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Merge pull request #94506 from neolit123/1.20-coredns-remove-supported-version-check

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kubeadm: remove the CoreDNS check for supported image digests
This commit is contained in:
Kubernetes Prow Robot 2020-09-04 07:37:41 -07:00 committed by GitHub
commit 3cdfdfccc9
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2 changed files with 3 additions and 64 deletions
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1
cmd/kubeadm/app/phases/addons/dns/BUILD
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@ -46,7 +46,6 @@ go_library(
"//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
"//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
"//staging/src/k8s.io/client-go/kubernetes:go_default_library",
"//staging/src/k8s.io/client-go/kubernetes/scheme:go_default_library",
"//vendor/github.com/caddyserver/caddy/caddyfile:go_default_library",

66
cmd/kubeadm/app/phases/addons/dns/dns.go
View File

@ -21,9 +21,7 @@ import (
"encoding/json"
"fmt"
"net"
"regexp"
"strings"
"time"
"github.com/caddyserver/caddy/caddyfile"
"github.com/coredns/corefile-migration/migration"
@ -35,7 +33,6 @@ import (
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
kuberuntime "k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/wait"
clientset "k8s.io/client-go/kubernetes"
clientsetscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/klog/v2"
@ -270,22 +267,15 @@ func createCoreDNSAddon(deploymentBytes, serviceBytes, configBytes []byte, clien
return errors.Wrap(err, "unable to fetch CoreDNS current installed version and ConfigMap.")
}
canMigrateCorefile, err := isCoreDNSVersionSupported(client)
if err != nil {
return err
}
corefileMigrationRequired, err := isCoreDNSConfigMapMigrationRequired(corefile, currentInstalledCoreDNSVersion)
if err != nil {
return err
}
if !canMigrateCorefile {
klog.Warningf("the CoreDNS Configuration will not be migrated due to unsupported version of CoreDNS. " +
"The existing CoreDNS Corefile configuration and deployment has been retained.")
}
// Assume that migration is always possible, rely on migrateCoreDNSCorefile() to fail if not.
canMigrateCorefile := true
if corefileMigrationRequired && canMigrateCorefile {
if corefileMigrationRequired {
if err := migrateCoreDNSCorefile(client, coreDNSConfigMap, corefile, currentInstalledCoreDNSVersion); err != nil {
// Errors in Corefile Migration is verified during preflight checks. This part will be executed when a user has chosen
// to ignore preflight check errors.
@ -394,56 +384,6 @@ func isCoreDNSConfigMapMigrationRequired(corefile, currentInstalledCoreDNSVersio
return isMigrationRequired, nil
}
var (
// imageDigestMatcher is used to match the SHA256 digest from the ImageID of the CoreDNS pods
imageDigestMatcher = regexp.MustCompile(`^.*(?i:sha256:([[:alnum:]]{64}))$`)
)
func isCoreDNSVersionSupported(client clientset.Interface) (bool, error) {
var lastError error
var pods []v1.Pod
pollTimeout := 10 * time.Second
err := wait.PollImmediate(kubeadmconstants.APICallRetryInterval, pollTimeout, func() (bool, error) {
coreDNSPodList, err := client.CoreV1().Pods(metav1.NamespaceSystem).List(
context.TODO(),
metav1.ListOptions{
LabelSelector: "k8s-app=kube-dns",
},
)
if err != nil {
lastError = err
return false, nil
}
for _, pod := range coreDNSPodList.Items {
if pod.Status.Phase != v1.PodRunning {
lastError = errors.New("found non-running CoreDNS pods")
return false, nil
}
}
pods = coreDNSPodList.Items
return true, nil
})
if err != nil {
return false, errors.Wrapf(lastError, "could not list the running CoreDNS pods after %v", pollTimeout)
}
for _, pod := range pods {
imageID := imageDigestMatcher.FindStringSubmatch(pod.Status.ContainerStatuses[0].ImageID)
if len(imageID) != 2 {
return false, errors.Errorf("pod %s unable to match SHA256 digest ID in %q", pod.GetName(), pod.Status.ContainerStatuses[0].ImageID)
}
// The actual digest should be at imageID[1]
if !migration.Released(imageID[1]) {
return false, errors.Errorf("unknown digest %q for pod %s", imageID[1], pod.GetName())
}
}
return true, nil
}
func migrateCoreDNSCorefile(client clientset.Interface, cm *v1.ConfigMap, corefile, currentInstalledCoreDNSVersion string) error {
// Since the current configuration present is not the default version, try and migrate it.
updatedCorefile, err := migration.Migrate(currentInstalledCoreDNSVersion, kubeadmconstants.CoreDNSVersion, corefile, false)