mirror of
https://github.com/k3s-io/kubernetes.git
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319 lines
13 KiB
Go
319 lines
13 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package upgrade
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import (
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"fmt"
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"strings"
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versionutil "k8s.io/apimachinery/pkg/util/version"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/klog/v2"
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kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
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kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
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"k8s.io/kubernetes/cmd/kubeadm/app/phases/addons/dns"
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)
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// Upgrade defines an upgrade possibility to upgrade from a current version to a new one
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type Upgrade struct {
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Description string
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Before ClusterState
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After ClusterState
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}
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// CanUpgradeKubelets returns whether an upgrade of any kubelet in the cluster is possible
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func (u *Upgrade) CanUpgradeKubelets() bool {
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// If there are multiple different versions now, an upgrade is possible (even if only for a subset of the nodes)
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if len(u.Before.KubeletVersions) > 1 {
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return true
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}
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// Don't report something available for upgrade if we don't know the current state
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if len(u.Before.KubeletVersions) == 0 {
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return false
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}
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// if the same version number existed both before and after, we don't have to upgrade it
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_, sameVersionFound := u.Before.KubeletVersions[u.After.KubeVersion]
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return !sameVersionFound
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}
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// CanUpgradeEtcd returns whether an upgrade of etcd is possible
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func (u *Upgrade) CanUpgradeEtcd() bool {
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return u.Before.EtcdVersion != u.After.EtcdVersion
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}
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// ClusterState describes the state of certain versions for a cluster
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type ClusterState struct {
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// KubeVersion describes the version of the Kubernetes API Server, Controller Manager, Scheduler and Proxy.
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KubeVersion string
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// DNSType describes the type of DNS add-on used in the cluster.
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DNSType kubeadmapi.DNSAddOnType
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// DNSVersion describes the version of the DNS add-on.
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DNSVersion string
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// KubeadmVersion describes the version of the kubeadm CLI
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KubeadmVersion string
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// KubeletVersions is a map with a version number linked to the amount of kubelets running that version in the cluster
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KubeletVersions map[string]uint16
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// EtcdVersion represents the version of etcd used in the cluster
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EtcdVersion string
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}
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// GetAvailableUpgrades fetches all versions from the specified VersionGetter and computes which
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// kinds of upgrades can be performed
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func GetAvailableUpgrades(versionGetterImpl VersionGetter, experimentalUpgradesAllowed, rcUpgradesAllowed, externalEtcd bool, dnsType kubeadmapi.DNSAddOnType, client clientset.Interface, manifestsDir string) ([]Upgrade, error) {
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fmt.Println("[upgrade] Fetching available versions to upgrade to")
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// Collect the upgrades kubeadm can do in this list
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upgrades := []Upgrade{}
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// Get the cluster version
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clusterVersionStr, clusterVersion, err := versionGetterImpl.ClusterVersion()
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if err != nil {
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return upgrades, err
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}
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fmt.Printf("[upgrade/versions] Cluster version: %s\n", clusterVersionStr)
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// Get current kubeadm CLI version
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kubeadmVersionStr, kubeadmVersion, err := versionGetterImpl.KubeadmVersion()
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if err != nil {
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return upgrades, err
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}
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fmt.Printf("[upgrade/versions] kubeadm version: %s\n", kubeadmVersionStr)
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// Get and output the current latest stable version
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stableVersionStr, stableVersion, err := versionGetterImpl.VersionFromCILabel("stable", "stable version")
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if err != nil {
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fmt.Printf("[upgrade/versions] WARNING: %v\n", err)
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fmt.Println("[upgrade/versions] WARNING: Falling back to current kubeadm version as latest stable version")
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stableVersionStr, stableVersion = kubeadmVersionStr, kubeadmVersion
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} else {
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fmt.Printf("[upgrade/versions] Latest %s: %s\n", "stable version", stableVersionStr)
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}
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// Get the kubelet versions in the cluster
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kubeletVersions, err := versionGetterImpl.KubeletVersions()
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if err != nil {
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return upgrades, err
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}
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// Get current stacked etcd version on the local node
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var etcdVersion string
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if !externalEtcd {
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etcdVersion, err = GetEtcdImageTagFromStaticPod(manifestsDir)
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if err != nil {
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return upgrades, err
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}
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}
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currentDNSType, dnsVersion, err := dns.DeployedDNSAddon(client)
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if err != nil {
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return nil, err
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}
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// Construct a descriptor for the current state of the world
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beforeState := ClusterState{
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KubeVersion: clusterVersionStr,
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DNSType: currentDNSType,
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DNSVersion: dnsVersion,
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KubeadmVersion: kubeadmVersionStr,
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KubeletVersions: kubeletVersions,
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EtcdVersion: etcdVersion,
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}
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// Do a "dumb guess" that a new minor upgrade is available just because the latest stable version is higher than the cluster version
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// This guess will be corrected once we know if there is a patch version available
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canDoMinorUpgrade := clusterVersion.LessThan(stableVersion)
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// A patch version doesn't exist if the cluster version is higher than or equal to the current stable version
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// in the case that a user is trying to upgrade from, let's say, v1.8.0-beta.2 to v1.8.0-rc.1 (given we support such upgrades experimentally)
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// a stable-1.8 branch doesn't exist yet. Hence this check.
