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Update Notes of TKE Kubernetes Major Versions

Last updated: 2022-05-12 14:46:37

    Kubernetes 1.20 Changes Since 1.18

    Major updates

    New version of CronJob controller

    Kubernetes 1.20 introduces the new version of the CronJob controller, which uses the informer mechanism to replace polling, optimizing the performance. You can set --feature-gates="CronJobControllerV2=true" in kube-controller -manager to enable the new version. The new version will be enabled by default on later Kubernetes versions.

    Dockershim deprecation

    Dockershim is being deprecated. Support for Docker is deprecated and will be removed from a future release. Docker-produced images will continue to work in your cluster with all CRI compliant runtimes as Docker images follow the Open Container Initiative (OCI) image specification.
    For more information, see Don't Panic: Kubernetes and Docker and Dockershim Deprecation FAQ.

    Structured log

    The log message and Kubernetes object reference structures are standardized to make log parsing, processing, storage, query, and analysis easier. Two methods are added to klog to support structured logs: InfoS and ErrorS.
    The --logging-format parameter is added to all components, and its default value is text in the previous format. You can set it to json to support structured logs, and the following parameters will become invalid: --add_dir_header, --alsologtostderr, --log_backtrace_at, --log_dir, --log_file, --log_file_max_size, --logtostderr, --skip_headers, --skip_log_headers, --stderrthreshold, --vmodule, and --log-flush-frequency.

    Exec probe timeout handling

    A longstanding bug regarding exec probe timeouts that may impact existing Pod definitions has been fixed. Prior to this fix, the timeoutSeconds field was not respected for exec probes. Instead, probes would run indefinitely, even past their configured deadline, until a result was returned. With this change, the default value of 1 second will be applied if a value is not specified and existing Pod definitions may no longer be sufficient if a probe takes longer than one second. A feature gate, called ExecProbeTimeout, has been added with this fix that enables you to revert to the previous behavior, but this will be locked and removed in subsequent releases. In order to revert to the previous behavior, you should set this feature gate to false.
    For more information, see Configure Liveness, Readiness and Startup Probes.

    Graduation of volume snapshot operation feature to GA

    This feature provides a standard way to trigger volume snapshot operations and allows you to incorporate snapshot operations in a portable manner on any Kubernetes environment and supported storage providers.
    Additionally, these Kubernetes snapshot primitives act as basic building blocks that unlock the ability to develop advanced and enterprise-grade storage administration features for Kubernetes, including application or cluster level backup solutions.
    Note that snapshot support requires Kubernetes distributors to bundle and deploy the snapshot controller, snapshot CRDs, and validation webhook. A CSI driver supporting the snapshot feature must also be deployed in the cluster.

    Graduation of kubectl debug to beta

    The kubectl alpha debug command graduates to beta, becoming kubectl debug. It supports common debugging workflows directly from kubectl, for example:

    • Troubleshoot workloads that crash on startup by creating a copy of the Pod with a different container image or command.

    • Troubleshoot distroless containers by adding a new container with debugging tools, either in a new copy of the Pod or using an ephemeral container. (Ephemeral containers (EphemeralContainers) are an alpha feature that are not enabled by default.)

    • Troubleshoot on a node by creating a container running in the host namespaces and with access to the host's file system.
      Note that as a new built-in command, kubectl debug takes priority over any kubectl plugin named debug. You need to rename the affected plugins.
      kubectl alpha debug is now deprecated and will be removed in a subsequent release. Update your scripts to use kubectl debug. For more information, see Debug Running Pods.

      Graduation of API priority and fairness to beta

      Introduced on Kubernetes 1.18, the API priority and fairness feature is now enabled by default on Kubernetes 1.20. This allows kube-apiserver to categorize incoming requests by priority.

      Graduation of PID limits to GA

      SupportNodePidsLimit (node-to-Pod PID isolation) and SupportPodPidsLimit (ability to limit PIDs per Pod) move to GA.

      Alpha feature: Graceful node shutdown

      Users and cluster admins expect that Pods will adhere to expected Pod lifecycle, including Pod termination. Currently, when a node shuts down, Pods do not follow the expected Pod termination lifecycle and are not terminated gracefully, which may cause issues for some workloads. The GracefulNodeShutdown feature is now in alpha on Kubernetes 1.20. It makes the kubelet aware of node system shutdowns, enabling graceful termination of Pods during a system shutdown.

