Merge pull request #68449 from fabriziopandini/kubeadm-annotate-cri

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions here: https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md.

kubeadm: add mandatory phase "annotate-cri"

**What this PR does / why we need it**:
In v1.12, after the changing how kubeadm-config upload/fetch, AnnotateCRISocket is now a necessary step for getting a cluster that can be upgraded using phases. This PR adds a new subcommand for letting users to invoke AnnotateCRISocket as a phase

**Which issue(s) this PR fixes**:
Fixes # https://github.com/kubernetes/kubeadm/issues/925

**Special notes for your reviewer**:
When testing this PR, I found that one of the tests on component config defaulting was broken (didn't have time to investigate why yet). This PR fixes this test as well  

**Release note**:
```release-note
kubeadm: added phase command "alpha phase kubelet config annotate-cri"
```
@kubernetes/sig-cluster-lifecycle-pr-reviews
/sig cluster-lifecycle
/area kubeadm
/assign @timothysc @neolit123 
/kind bug

cmd/kubeadm/app/cmd/phases/BUILD

@@ -38,6 +38,7 @@ go_library(
         "//cmd/kubeadm/app/phases/kubeconfig:go_default_library",
         "//cmd/kubeadm/app/phases/kubelet:go_default_library",
         "//cmd/kubeadm/app/phases/markmaster:go_default_library",
+        "//cmd/kubeadm/app/phases/patchnode:go_default_library",
         "//cmd/kubeadm/app/phases/selfhosting:go_default_library",
         "//cmd/kubeadm/app/phases/upgrade:go_default_library",
         "//cmd/kubeadm/app/phases/uploadconfig:go_default_library",

cmd/kubeadm/app/cmd/phases/kubelet.go

@@ -27,6 +27,7 @@ import (
 	cmdutil "k8s.io/kubernetes/cmd/kubeadm/app/cmd/util"
 	"k8s.io/kubernetes/cmd/kubeadm/app/constants"
 	kubeletphase "k8s.io/kubernetes/cmd/kubeadm/app/phases/kubelet"
+	patchnodephase "k8s.io/kubernetes/cmd/kubeadm/app/phases/patchnode"
 	"k8s.io/kubernetes/cmd/kubeadm/app/preflight"
 	kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
 	configutil "k8s.io/kubernetes/cmd/kubeadm/app/util/config"
@@ -61,6 +62,14 @@ var (
 		kubeadm alpha phase kubelet config upload --config kubeadm.yaml
 		`)
 
+	kubeletConfigAnnotateCRILongDesc = normalizer.LongDesc(`
+		Adds an annotation to the current node with the CRI socket specified in the kubeadm InitConfiguration object.
+		` + cmdutil.AlphaDisclaimer)
+
+	kubeletConfigAnnotateCRIExample = normalizer.Examples(`
+		kubeadm alpha phase kubelet config annotate-cri --config kubeadm.yaml
+		`)
+
 	kubeletConfigDownloadLongDesc = normalizer.LongDesc(`
 		Downloads the kubelet configuration from a ConfigMap of the form "kubelet-config-1.X" in the cluster,
 		where X is the minor version of the kubelet. Either kubeadm autodetects the kubelet version by exec-ing
@@ -177,6 +186,7 @@ func NewCmdKubeletConfig() *cobra.Command {
 	}
 
 	cmd.AddCommand(NewCmdKubeletConfigUpload())
+	cmd.AddCommand(NewCmdKubeletAnnotateCRI())
 	cmd.AddCommand(NewCmdKubeletConfigDownload())
 	cmd.AddCommand(NewCmdKubeletConfigWriteToDisk())
 	cmd.AddCommand(NewCmdKubeletConfigEnableDynamic())
@@ -222,6 +232,45 @@ func NewCmdKubeletConfigUpload() *cobra.Command {
 	return cmd
 }
 
+// NewCmdKubeletAnnotateCRI calls cobra.Command for annotating the node with the given crisocket
+func NewCmdKubeletAnnotateCRI() *cobra.Command {
+	cfg := &kubeadmapiv1alpha3.InitConfiguration{}
+	var cfgPath string
+	kubeConfigFile := constants.GetAdminKubeConfigPath()
+
+	cmd := &cobra.Command{
+		Use:     "annotate-cri",
+		Short:   "annotates the node with the given crisocket",
+		Long:    kubeletConfigAnnotateCRILongDesc,
+		Example: kubeletConfigAnnotateCRIExample,
+		Run: func(cmd *cobra.Command, args []string) {
+			if len(cfgPath) == 0 {
+				kubeadmutil.CheckErr(fmt.Errorf("The --config argument is required"))
+			}
+
+			// KubernetesVersion is not used, but we set it explicitly to avoid the lookup
+			// of the version from the internet when executing ConfigFileAndDefaultsToInternalConfig
+			err := SetKubernetesVersion(nil, cfg)
+			kubeadmutil.CheckErr(err)
+
+			// This call returns the ready-to-use configuration based on the configuration file
+			internalcfg, err := configutil.ConfigFileAndDefaultsToInternalConfig(cfgPath, cfg)
+			kubeadmutil.CheckErr(err)
+
+			kubeConfigFile = cmdutil.FindExistingKubeConfig(kubeConfigFile)
+			client, err := kubeconfigutil.ClientSetFromFile(kubeConfigFile)
+			kubeadmutil.CheckErr(err)
+
+			err = patchnodephase.AnnotateCRISocket(client, internalcfg.NodeRegistration.Name, internalcfg.NodeRegistration.CRISocket)
+			kubeadmutil.CheckErr(err)
+		},
+	}
+
+	options.AddKubeConfigFlag(cmd.Flags(), &kubeConfigFile)
+	options.AddConfigFlag(cmd.Flags(), &cfgPath)
+	return cmd
+}
+
 // NewCmdKubeletConfigDownload calls cobra.Command for downloading the kubelet configuration from the kubelet-config-1.X ConfigMap in the cluster
 func NewCmdKubeletConfigDownload() *cobra.Command {
 	var kubeletVersionStr string

docs/.generated_docs

@@ -47,6 +47,7 @@ docs/admin/kubeadm_alpha_phase_kubeconfig_scheduler.md
 docs/admin/kubeadm_alpha_phase_kubeconfig_user.md
 docs/admin/kubeadm_alpha_phase_kubelet.md
 docs/admin/kubeadm_alpha_phase_kubelet_config.md
+docs/admin/kubeadm_alpha_phase_kubelet_config_annotate-cri.md
 docs/admin/kubeadm_alpha_phase_kubelet_config_download.md
 docs/admin/kubeadm_alpha_phase_kubelet_config_enable-dynamic.md
 docs/admin/kubeadm_alpha_phase_kubelet_config_upload.md
@@ -130,6 +131,7 @@ docs/man/man1/kubeadm-alpha-phase-kubeconfig-kubelet.1
 docs/man/man1/kubeadm-alpha-phase-kubeconfig-scheduler.1
 docs/man/man1/kubeadm-alpha-phase-kubeconfig-user.1
 docs/man/man1/kubeadm-alpha-phase-kubeconfig.1
+docs/man/man1/kubeadm-alpha-phase-kubelet-config-annotate-cri.1
 docs/man/man1/kubeadm-alpha-phase-kubelet-config-download.1
 docs/man/man1/kubeadm-alpha-phase-kubelet-config-enable-dynamic.1
 docs/man/man1/kubeadm-alpha-phase-kubelet-config-upload.1

docs/admin/kubeadm_alpha_phase_kubelet_config_annotate-cri.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/man/man1/kubeadm-alpha-phase-kubelet-config-annotate-cri.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.