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Merge pull request #89593 from neolit123/1.19-skip-kube-proxy-on-upgrade

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kubeadm: skip kube-proxy/dns upgrades on missing ConfigMaps
This commit is contained in:
Kubernetes Prow Robot 2020-04-15 11:36:00 -07:00 committed by GitHub
commit 7f1d09f439
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1 changed files with 59 additions and 8 deletions
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67
cmd/kubeadm/app/phases/upgrade/postupgrade.go
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@ -28,6 +28,7 @@ import (
errorsutil "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/version"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/klog"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
"k8s.io/kubernetes/cmd/kubeadm/app/phases/addons/dns"
@ -100,18 +101,68 @@ func PerformPostUpgradeTasks(client clientset.Interface, cfg *kubeadmapi.InitCon
errs = append(errs, err)
}
// Upgrade kube-dns/CoreDNS and kube-proxy
if err := dns.EnsureDNSAddon(&cfg.ClusterConfiguration, client); err != nil {
errs = append(errs, err)
// If the coredns / kube-dns ConfigMaps are missing, show a warning and assume that the
// DNS addon was skipped during "kubeadm init", and that its redeployment on upgrade is not desired.
//
// TODO: remove this once "kubeadm upgrade apply" phases are supported:
// https://github.com/kubernetes/kubeadm/issues/1318
var missingCoreDNSConfigMap, missingKubeDNSConfigMap bool
if _, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(
context.TODO(),
kubeadmconstants.CoreDNSConfigMap,
metav1.GetOptions{},
); err != nil && apierrors.IsNotFound(err) {
missingCoreDNSConfigMap = true
}
// Remove the old DNS deployment if a new DNS service is now used (kube-dns to CoreDNS or vice versa)
if err := removeOldDNSDeploymentIfAnotherDNSIsUsed(&cfg.ClusterConfiguration, client, dryRun); err != nil {
errs = append(errs, err)
if _, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(
context.TODO(),
kubeadmconstants.KubeDNSConfigMap,
metav1.GetOptions{},
); err != nil && apierrors.IsNotFound(err) {
missingKubeDNSConfigMap = true
}
if missingCoreDNSConfigMap && missingKubeDNSConfigMap {
klog.Warningf("the ConfigMaps %q/%q in the namespace %q were not found. "+
"Assuming that a DNS server was not deployed for this cluster. "+
"Note that once 'kubeadm upgrade apply' supports phases you "+
"will have to skip the DNS upgrade manually",
kubeadmconstants.CoreDNSConfigMap,
kubeadmconstants.KubeDNSConfigMap,
metav1.NamespaceSystem)
} else {
// Upgrade CoreDNS/kube-dns
if err := dns.EnsureDNSAddon(&cfg.ClusterConfiguration, client); err != nil {
errs = append(errs, err)
}
// Remove the old DNS deployment if a new DNS service is now used (kube-dns to CoreDNS or vice versa)
if err := removeOldDNSDeploymentIfAnotherDNSIsUsed(&cfg.ClusterConfiguration, client, dryRun); err != nil {
errs = append(errs, err)
}
}
if err := proxy.EnsureProxyAddon(&cfg.ClusterConfiguration, &cfg.LocalAPIEndpoint, client); err != nil {
errs = append(errs, err)
// If the kube-proxy ConfigMap is missing, show a warning and assume that kube-proxy
// was skipped during "kubeadm init", and that its redeployment on upgrade is not desired.
//
// TODO: remove this once "kubeadm upgrade apply" phases are supported:
// https://github.com/kubernetes/kubeadm/issues/1318
if _, err := client.CoreV1().ConfigMaps(metav1.NamespaceSystem).Get(
context.TODO(),
kubeadmconstants.KubeProxyConfigMap,
metav1.GetOptions{},
); err != nil && apierrors.IsNotFound(err) {
klog.Warningf("the ConfigMap %q in the namespace %q was not found. "+
"Assuming that kube-proxy was not deployed for this cluster. "+
"Note that once 'kubeadm upgrade apply' supports phases you "+
"will have to skip the kube-proxy upgrade manually",
kubeadmconstants.KubeProxyConfigMap,
metav1.NamespaceSystem)
} else {
// Upgrade kube-proxy
if err := proxy.EnsureProxyAddon(&cfg.ClusterConfiguration, &cfg.LocalAPIEndpoint, client); err != nil {
errs = append(errs, err)
}
}
return errorsutil.NewAggregate(errs)
}