    Graduation of CSIVolumeFSGroupPolicy to beta

    CSIDrivers can use the fsGroupPolicy field to control whether ownership and permissions (ReadWriteOnceWithFSType, File, and None) can be modified during mounting.

    Graduation of ConfigurableFSGroupPolicy to beta

    The following can be set in a non-recursive manner: fsgroup - PodFSGroupChangePolicy = OnRootMismatch.

    Other updates

    • The Cloud Controller Manager component is added.

    • Features graduating to GA:

      • RuntimeClass
        node.k8s.io/v1beta1 is deprecated and replaced with node.k8s.io/v1.
      • Built-in API types defaults
      • StartupProbe
      • Adding AppProtocol to Services and Endpoints
      • TokenRequest and TokenRequestProjection
      • SCTPSupport
      • Containerd support for Windows
      • Ingress
        networking.k8s.io/v1beta1 is deprecated (it will be removed on Kubernetes 1.22) and replaced by networking.k8s.io/v1.
      • seccomp
        seccomp annotations seccomp.security.alpha.kubernetes.io/pod and container.seccomp.security.alpha.kubernetes.io/... are deprecated (they will be removed on Kubernetes 1.22). You can directly specify the following fields for Pods and container specs:
        securityContext:
        seccompProfile:
        type: RuntimeDefault|Localhost|Unconfined ## choose one of the three
        localhostProfile: my-profiles/profile-allow.json ## only necessary if type == Localhost
        

      Kubernetes converts annotations and fields automatically, so no additional operations are required.

      • Kubelet Client TLS Certificate Rotation
      • Limit node access to API
        Node authentication mode features are all implemented.
      • Redesign Event API
        To reduce the impact of events on the system performance and add more fields to provide more useful information, Event API is redesigned on Kubernetes 1.19.
      • CertificateSigningRequest API
        In addition to certificates.k8s.io/v1beta1, the certificates.k8s.io/v1 version is added to CertificateSigningRequest. When using certificates.k8s.io/v1:
        • You must specify spec.signerName and stop using kubernetes.io/legacy-unknown.
        • You must specify spec.usages, which can contain only known and unique usages.
        • You must specify status.conditions[*].status.
        • status.certificate must be PEM encoded and can contain only the CERTIFICATE block.
    • Features graduating to beta:
      The following features graduate to beta and are enabled by default:

      • EndpointSliceProxying
        kube-proxy reads information from EndpointSlices instead of Endpoints, which greatly improves the cluster scalability and makes it easier to add new features such as topology-aware routing.
      • KubeSchedulerConfiguration
      • HugePageStorageMediumSize
      • ImmutableEphemeralVolumes
        The Secret and ConfigMap volumes can be marked as immutable. When there are many Secret and ConfigMap volumes, the pressure on apiserver can be greatly mitigated.
      • NodeDisruptionExclusion
      • NonPreemptingPriority
      • ServiceNodeExclusion
      • RootCAConfigMap
      • kube-scheduler metrics
      • ServiceAccountIssuerDiscovery

    Deprecations and removals

    Deprecated versions

    Deprecated Version New Version
    apiextensions.k8s.io/v1beta1 apiextensions.k8s.io/v1
    apiregistration.k8s.io/v1beta1 apiregistration.k8s.io/v1
    authentication.k8s.io/v1beta1 authentication.k8s.io/v1
    authorization.k8s.io/v1beta1 authorization.k8s.io/v1
    autoscaling/v2beta1 autoscaling/v2beta2
    coordination.k8s.io/v1beta1 oordination.k8s.io/v1
    storage.k8s.io/v1beta1 storage.k8s.io/v1

    kube-apiserver

    1. The componentstatus API is deprecated. This API provided status of etcd, kube-scheduler and kube-controller-manager components, but only worked when those components were local to apiserver, and when kube-scheduler and kube-controller-manager exposed unsecured health endpoints.
      After this API is deprecated, etcd health is included in the kube-apiserver health check and kube-scheduler/kube-controller-manager health checks can be made directly against those components' health endpoints.
    2. apiserver no longer listens on insecure ports.
      The --address and --insecure-bind-address parameters can be set, but are invalid. The --port and --insecure-port parameters can be set to only 0. These parameters will be removed on Kubernetes 1.24.
    3. TokenRequest and TokenRequestProjection graduate to GA. You need to set the following parameters for kube-apiserver:
    • --service-account-issuer: Fixed URL of the cluster API server.
    • --service-account-key-file: One or multiple public keys for token verification.
    • --service-account-signing-key-file: Private key for service account issuing, which can use the same file as the --service-account-private-key-file parameter of kube-controller-manager.

    kubelet

    1. The following parameters are removed:
      • -seccomp-profile-root
      • --cloud-provider and --cloud-config, which are replaced with config
      • --really-crash-for-testing and --chaos-chance
    2. The deprecated metrics/resource/v1alpha1 endpoint is removed and replaced with metrics/resource.

