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| --- | ||
| title: Kubernetesバージョンとバージョンスキューサポートポリシー | ||
| content_template: templates/concept | ||
| weight: 70 | ||
| --- | ||
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| {{% capture overview %}} | ||
| This document describes the maximum version skew supported between various Kubernetes components. | ||
| Specific cluster deployment tools may place additional restrictions on version skew. | ||
| {{% /capture %}} | ||
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| {{% capture body %}} | ||
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| ## サポートされるバージョン | ||
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| Kubernetes versions are expressed as **x.y.z**, | ||
| where **x** is the major version, **y** is the minor version, and **z** is the patch version, following [Semantic Versioning](http://semver.org/) terminology. | ||
| For more information, see [Kubernetes Release Versioning](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/release/versioning.md#kubernetes-release-versioning). | ||
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| The Kubernetes project maintains release branches for the most recent three minor releases. | ||
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| Applicable fixes, including security fixes, may be backported to those three release branches, depending on severity and feasibility. | ||
| Patch releases are cut from those branches at a regular cadence, or as needed. | ||
| This decision is owned by the [patch release manager](https://github.com/kubernetes/sig-release/blob/master/release-team/role-handbooks/patch-release-manager/README.md#release-timing). | ||
| The patch release manager is a member of the [release team for each release](https://github.com/kubernetes/sig-release/tree/master/releases/). | ||
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| Minor releases occur approximately every 3 months, so each minor release branch is maintained for approximately 9 months. | ||
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| ## サポートされるバージョンスキュー | ||
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| ### kube-apiserver | ||
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| In [highly-availabile (HA) clusters](https://kubernetes.io/docs/setup/independent/high-availability/), the newest and oldest `kube-apiserver` instances must be within one minor version. | ||
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| Example: | ||
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| * newest `kube-apiserver` is at **1.13** | ||
| * other `kube-apiserver` instances are supported at **1.13** and **1.12** | ||
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| ### kubelet | ||
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| `kubelet` must not be newer than `kube-apiserver`, and may be up to two minor versions older. | ||
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| Example: | ||
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| * `kube-apiserver` is at **1.13** | ||
| * `kubelet` is supported at **1.13**, **1.12**, and **1.11** | ||
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| {{< note >}} | ||
| If version skew exists between `kube-apiserver` instances in an HA cluster, this narrows the allowed `kubelet` versions. | ||
| {{</ note >}} | ||
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| Example: | ||
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| * `kube-apiserver` instances are at **1.13** and **1.12** | ||
| * `kubelet` is supported at **1.12**, and **1.11** (**1.13** is not supported because that would be newer than the `kube-apiserver` instance at version **1.12**) | ||
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| ### kube-controller-manager、kube-scheduler、およびcloud-controller-manager | ||
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| `kube-controller-manager`, `kube-scheduler`, and `cloud-controller-manager` must not be newer than the `kube-apiserver` instances they communicate with. They are expected to match the `kube-apiserver` minor version, but may be up to one minor version older (to allow live upgrades). | ||
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| Example: | ||
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| * `kube-apiserver` is at **1.13** | ||
| * `kube-controller-manager`, `kube-scheduler`, and `cloud-controller-manager` are supported at **1.13** and **1.12** | ||
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| {{< note >}} | ||
| If version skew exists between `kube-apiserver` instances in an HA cluster, and these components can communicate with any `kube-apiserver` instance in the cluster (for example, via a load balancer), this narrows the allowed versions of these components. | ||
| {{< /note >}} | ||
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| Example: | ||
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| * `kube-apiserver` instances are at **1.13** and **1.12** | ||
| * `kube-controller-manager`, `kube-scheduler`, and `cloud-controller-manager` communicate with a load balancer that can route to any `kube-apiserver` instance | ||
