mirror of
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119 lines
4.1 KiB
Go
119 lines
4.1 KiB
Go
/*
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Copyright 2019 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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"os"
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"strings"
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"github.com/coredns/corefile-migration/migration"
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"github.com/pkg/errors"
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"k8s.io/apimachinery/pkg/util/sets"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/klog/v2"
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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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"k8s.io/kubernetes/cmd/kubeadm/app/preflight"
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)
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// CoreDNSCheck validates installed kubelet version
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type CoreDNSCheck struct {
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name string
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client clientset.Interface
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f func(clientset.Interface) error
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}
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// Name is part of the preflight.Checker interface
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func (c CoreDNSCheck) Name() string {
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return c.name
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}
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// Check is part of the preflight.Checker interface
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func (c CoreDNSCheck) Check() (warnings, errors []error) {
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if err := c.f(c.client); err != nil {
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return nil, []error{err}
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}
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return nil, nil
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}
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// RunCoreDNSMigrationCheck initializes checks related to CoreDNS migration.
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func RunCoreDNSMigrationCheck(client clientset.Interface, ignorePreflightErrors sets.Set[string]) error {
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migrationChecks := []preflight.Checker{
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&CoreDNSCheck{
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name: "CoreDNSUnsupportedPlugins",
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client: client,
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f: checkUnsupportedPlugins,
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},
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&CoreDNSCheck{
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name: "CoreDNSMigration",
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client: client,
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f: checkMigration,
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},
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}
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return preflight.RunChecks(migrationChecks, os.Stderr, ignorePreflightErrors)
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}
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// checkUnsupportedPlugins checks if there are any plugins included in the current configuration
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// that are unsupported for migration.
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func checkUnsupportedPlugins(client clientset.Interface) error {
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klog.V(1).Infoln("validating if there are any unsupported CoreDNS plugins in the Corefile")
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_, corefile, currentInstalledCoreDNSversion, err := dns.GetCoreDNSInfo(client)
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if err != nil {
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return err
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}
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currentInstalledCoreDNSversion = strings.TrimLeft(currentInstalledCoreDNSversion, "v")
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targetCoreDNSVersion := strings.TrimLeft(kubeadmconstants.CoreDNSVersion, "v")
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if currentInstalledCoreDNSversion == targetCoreDNSVersion {
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return nil
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}
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unsupportedCoreDNS, err := migration.Unsupported(currentInstalledCoreDNSversion, targetCoreDNSVersion, corefile)
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if err != nil {
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return err
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}
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if len(unsupportedCoreDNS) != 0 {
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var UnsupportedPlugins []string
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for _, unsup := range unsupportedCoreDNS {
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UnsupportedPlugins = append(UnsupportedPlugins, unsup.ToString())
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}
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fmt.Println("[preflight] The corefile contains plugins that kubeadm/CoreDNS does not know how to migrate. " +
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"Each plugin listed should be manually verified for compatibility with the newer version of CoreDNS. " +
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"Once ready, the upgrade can be initiated by skipping the preflight check. During the upgrade, " +
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"kubeadm will migrate the configuration while leaving the listed plugin configs untouched, " +
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"but cannot guarantee that they will work with the newer version of CoreDNS.")
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return errors.Errorf("CoreDNS cannot migrate the following plugins:\n%s", UnsupportedPlugins)
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}
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return nil
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}
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// checkMigration validates if migration of the current CoreDNS ConfigMap is possible.
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func checkMigration(client clientset.Interface) error {
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klog.V(1).Infoln("validating if migration can be done for the current CoreDNS release.")
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_, corefile, currentInstalledCoreDNSversion, err := dns.GetCoreDNSInfo(client)
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if err != nil {
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return err
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}
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currentInstalledCoreDNSversion = strings.TrimLeft(currentInstalledCoreDNSversion, "v")
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_, err = migration.Migrate(currentInstalledCoreDNSversion, strings.TrimLeft(kubeadmconstants.CoreDNSVersion, "v"), corefile, false)
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return errors.Wrap(err, "CoreDNS will not be upgraded")
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}
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