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if patchVersionBranchExists(clusterVersion, stableVersion) {
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currentBranch := getBranchFromVersion(clusterVersionStr)
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versionLabel := fmt.Sprintf("stable-%s", currentBranch)
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description := fmt.Sprintf("version in the v%s series", currentBranch)
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// Get and output the latest patch version for the cluster branch
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patchVersionStr, patchVersion, err := versionGetterImpl.VersionFromCILabel(versionLabel, description)
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if err != nil {
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fmt.Printf("[upgrade/versions] WARNING: %v\n", err)
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} else {
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fmt.Printf("[upgrade/versions] Latest %s: %s\n", description, patchVersionStr)
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// Check if a minor version upgrade is possible when a patch release exists
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// It's only possible if the latest patch version is higher than the current patch version
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// If that's the case, they must be on different branches => a newer minor version can be upgraded to
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canDoMinorUpgrade = minorUpgradePossibleWithPatchRelease(stableVersion, patchVersion)
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// If the cluster version is lower than the newest patch version, we should inform about the possible upgrade
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if patchUpgradePossible(clusterVersion, patchVersion) {
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// The kubeadm version has to be upgraded to the latest patch version
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newKubeadmVer := patchVersionStr
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if kubeadmVersion.AtLeast(patchVersion) {
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// In this case, the kubeadm CLI version is new enough. Don't display an update suggestion for kubeadm by making .NewKubeadmVersion equal .CurrentKubeadmVersion
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newKubeadmVer = kubeadmVersionStr
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}
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upgrades = append(upgrades, Upgrade{
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Description: description,
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Before: beforeState,
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After: ClusterState{
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KubeVersion: patchVersionStr,
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DNSType: dnsType,
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DNSVersion: kubeadmconstants.GetDNSVersion(dnsType),
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KubeadmVersion: newKubeadmVer,
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EtcdVersion: getSuggestedEtcdVersion(externalEtcd, patchVersionStr),
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// KubeletVersions is unset here as it is not used anywhere in .After
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},
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})
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}
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}
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}
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if canDoMinorUpgrade {
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upgrades = append(upgrades, Upgrade{
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Description: "stable version",
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Before: beforeState,
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After: ClusterState{
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KubeVersion: stableVersionStr,
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DNSType: dnsType,
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DNSVersion: kubeadmconstants.GetDNSVersion(dnsType),
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KubeadmVersion: stableVersionStr,
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EtcdVersion: getSuggestedEtcdVersion(externalEtcd, stableVersionStr),
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// KubeletVersions is unset here as it is not used anywhere in .After
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},
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})
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}
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if experimentalUpgradesAllowed || rcUpgradesAllowed {
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// dl.k8s.io/release/latest.txt is ALWAYS an alpha.X version
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// dl.k8s.io/release/latest-1.X.txt is first v1.X.0-alpha.0 -> v1.X.0-alpha.Y, then v1.X.0-beta.0 to v1.X.0-beta.Z, then v1.X.0-rc.1 to v1.X.0-rc.W.
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// After the v1.X.0 release, latest-1.X.txt is always a beta.0 version. Let's say the latest stable version on the v1.7 branch is v1.7.3, then the
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// latest-1.7 version is v1.7.4-beta.0
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// Worth noticing is that when the release-1.X branch is cut; there are two versions tagged: v1.X.0-beta.0 AND v1.(X+1).alpha.0
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// The v1.(X+1).alpha.0 is pretty much useless and should just be ignored, as more betas may be released that have more features than the initial v1.(X+1).alpha.0
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// So what we do below is getting the latest overall version, always an v1.X.0-alpha.Y version. Then we get latest-1.(X-1) version. This version may be anything
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// between v1.(X-1).0-beta.0 and v1.(X-1).Z-beta.0. At some point in time, latest-1.(X-1) will point to v1.(X-1).0-rc.1. Then we should show it.