| * `kube-controller-manager`, `kube-scheduler`, and `cloud-controller-manager` are supported at **1.12** (**1.13** is not supported because that would be newer than the `kube-apiserver` instance at version **1.12**) | ||
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| ### kubectl | ||
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| `kubectl` is supported within one minor version (older or newer) of `kube-apiserver`. | ||
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| Example: | ||
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| * `kube-apiserver` is at **1.13** | ||
| * `kubectl` is supported at **1.14**, **1.13**, and **1.12** | ||
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| {{< note >}} | ||
| If version skew exists between `kube-apiserver` instances in an HA cluster, this narrows the supported `kubectl` versions. | ||
| {{< /note >}} | ||
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| Example: | ||
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| * `kube-apiserver` instances are at **1.13** and **1.12** | ||
| * `kubectl` is supported at **1.13** and **1.12** (other versions would be more than one minor version skewed from one of the `kube-apiserver` components) | ||
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| ## サポートされるコンポーネントのアップグレード順序 | ||
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| The supported version skew between components has implications on the order in which components must be upgraded. | ||
| This section describes the order in which components must be upgraded to transition an existing cluster from version **1.n** to version **1.(n+1)**. | ||
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| ### kube-apiserver | ||
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| Pre-requisites: | ||
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| * In a single-instance cluster, the existing `kube-apiserver` instance is **1.n** | ||
| * In an HA cluster, all `kube-apiserver` instances are at **1.n** or **1.(n+1)** (this ensures maximum skew of 1 minor version between the oldest and newest `kube-apiserver` instance) | ||
| * The `kube-controller-manager`, `kube-scheduler`, and `cloud-controller-manager` instances that communicate with this server are at version **1.n** (this ensures they are not newer than the existing API server version, and are within 1 minor version of the new API server version) | ||
| * `kubelet` instances on all nodes are at version **1.n** or **1.(n-1)** (this ensures they are not newer than the existing API server version, and are within 2 minor versions of the new API server version) | ||
| * Registered admission webhooks are able to handle the data the new `kube-apiserver` instance will send them: | ||
| * `ValidatingWebhookConfiguration` and `MutatingWebhookConfiguration` objects are updated to include any new versions of REST resources added in **1.(n+1)** | ||
| * The webhooks are able to handle any new versions of REST resources that will be sent to them, and any new fields added to existing versions in **1.(n+1)** | ||
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| Upgrade `kube-apiserver` to **1.(n+1)** | ||
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| {{< note >}} | ||
| Project policies for [API deprecation](https://kubernetes.io/docs/reference/using-api/deprecation-policy/) and | ||
| [API change guidelines](https://github.com/kubernetes/community/blob/master/contributors/devel/api_changes.md) | ||
| require `kube-apiserver` to not skip minor versions when upgrading, even in single-instance clusters. | ||
| {{< /note >}} | ||
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| ### kube-controller-manager、kube-scheduler、およびcloud-controller-manager | ||
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| Pre-requisites: | ||
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| * The `kube-apiserver` instances these components communicate with are at **1.(n+1)** (in HA clusters in which these control plane components can communicate with any `kube-apiserver` instance in the cluster, all `kube-apiserver` instances must be upgraded before upgrading these components) | ||
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| Upgrade `kube-controller-manager`, `kube-scheduler`, and `cloud-controller-manager` to **1.(n+1)** | ||
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| ### kubelet | ||
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| Pre-requisites: | ||
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| * The `kube-apiserver` instances the `kubelet` communicates with are at **1.(n+1)** | ||
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| Optionally upgrade `kubelet` instances to **1.(n+1)** (or they can be left at **1.n** or **1.(n-1)**) | ||
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| {{< warning >}} | ||
| Running a cluster with `kubelet` instances that are persistently two minor versions behind `kube-apiserver` is not recommended: | ||
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| * they must be upgraded within one minor version of `kube-apiserver` before the control plane can be upgraded | ||
| * it increases the likelihood of running `kubelet` versions older than the three maintained minor releases | ||
| {{</ warning >}} |