us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 authentication: x509: clientCAFile: /etc/kubernetes/kubelet-ca.crt anonymous: enabled: false cgroupDriver: systemd cgroupRoot: / clusterDNS: - 172.30.0.10 clusterDomain: cluster.local containerLogMaxSize: 50Mi maxPods: 250 kubeAPIQPS: 50 kubeAPIBurst: 100 rotateCertificates: true runtimeCgroups: /system.slice/crio.service serializeImagePulls: false staticPodPath: /etc/kubernetes/manifests systemCgroups: /system.slice systemReserved: cpu: 500m memory: 1Gi ephemeral-storage: 1Gi featureGates: LegacyNodeRoleBehavior: false NodeDisruptionExclusion: true RotateKubeletServerCertificate: true SCTPSupport: true ServiceNodeExclusion: true SupportPodPidsLimit: true serverTLSBootstrap: true Removing debug pod ... Starting pod/ip-10-0-153-163us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 authentication: x509: clientCAFile: /etc/kubernetes/kubelet-ca.crt anonymous: enabled: false cgroupDriver: systemd cgroupRoot: / clusterDNS: - 172.30.0.10 clusterDomain: cluster.local containerLogMaxSize: 50Mi maxPods: 250 kubeAPIQPS: 50 kubeAPIBurst: 100 rotateCertificates: true runtimeCgroups: /system.slice/crio.service serializeImagePulls: false staticPodPath: /etc/kubernetes/manifests systemCgroups: /system.slice systemReserved: cpu: 500m memory: 1Gi ephemeral-storage: 1Gi featureGates: LegacyNodeRoleBehavior: false NodeDisruptionExclusion: true RotateKubeletServerCertificate: true SCTPSupport: true ServiceNodeExclusion: true SupportPodPidsLimit: true serverTLSBootstrap: true Removing debug pod ... Starting pod/ip-10-0-156-184us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 authentication: x509: clientCAFile: /etc/kubernetes/kubelet-ca.crt anonymous: enabled: false cgroupDriver: systemd cgroupRoot: / clusterDNS: - 172.30.0.10 clusterDomain: cluster.local containerLogMaxSize: 50Mi maxPods: 250 kubeAPIQPS: 50 kubeAPIBurst: 100 rotateCertificates: true runtimeCgroups: /system.slice/crio.service serializeImagePulls: false staticPodPath: /etc/kubernetes/manifests systemCgroups: /system.slice systemReserved: cpu: 500m memory: 1Gi ephemeral-storage: 1Gi featureGates: LegacyNodeRoleBehavior: false NodeDisruptionExclusion: true RotateKubeletServerCertificate: true SCTPSupport: true ServiceNodeExclusion: true SupportPodPidsLimit: true serverTLSBootstrap: true Removing debug pod ... Starting pod/ip-10-0-160-192us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 authentication: x509: clientCAFile: /etc/kubernetes/kubelet-ca.crt anonymous: enabled: false cgroupDriver: systemd cgroupRoot: / clusterDNS: - 172.30.0.10 clusterDomain: cluster.local containerLogMaxSize: 50Mi maxPods: 250 kubeAPIQPS: 50 kubeAPIBurst: 100 rotateCertificates: true runtimeCgroups: /system.slice/crio.service serializeImagePulls: false staticPodPath: /etc/kubernetes/manifests systemCgroups: /system.slice systemReserved: cpu: 500m memory: 1Gi ephemeral-storage: 1Gi featureGates: LegacyNodeRoleBehavior: false NodeDisruptionExclusion: true RotateKubeletServerCertificate: true SCTPSupport: true ServiceNodeExclusion: true SupportPodPidsLimit: true serverTLSBootstrap: true Removing debug pod ... Starting pod/ip-10-0-169-102us-west-2computeinternal-debug ... To use host binaries, run `chroot /host` kind: KubeletConfiguration apiVersion: kubelet.config.k8s.io/v1beta1 authentication: x509: clientCAFile: /etc/kubernetes/kubelet-ca.crt anonymous: enabled: false cgroupDriver: systemd cgroupRoot: / clusterDNS: - 172.30.0.10 clusterDomain: cluster.local containerLogMaxSize: 50Mi maxPods: 250 kubeAPIQPS: 50 kubeAPIBurst: 100 rotateCertificates: true runtimeCgroups: /system.slice/crio.service serializeImagePulls: false staticPodPath: /etc/kubernetes/manifests systemCgroups: /system.slice systemReserved: cpu: 500m memory: 1Gi ephemeral-storage: 1Gi featureGates: LegacyNodeRoleBehavior: false NodeDisruptionExclusion: true RotateKubeletServerCertificate: true SCTPSupport: true ServiceNodeExclusion: true SupportPodPidsLimit: true serverTLSBootstrap: true Removing debug pod ...
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 (OpenShift Container Platform 4.5 image release 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