    Other removals

    • The failure-domain.beta.kubernetes.io/zone and failure-domain.beta.kubernetes.io/region labels are deprecated and replaced with topology.kubernetes.io/zone and topology.kubernetes.io/region respectively. All users of the failure-domain.beta... labels should switch to the topology... equivalents.
    • PodPreset is removed, and you can use webhooks to implement this feature.
    • The basic auth authentication method is no longer supported.
    • Direct CBS inline mounting to workloads is no longer supported.
      Note:

      When you upgrade from Kubernetes 1.18 to 1.20, successful mounting of CSI ephemeral (inline) volumes cannot be guaranteed. If your application uses a CSI ephemeral volume, we recommend you convert it to a persistent volume before upgrade.

    Change logs

    Kubernetes 1.20 changelog
    Kubernetes 1.19 changelog

    Kubernetes 1.18 Changes Since 1.16

    Major updates

    Graduation of Cloud Provider labels to GA

    Deprecated and new labels are as listed below:

    Deprecated Label New Label
    beta.kubernetes.io/instance-type node.kubernetes.io/instance-type
    failure-domain.beta.kubernetes.io/region topology.kubernetes.io/region
    failure-domain.beta.kubernetes.io/zone topology.kubernetes.io/zone

    Graduation of volume snapshot to beta

    VolumeSnapshotDataSource is enabled by default. For more information, see Kubernetes 1.17 Feature: Kubernetes Volume Snapshot Moves to Beta.

    Graduation of CSI Migration to beta

    CSI Migration is enabled by default. For more information, see Kubernetes 1.17 Feature: Kubernetes In-Tree to CSI Volume Migration Moves to Beta.

    Graduation of Kubernetes Topology Manager to beta

    The Topology Manager feature moves to beta on Kubernetes 1.18. This feature enables NUMA alignment of CPU and devices (such as SR-IOV VFs) that will allow your workload to run in an environment optimized for low latency.
    Prior to the introduction of the Topology Manager, the CPU and Device Manager would make resource allocation decisions independent of each other. This could result in undesirable allocations on multi-socket CPU systems, causing degraded performance on latency critical applications.

    Graduation of Server-Side Apply to beta 2

    Server-Side Apply was promoted to beta on Kubernetes 1.16, but is now introducing a second beta (Server-Side Apply) on Kubernetes 1.18. This new version will track and manage changes to fields of all new Kubernetes objects, allowing you to know what changed your resources and when.

    IngressClass resource

    The IngressClass resource is used to describe a type of Ingress within a Kubernetes cluster. Ingresses can specify the class they are associated with by using a new ingressClassName field on Ingresses. This new resource and field replace the deprecated kubernetes.io/ingress.class annotation.

    Other updates

    • Graduation of NodeLocal DNSCache to GA.
    • Graduation of IPv6 to beta.
    • kubectl debug: Alpha feature.
    • Windows CSI support: Alpha feature.
    • ImmutableEphemeralVolumes: Alpha feature (it supports immutable ConfigMaps and Secrets without refreshing the corresponding volumes).
    • The following features graduate to GA:
      • ScheduleDaemonSetPods
      • TaintNodesByCondition
      • WatchBookmark
      • NodeLease
      • CSINodeInfo
      • VolumeSubpathEnvExpansion
      • AttachVolumeLimit
      • ResourceQuotaScopeSelectors
      • VolumePVCDataSource
      • TaintBasedEvictions
      • BlockVolume and CSIBlockVolume
      • Windows RunAsUserName
    • Features graduating to beta:
      • EndpointSlices: Disabled by default
      • CSIMigrationAWS: Disabled by default
      • StartupProbe
      • EvenPodsSpread

    Deprecations and removals

    Removed features

    The following features, which are enabled by default and cannot be configured, are removed.