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// The flow looks like this (with time on the X axis):
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// v1.8.0-alpha.1 -> v1.8.0-alpha.2 -> v1.8.0-alpha.3 | release-1.8 branch | v1.8.0-beta.0 -> v1.8.0-beta.1 -> v1.8.0-beta.2 -> v1.8.0-rc.1 -> v1.8.0 -> v1.8.1
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// v1.9.0-alpha.0 -> v1.9.0-alpha.1 -> v1.9.0-alpha.2
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// Get and output the current latest unstable version
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latestVersionStr, latestVersion, err := versionGetterImpl.VersionFromCILabel("latest", "experimental version")
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if err != nil {
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return upgrades, err
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}
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fmt.Printf("[upgrade/versions] Latest %s: %s\n", "experimental version", latestVersionStr)
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minorUnstable := latestVersion.Components()[1]
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// Get and output the current latest unstable version
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previousBranch := fmt.Sprintf("latest-1.%d", minorUnstable-1)
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previousBranchLatestVersionStr, previousBranchLatestVersion, err := versionGetterImpl.VersionFromCILabel(previousBranch, "")
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if err != nil {
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return upgrades, err
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}
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fmt.Printf("[upgrade/versions] Latest %s: %s\n", "", previousBranchLatestVersionStr)
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// If that previous latest version is an RC, RCs are allowed and the cluster version is lower than the RC version, show the upgrade
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if rcUpgradesAllowed && rcUpgradePossible(clusterVersion, previousBranchLatestVersion) {
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upgrades = append(upgrades, Upgrade{
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Description: "release candidate version",
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Before: beforeState,
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After: ClusterState{
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KubeVersion: previousBranchLatestVersionStr,
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DNSType: dnsType,
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DNSVersion: kubeadmconstants.GetDNSVersion(dnsType),
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KubeadmVersion: previousBranchLatestVersionStr,
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EtcdVersion: getSuggestedEtcdVersion(externalEtcd, previousBranchLatestVersionStr),
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// KubeletVersions is unset here as it is not used anywhere in .After
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},
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})
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}
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// Show the possibility if experimental upgrades are allowed
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if experimentalUpgradesAllowed && clusterVersion.LessThan(latestVersion) {
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// Default to assume that the experimental version to show is the unstable one
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unstableKubeVersion := latestVersionStr
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unstableKubeDNSVersion := kubeadmconstants.GetDNSVersion(dnsType)
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// Ẃe should not display alpha.0. The previous branch's beta/rc versions are more relevant due how the kube branching process works.
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if latestVersion.PreRelease() == "alpha.0" {
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unstableKubeVersion = previousBranchLatestVersionStr
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unstableKubeDNSVersion = kubeadmconstants.GetDNSVersion(dnsType)
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}
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upgrades = append(upgrades, Upgrade{
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Description: "experimental version",
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Before: beforeState,
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After: ClusterState{
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KubeVersion: unstableKubeVersion,
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DNSType: dnsType,
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DNSVersion: unstableKubeDNSVersion,
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KubeadmVersion: unstableKubeVersion,
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EtcdVersion: getSuggestedEtcdVersion(externalEtcd, unstableKubeVersion),
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// KubeletVersions is unset here as it is not used anywhere in .After
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},
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})
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}
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}
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// Add a newline in the end of this output to leave some space to the next output section
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fmt.Println("")
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return upgrades, nil
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}
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func getBranchFromVersion(version string) string {
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v := versionutil.MustParseGeneric(version)
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return fmt.Sprintf("%d.%d", v.Major(), v.Minor())
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}
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func patchVersionBranchExists(clusterVersion, stableVersion *versionutil.Version) bool {
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return stableVersion.AtLeast(clusterVersion)
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}
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func patchUpgradePossible(clusterVersion, patchVersion *versionutil.Version) bool {
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return clusterVersion.LessThan(patchVersion)
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}
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func rcUpgradePossible(clusterVersion, previousBranchLatestVersion *versionutil.Version) bool {
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return strings.HasPrefix(previousBranchLatestVersion.PreRelease(), "rc") && clusterVersion.LessThan(previousBranchLatestVersion)
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}
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func minorUpgradePossibleWithPatchRelease(stableVersion, patchVersion *versionutil.Version) bool {
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return patchVersion.LessThan(stableVersion)
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}
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func getSuggestedEtcdVersion(externalEtcd bool, kubernetesVersion string) string {
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if externalEtcd {
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return ""
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}
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etcdVersion, warning, err := kubeadmconstants.EtcdSupportedVersion(kubeadmconstants.SupportedEtcdVersion, kubernetesVersion)
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if err != nil {
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klog.Warningf("[upgrade/versions] could not retrieve an etcd version for the target Kubernetes version: %v", err)
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return "N/A"
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}
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if warning != nil {
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klog.Warningf("[upgrade/versions] %v", warning)
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}
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return etcdVersion.String()
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}
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