Kubernetes 1.19 Release Notes

Resource Changes and Deprecations

Kubernetes v1.19 Release Notes

• vSphere in-tree volumes can be migrated to vSphere CSI drivers. The in-tree vSphere Volume plugin is no longer used and will be deleted in later versions.
• apiextensions.k8s.io/v1beta1 has been deprecated. You are advised to use apiextensions.k8s.io/v1.
• apiregistration.k8s.io/v1beta1 has been deprecated. You are advised to use apiregistration.k8s.io/v1.
• authentication.k8s.io/v1beta1 and authorization.k8s.io/v1beta1 have been deprecated and will be removed from Kubernetes 1.22. You are advised to use authentication.k8s.io/v1 and authorization.k8s.io/v1.
• autoscaling/v2beta1 has been deprecated. You are advised to use autoscaling/v2beta2.
• coordination.k8s.io/v1beta1 has been deprecated in Kubernetes 1.19 and will be removed from version 1.22. You are advised to use coordination.k8s.io/v1.
• kube-apiserver: The componentstatus API has been deprecated.
• kubeadm: The kubeadm config view command has been deprecated and will be deleted in later versions. Use kubectl get cm -o yaml -n kube-system kubeadm-config to directly obtain the kubeadm configuration.
• kubeadm: The kubeadm alpha kubelet config enable-dynamic command has been deprecated.
• kubeadm: The --use-api flag in the kubeadm alpha certs renew command has been deprecated.
• Kubernetes no longer supports hyperkube image creation.
• The --export flag is removed from the kubectl get command.
• The alpha feature ResourceLimitsPriorityFunction has been deleted.
• storage.k8s.io/v1beta1 has been deprecated. You are advised to use storage.k8s.io/v1.

Kubernetes v1.18 Release Notes

• kube-apiserver
  • All resources in the apps/v1beta1 and apps/v1beta2 API versions are no longer served. You can use the apps/v1 API version.
  • DaemonSets, Deployments, and ReplicaSets in the extensions/v1beta1 API version are no longer served. You can use the apps/v1 API version.
  • NetworkPolicies in the extensions/v1beta1 API version are no longer served. You can use the networking.k8s.io/v1 API version.
  • PodSecurityPolicies in the extensions/v1beta1 API version are no longer served. Migrate to use the policy/v1beta1 API version.

• kubelet
  • --redirect-container-streaming is not recommended and will be deprecated in v1.20.
  • The resource measurement endpoint /metrics/resource/v1alpha1 and all measurement standards under this endpoint have been deprecated. Use the measurement standards under the endpoint /metrics/resource instead:
    • scrape_error --> scrape_error
    • node_cpu_usage_seconds_total --> node_cpu_usage_seconds
    • node_memory_working_set_bytes --> node_memory_working_set_bytes
    • container_cpu_usage_seconds_total --> container_cpu_usage_seconds
    • container_memory_working_set_bytes --> container_memory_working_set_bytes
    • scrape_error --> scrape_error
  • In future releases, kubelet will no longer create the target directory CSI NodePublishVolume according to the CSI specifications. You may need to update the CSI driver accordingly to correctly create and process the target path.

• kube-proxy
  • You are not advised to use the --healthz-port and --metrics-port flags. Use --healthz-bind-address and --metrics-bind-address instead.
  • The EndpointSliceProxying function option is added to control the use of EndpointSlices in kube-proxy. This function is disabled by default.

• kubeadm
  • The --kubelet-version flag of kubeadm upgrade node has been deprecated and will be deleted in later versions.
  • The --use-api flag in the kubeadm alpha certs renew command has been deprecated.
  • kube-dns has been deprecated and will no longer be supported in future versions.
  • The ClusterStatus structure in the kubeadm-config ConfigMap has been deprecated and will be deleted in later versions.

• kubectl
  • You are not advised to use boolean and unset values for --dry-run. server|client|none is used in the new version.
  • --server-dry-run has been deprecated for kubectl apply and replaced by --dry-run=server.

• add-ons

The cluster-monitoring add-on is deleted.

• kube-scheduler
  • The scheduling_duration_seconds metric has been deprecated.
  • The scheduling_algorithm_predicate_evaluation_seconds and scheduling_algorithm_priority_evaluation_seconds counters metrics are no longer used and are replaced by framework_extension_point_duration_seconds[extension_point="Filter"] and framework_extension_point_duration_seconds[extension_point="Score"].
  • The scheduler policy AlwaysCheckAllPredictes has been deprecated.

• Other changes
  • The k8s.io/node-api component is no longer updated. Instead, you can use the RuntimeClass type in k8s.io/api and the generated clients in k8s.io/client-go.
  • The client label has been deleted from apiserver_request_total.

References

For more details about the performance comparison and function evolution between Kubernetes 1.19 and other versions, see the following documents:

• Kubernetes v1.19.0 Release Notes
• Kubernetes v1.18.0 Release Notes