    • GCERegionalPersistentDisk
    • EnableAggregatedDiscoveryTimeout
    • PersistentLocalVolumes
    • CustomResourceValidation
    • CustomResourceSubresources
    • CustomResourceWebhookConversion
    • CustomResourcePublishOpenAPI
    • CustomResourceDefaulting

    Other removals

    The following built-in cluster roles are removed:

    • system:csi-external-provisioner
    • system:csi-external-attacher

    Deprecated features and parameters

    • The default service IP CIDR block (10.0.0.0/24) is deprecated. It must be set through the --service-cluster-ip-range parameter on kube-apiserver.
    • The rbac.authorization.k8s.io/v1alpha1 and rbac.authorization.k8s.io/v1beta1 API groups are deprecated and will be removed on Kubernetes 1.20. Therefore, migrate your resources to rbac.authorization.k8s.io/v1.
    • The CSINodeInfo feature gate is deprecated. This feature has graduated to GA and is enabled by default.

    Parameter and other changes

    kube-apiserver

    • --encryption-provider-config: If cacheSize: 0 is specified in the configuration file, versions earlier than 1.18 are automatically configured to cache 1,000 keys, while version 1.18 will report a configuration verification error. You can disable the cache by setting cacheSize to a negative value.
    • --feature-gates: The following features are enabled by default and can no longer be configured through the command line.
      • PodPriority
      • TaintNodesByCondition
      • ResourceQuotaScopeSelectors
      • ScheduleDaemonSetPods
    • The following resource versions (group versions) are no longer supported:
      • apps/v1beta1 and apps/v1beta2, which are replaced with apps/v1.
      • Under extensions/v1beta1:
      • daemonsets, deployments and replicasets, which are replaced with apps/v1.
      • networkpolicies, which is replaced with networking.k8s.io/v1.
      • podsecuritypolicies, which is replaced with policy/v1beta1.

    kubelet

    • --enable-cadvisor-endpoints: This parameter is disabled by default. To access the cAdvisor v1 JSON API, you must enable it.
    • The --redirect-container-streaming parameter is deprecated and will be removed on later versions. Kubernetes 1.18 supports only the default behavior (kubelet proxy for streaming requests). If --redirect-container-streaming=true is set, it must be removed.
    • The /metrics/resource/v1alpha1 endpoint is deprecated and replaced with /metrics/resource.

    kube-proxy

    • The following parameters are deprecated:
      • --healthz-port is deprecated and replaced with --healthz-bind-address.
      • --metrics-port is deprecated and replaced with --metrics-bind-address.
    • The EndpointSliceProxying feature gate (disabled by default) is added to control whether to enable EndpointSlices in kube-proxy. The EndpointSlice feature gate no longer affects the behaviors of kube-proxy.
    • The following timeout settings for IPVS connection configuration are added:
      • --ipvs-tcp-timeout
      • --ipvs-tcpfin-timeout
      • --ipvs-udp-timeout
    • The iptables mode supports the IPv4/IPv6 dual-protocol stack.

    kube-scheduler

    • The scheduling_duration_seconds metric is deprecated.
    • scheduling_algorithm_predicate_evaluation_seconds is deprecated and replaced with framework_extension_point_duration_seconds[extension_point="Filter"].
    • scheduling_algorithm_priority_evaluation_seconds is deprecated and replaced with framework_extension_point_duration_seconds[extension_point="Score"].
    • AlwaysCheckAllPredicates is deprecated in the scheduler policy API.

    -enable-profiling parameter

    To align kube-apiserver, kube-controller-manager and kube-scheduler, profiling is enabled by default. To disable profiling, specify the --enable-profiling=false parameter.

    kubectl

    • The deprecated --include-uninitialized parameter is removed.
    • kubectl and k8s.io/client-go no longer use http://localhost:8080 as the default apiserver address.
    • kubectl run supports Pod creation and no longer supports using the deprecated generator to create other types of resources.
    • The deprecated kubectl rolling-update command is removed and replaced with the rollout command.
    • –dry-run supports three parameter values: client, server, and none.
    • –dry-run=server supports the following commands: apply, patch, create, run, annotate, label, set, autoscale, drain, rollout undo, and expose.
    • The kubectl alpha debug command is added, which can be used for debugging and troubleshooting on ephemeral containers in Pods (the EphemeralContainers feature introduced on version 1.16 needs to be enabled).

    hyperkube

    The implementation of hyperkube is changed from Go code to a bash script.

