mirror of
https://github.com/k3s-io/kubernetes.git
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348 lines
12 KiB
Go
348 lines
12 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 master
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import (
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"fmt"
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"os"
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"path/filepath"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/intstr"
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"k8s.io/apimachinery/pkg/util/wait"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/pkg/api/v1"
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ext "k8s.io/client-go/pkg/apis/extensions/v1beta1"
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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/images"
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"k8s.io/kubernetes/pkg/util/version"
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)
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var (
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// maximum unavailable and surge instances per self-hosted component deployment
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maxUnavailable = intstr.FromInt(0)
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maxSurge = intstr.FromInt(1)
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)
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func CreateSelfHostedControlPlane(cfg *kubeadmapi.MasterConfiguration, client *clientset.Clientset) error {
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volumes := []v1.Volume{k8sVolume()}
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volumeMounts := []v1.VolumeMount{k8sVolumeMount()}
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if isCertsVolumeMountNeeded() {
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volumes = append(volumes, certsVolume(cfg))
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volumeMounts = append(volumeMounts, certsVolumeMount())
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}
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if isPkiVolumeMountNeeded() {
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volumes = append(volumes, pkiVolume())
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volumeMounts = append(volumeMounts, pkiVolumeMount())
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}
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// Need lock for self-hosted
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volumes = append(volumes, flockVolume())
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volumeMounts = append(volumeMounts, flockVolumeMount())
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if err := launchSelfHostedAPIServer(cfg, client, volumes, volumeMounts); err != nil {
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return err
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}
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if err := launchSelfHostedScheduler(cfg, client, volumes, volumeMounts); err != nil {
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return err
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}
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if err := launchSelfHostedControllerManager(cfg, client, volumes, volumeMounts); err != nil {
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return err
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}
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return nil
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}
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func launchSelfHostedAPIServer(cfg *kubeadmapi.MasterConfiguration, client *clientset.Clientset, volumes []v1.Volume, volumeMounts []v1.VolumeMount) error {
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start := time.Now()
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kubeVersion, err := version.ParseSemantic(cfg.KubernetesVersion)
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if err != nil {
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return err
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}
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apiServer := getAPIServerDS(cfg, volumes, volumeMounts, kubeVersion)
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if _, err := client.Extensions().DaemonSets(metav1.NamespaceSystem).Create(&apiServer); err != nil {
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return fmt.Errorf("failed to create self-hosted %q daemon set [%v]", kubeAPIServer, err)
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}
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wait.PollInfinite(kubeadmconstants.APICallRetryInterval, func() (bool, error) {
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// TODO: This might be pointless, checking the pods is probably enough.
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// It does however get us a count of how many there should be which may be useful
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// with HA.
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apiDS, err := client.DaemonSets(metav1.NamespaceSystem).Get("self-hosted-"+kubeAPIServer,
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metav1.GetOptions{})
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if err != nil {
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fmt.Println("[self-hosted] error getting apiserver DaemonSet:", err)
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return false, nil
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}
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fmt.Printf("[self-hosted] %s DaemonSet current=%d, desired=%d\n",
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kubeAPIServer,
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apiDS.Status.CurrentNumberScheduled,
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apiDS.Status.DesiredNumberScheduled)
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if apiDS.Status.CurrentNumberScheduled != apiDS.Status.DesiredNumberScheduled {
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return false, nil
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}
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return true, nil
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})
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// Wait for self-hosted API server to take ownership
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waitForPodsWithLabel(client, "self-hosted-"+kubeAPIServer, true)
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// Remove temporary API server
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apiServerStaticManifestPath := buildStaticManifestFilepath(kubeAPIServer)
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if err := os.RemoveAll(apiServerStaticManifestPath); err != nil {
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return fmt.Errorf("unable to delete temporary API server manifest [%v]", err)
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}
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WaitForAPI(client)
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fmt.Printf("[self-hosted] self-hosted kube-apiserver ready after %f seconds\n", time.Since(start).Seconds())
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return nil
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}
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func launchSelfHostedControllerManager(cfg *kubeadmapi.MasterConfiguration, client *clientset.Clientset, volumes []v1.Volume, volumeMounts []v1.VolumeMount) error {
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start := time.Now()
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kubeVersion, err := version.ParseSemantic(cfg.KubernetesVersion)
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if err != nil {
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return err
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}
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ctrlMgr := getControllerManagerDeployment(cfg, volumes, volumeMounts, kubeVersion)
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if _, err := client.Extensions().Deployments(metav1.NamespaceSystem).Create(&ctrlMgr); err != nil {
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return fmt.Errorf("failed to create self-hosted %q deployment [%v]", kubeControllerManager, err)
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}
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waitForPodsWithLabel(client, "self-hosted-"+kubeControllerManager, true)
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ctrlMgrStaticManifestPath := buildStaticManifestFilepath(kubeControllerManager)
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if err := os.RemoveAll(ctrlMgrStaticManifestPath); err != nil {
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return fmt.Errorf("unable to delete temporary controller manager manifest [%v]", err)
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}
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fmt.Printf("[self-hosted] self-hosted kube-controller-manager ready after %f seconds\n", time.Since(start).Seconds())
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return nil
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}
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func launchSelfHostedScheduler(cfg *kubeadmapi.MasterConfiguration, client *clientset.Clientset, volumes []v1.Volume, volumeMounts []v1.VolumeMount) error {
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start := time.Now()
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scheduler := getSchedulerDeployment(cfg, volumes, volumeMounts)
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if _, err := client.Extensions().Deployments(metav1.NamespaceSystem).Create(&scheduler); err != nil {
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return fmt.Errorf("failed to create self-hosted %q deployment [%v]", kubeScheduler, err)
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}
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waitForPodsWithLabel(client, "self-hosted-"+kubeScheduler, true)
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schedulerStaticManifestPath := buildStaticManifestFilepath(kubeScheduler)
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if err := os.RemoveAll(schedulerStaticManifestPath); err != nil {
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return fmt.Errorf("unable to delete temporary scheduler manifest [%v]", err)
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}
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fmt.Printf("[self-hosted] self-hosted kube-scheduler ready after %f seconds\n", time.Since(start).Seconds())
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return nil
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}
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// waitForPodsWithLabel will lookup pods with the given label and wait until they are all
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// reporting status as running.