    Change logs

    Kubernetes 1.18 changelog
    Kubernetes 1.17 changelog

    Kubernetes 1.16 Changes Since 1.14

    Major updates

    Improved cluster stability and availability

    Production-ready features like bare metal cluster tool and high availability (HA) are improved and enhanced.
    kubeadm support for HA capability moves to beta, allowing you to use the kubeadm init and kubeadm join commands to configure and deploy an HA control plane. Certificate management has become more robust, with kubeadm now seamlessly rotating all your certificates (on upgrades) before they expire. For more information, see Ability to create dynamic HA clusters with kubeadm and kubeadm: graduate the kubeadm configuration.

    Continuous CSI improvement

    SIG Storage continues work to enable migration of in-tree volume plugins to Container Storage Interface (CSI). It works on bringing CSI to feature parity with in-tree functionality, including resizing and inline volumes. It introduces new alpha functionality in CSI that doesn't exist in the Kubernetes Storage subsystem yet, like volume cloning.
    Volume cloning enables you to specify another PVC as a DataSource when configuring a new volume. If the underlying storage system supports this functionality and implements the CLONE_VOLUME capability in its CSI driver, then the new volume becomes a clone of the source volume. For more information, see In-tree storage plugin to CSI Driver Migration.

    Features

    • Features graduating to GA:
      • CRD
      • Admission Webhook
      • GCERegionalPersistentDisk
      • CustomResourcePublishOpenAPI
      • CustomResourceSubresources
      • CustomResourceValidation
      • CustomResourceWebhookConversion
    • CSI support for volume resizing graduates to beta.

    General updates

    • Go modules are supported by the Kubernetes core.
    • Preparation on cloud provider extraction and code organization is continued. The cloud provider code has been moved to kubernetes/legacy-cloud-providers for easier removal later and external usage.
    • kubectl get and describe should work well with extensions
    • Support 3rd party device monitoring plugins.
    • A new scheduling framework for developing and managing plugins and extending the scheduler features is in alpha. For more information, see Scheduling Framework.
    • extensions/v1beta1, apps/v1beta1 and apps/v1beta2 APIs continue to be depreciated. These extensions will be retired on Kubernetes 1.16.
    • The Topology Manager component is added to Kubelet. It aims to coordinate resource allocation decisions to optimize resource allocation.
    • IPv4/IPv6 dual stack is supported to assign both IPv4 and IPv6 addresses to Pods and Services.
    • The API server network proxy is in alpha.
    • More extension options are provided for cloud controller manager migration.
    • extensions/v1beta1, apps/v1beta1 and apps/v1beta2 APIs are deprecated.

    Known issues

    Using the --log-file parameter is known to be problematic on Kubernetes 1.15. This presents as things being logged multiple times to the same file. For more information, see [Failing Test] timeouts in ci-kubernetes-e2e-gce-scale-performance.

    Update notes

    • Cluster
      • The following labels can no longer be added to new nodes: beta.kubernetes.io/metadata-proxy-ready, beta.kubernetes.io/metadata-proxy-ready and beta.kubernetes.io/kube-proxy-ds-ready.
        • ip-mask-agent uses node.kubernetes.io/masq-agent-ds-ready as the node selector and no longer uses beta.kubernetes.io/masq-agent-ds-ready.
        • kube-proxy uses node.kubernetes.io/kube-proxy-ds-ready as the node selector and no longer uses beta.kubernetes.io/kube-proxy-ds-ready.
        • metadata-proxy uses cloud.google.com/metadata-proxy-ready as the node selector and no longer uses beta.kubernetes.io/metadata-proxy-ready.
    • API Machinery
      k8s.io/kubernetes and other published components (such as k8s.io/client-go and k8s.io/api) now contain Go module files, including version information of the dependent library. For more information on consuming k8s.io/client-go using Go modules, see Installing client-go and add go module support, manage vendor directory using go mod vendor.
    • Apps

    Hyperkube short aliases have been removed from source code, because hyperkube docker image currently creates these aliases. For more information, see fix Remove hyperkube short aliases.

    • Lifecycle
      • Support for deprecated kubeadm v1alpha3 configuration is totally removed.
      • kube-up.sh no longer supports centos and local providers.
    • Storage
      • The Node.Status.Volumes.Attached.DevicePath field is no longer set for CSI volumes. You must update any external controllers that depend on this field.
      • CSI alpha CRDs are removed.
      • The StorageObjectInUseProtection admission plugin is enabled by default. If you previously had not enabled it, your cluster behavior may change.
      • When PodInfoOnMount is enabled for a CSI driver, the new csi.storage.k8s.io/ephemeral parameter in the volume context allows a driver's NodePublishVolume implementation to determine on a case-by-case basis whether the volume is ephemeral or a normal persistent volume. For more information, see persistent and ephemeral csi volumes.
      • The VolumePVCDataSource (storage volume cloning feature) is promoted to beta. For more information, see Promote VolumePVCDataSource to beta for 1.16.
      • Limits for in-tree and CSI volumes are integrated into one scheduler predicate. For more information, see Volume Scheduling Limits.
    • kube-apiserver
      • The --enable-logs-handler parameter is deprecated and will be removed on Kubernetes 1.19.
      • The --basic-auth-file flag and authentication mode are deprecated and will be removed from a future release.
      • The default service IP CIDR block (10.0.0.0/24) is deprecated and will be removed in six months/two releases. The --service-cluster-ip-range parameter is required to configure the service IP range.
    • kube-scheduler
      The v1beta1 Event API is used. Any tool targeting scheduler events needs to use it.
    • kube-proxy
      • The --conntrack-max parameter is removed and replaced with --conntrack-min and --conntrack-max-per-core.
      • The --cleanup-iptables parameter is removed.
      • --resource-container is removed.
    • kubelet
      • The --allow-privileged, --host-ipc-sources, --host-pid-sources and --host-network-sources parameters are removed and replaced with the admission controller of PodSecurityPolicy.
      • The cAdvisor JSON API is deprecated.
      • --containerized is removed.
      • The --node-labels parameter can no longer be used to configure forbidden labels prefixed with kubernetes.io- or k8s.io-.
    • kubectl
      • kubectl scale job is removed.
      • The --pod/-p parameter of the kubectl exec command is removed.
      • The kubectl convert command is removed.
      • --include-uninitialized is removed.
      • kubectl cp no longer supports copying symbolic links from containers. You can use the following commands instead:
      • local to pod: tar cf - /tmp/foo | kubectl exec -i -n <some-namespace> <some-pod> -- tar xf - -C /tmp/bar
      • pod to local: kubectl exec -n <some-namespace> <some-pod> -- tar cf - /tmp/foo | tar xf - -C /tmp/bar
    • kubeadm
      • The kubeadm upgrade node config and kubeadm upgrade node experimental-control-plane commands are deprecated and replaced with kubeadm upgrade node.
      • The --experimental-control-plane parameter is deprecated and replaced with --control-plane.
      • The --experimental-upload-certs parameter is deprecated and replaced with --upload-certs.
      • The kubeadm config upload command is deprecated and replaced with kubeadm init phase upload-confi.
      • CoreDNS checks readiness via the ready plugin.
      • The proxy plugin is deprecated and replaced with the forward plugin.
      • The resyncperiod option is removed from the kubernetes plugin.
      • The upstream option is deprecated. If it is specified, it will be ignored.

    Change logs

    Kubernetes 1.16 changelog
    Kubernetes 1.15 changelog

    1.14 Changes Since 1.12

    Major updates

    General updates

    • dry-run graduates to beta (dry-run enables you to simulate real API requests without actually changing the cluster status).
    • kubectl diff graduates to beta.
    • kubectl plugin registration becomes stable.
    • kubelet plugin mechanism graduates to beta.
    • CSIPersistentVolume graduates to GA.
    • TaintBasedEviction graduates to beta.
    • kube-scheduler perception of volume topology becomes stable.
    • Support for out-of-tree CSI volume plugins becomes stable.
    • Third-party device monitoring plugins are supported.
    • kube-scheduler subnet feasibility graduates to beta.
    • Pod Ready supports customizing probe conditions.
    • Node memory supports HugePage.
    • RuntimeClass graduates to beta.
    • Node OS/Arch labels graduate to GA.
    • Node leases graduate to beta.
    • The kubelet resource metrics endpoint graduates to alpha and supports data collection through Prometheus.
    • runAsGroup graduates to beta.
    • kubectl apply server-side graduates to alpha, allowing you to perform apply operations on the server side.
    • kubectl supports kustomize.
    • resolv.conf can be configured in Pods.
    • CSI volumes can be resized.
    • CSI supports topology.
    • Volume mounting supports configuration of sub-path parameters.
    • CSI supports raw block devices.
    • CSI supports local ephemeral volumes.

    Update notes

    • kube-apiserver
      • etcd2 is no longer supported. --storage-backend=etcd3 is used by default.
      • The --etcd-quorum-read parameter is deprecated.
      • The --storage-versions parameter is deprecated.
      • The --repair-malformed-updates parameter is deprecated.
    • kube-controller-manager
      The --insecure-experimental-approve-all-kubelet-csrs-for-group parameter is deprecated.
    • kubelet
    • The --google-json-key parameter is deprecated.
    • The --experimental-fail-swap-on parameter is deprecated.
    • kube-scheduler
      componentconfig/v1alpha1 is no longer supported.
    • kubectl
      The run-container command is no longer supported.
    • taints
      node.alpha.kubernetes.io/notReady and node.alpha.kubernetes.io/unreachable are no longer supported and are replaced with node.kubernetes.io/not-ready and node.kubernetes.io/unreachable respectively.

    Change logs

    Kubernetes 1.14 changelog
    Kubernetes 1.13 changelog

    Kubernetes 1.12 Changes Since 1.10

    Major updates

    API

    • Subresources for CustomResources are now beta and enabled by default. With this, updates to the /status subresource will disallow updates to all fields other than .status (not just .spec and .metadata as before). Also, required and description can be used at the root of the CRD OpenAPI validation schema when the /status subresource is enabled. In addition, you can now create multiple versions of CustomResourceDefinitions, but without any kind of automatic conversion, and CustomResourceDefinitions now allow specification of additional columns for kubectl get output via the spec.additionalPrinterColumns field.
    • The dry run feature is supported. It allows you to view the execution results of some commands without having to submit relevant modifications.

    Authentication and authorization

    • RBAC aggregation of ClusterRoles graduates to GA. The client-go credentials plugin graduates to beta, allowing you to get TLS authentication information from external plugins.
    • The following annotations are added to audit events, so that you can be better informed of the audit decision-making process:
      • The Authorization component sets authorization.k8s.io/decision (the allow or forbid authorization decision) and authorization.k8s.io/reason (the reason for this decision).
      • The PodSecurityPolicy admission controller sets podsecuritypolicy.admission.k8s.io/admit-policy and podsecuritypolicy.admission.k8s.io/validate-policy annotations containing the name of the policy that allows a Pod to be admitted. (PodSecurityPolicy also gains the ability to limit hostPath volume mounts to be read-only.)
    • The NodeRestriction admission controller prevents nodes from modifying taints on their node objects, making it easier to keep track of which nodes should be in use.

    CLI

    CLI implements a new plugin mechanism, providing a library with common CLI tooling for plugin authors and further refactorings of the code.

    Network

    • The IPVS mode graduates to GA.
    • CoreDNS graduates to GA to replace kube-dns.

    Node

    • DynamicKubeletConfig graduates to beta.
    • cri-tools graduates to GA.
    • PodShareProcessNamespace graduates to beta.
    • Alpha features RuntimeClass and CustomCFSQuotaPeriod are added.

    Scheduler

    • Pod priority and preemption graduate to beta.
    • DaemonSet Pod scheduling is no longer managed by the DaemonSet controller, but by the default scheduler.
    • TaintNodeByCondition graduates to beta.
    • The Use Local Image First feature is enabled by default. During Pod scheduling, nodes that have locally pulled the images required by all or some Pods will have a higher priority. This accelerates the launch of Pods.

    General updates

    • Features graduating to GA: ClusterRole and StorageObjectInUseProtection.
    • Features graduating to beta: External cloud provider.

    Update notes

    • kube-apiserver
      • The --storage-version parameter is removed and replaced with --storage-versions. The --storage-versions parameter is also deprecated.
      • The default value of --endpoint-reconciler-type is changed to lease.
      • When --enable-admission-plugins is used, it is contained by default. When the --admission-control parameter is used, it must be explicitly specified.
    • kubelet
      • The --rotate-certificates parameter is deprecated and replaced with the .RotateCertificates field in the configuration file.
    • kubectl
      • All kubectl run generators except run-pod/v1 are deprecated.
      • The --interactive parameter is removed from kubectl logs.
      • --use-openapi-print-columns is deprecated and replaced with --server-print.

    Change logs

    Kubernetes 1.12 changelog
    Kubernetes 1.11 changelog

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