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func waitForPodsWithLabel(client *clientset.Clientset, appLabel string, mustBeRunning bool) {
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wait.PollInfinite(kubeadmconstants.APICallRetryInterval, func() (bool, error) {
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// TODO: Do we need a stronger label link than this?
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listOpts := metav1.ListOptions{LabelSelector: fmt.Sprintf("k8s-app=%s", appLabel)}
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apiPods, err := client.Pods(metav1.NamespaceSystem).List(listOpts)
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if err != nil {
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fmt.Printf("[self-hosted] error getting %s pods [%v]\n", appLabel, err)
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return false, nil
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}
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fmt.Printf("[self-hosted] Found %d %s pods\n", len(apiPods.Items), appLabel)
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// TODO: HA
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if int32(len(apiPods.Items)) != 1 {
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return false, nil
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}
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for _, pod := range apiPods.Items {
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fmt.Printf("[self-hosted] Pod %s status: %s\n", pod.Name, pod.Status.Phase)
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if mustBeRunning && pod.Status.Phase != "Running" {
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return false, nil
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}
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}
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return true, nil
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})
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}
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// Sources from bootkube templates.go
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func getAPIServerDS(cfg *kubeadmapi.MasterConfiguration, volumes []v1.Volume, volumeMounts []v1.VolumeMount, kubeVersion *version.Version) ext.DaemonSet {
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ds := ext.DaemonSet{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "extensions/v1beta1",
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Kind: "DaemonSet",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: "self-hosted-" + kubeAPIServer,
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Namespace: "kube-system",
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Labels: map[string]string{"k8s-app": "self-hosted-" + kubeAPIServer},
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},
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Spec: ext.DaemonSetSpec{
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: map[string]string{
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"k8s-app": "self-hosted-" + kubeAPIServer,
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"component": kubeAPIServer,
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"tier": "control-plane",
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},
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},
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Spec: v1.PodSpec{
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NodeSelector: map[string]string{kubeadmconstants.LabelNodeRoleMaster: ""},
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HostNetwork: true,
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Volumes: volumes,
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Containers: []v1.Container{
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{
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Name: "self-hosted-" + kubeAPIServer,
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Image: images.GetCoreImage(images.KubeAPIServerImage, cfg, kubeadmapi.GlobalEnvParams.HyperkubeImage),
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Command: getAPIServerCommand(cfg, true, kubeVersion),
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Env: getSelfHostedAPIServerEnv(),
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VolumeMounts: volumeMounts,
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LivenessProbe: componentProbe(6443, "/healthz", v1.URISchemeHTTPS),
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Resources: componentResources("250m"),
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},
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},
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Tolerations: []v1.Toleration{kubeadmconstants.MasterToleration},
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DNSPolicy: v1.DNSClusterFirstWithHostNet,
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},
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},
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},
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}
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return ds
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}
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func getControllerManagerDeployment(cfg *kubeadmapi.MasterConfiguration, volumes []v1.Volume, volumeMounts []v1.VolumeMount, kubeVersion *version.Version) ext.Deployment {
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d := ext.Deployment{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "extensions/v1beta1",
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Kind: "Deployment",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: "self-hosted-" + kubeControllerManager,
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Namespace: "kube-system",
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Labels: map[string]string{"k8s-app": "self-hosted-" + kubeControllerManager},
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},
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Spec: ext.DeploymentSpec{
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// TODO bootkube uses 2 replicas
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Strategy: ext.DeploymentStrategy{
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Type: ext.RollingUpdateDeploymentStrategyType,
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RollingUpdate: &ext.RollingUpdateDeployment{
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MaxUnavailable: &maxUnavailable,
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MaxSurge: &maxSurge,
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},
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},
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: map[string]string{
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"k8s-app": "self-hosted-" + kubeControllerManager,
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"component": kubeControllerManager,
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"tier": "control-plane",
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},
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},
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Spec: v1.PodSpec{
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NodeSelector: map[string]string{kubeadmconstants.LabelNodeRoleMaster: ""},
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HostNetwork: true,
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Volumes: volumes,
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Containers: []v1.Container{
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{
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Name: "self-hosted-" + kubeControllerManager,
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Image: images.GetCoreImage(images.KubeControllerManagerImage, cfg, kubeadmapi.GlobalEnvParams.HyperkubeImage),
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Command: getControllerManagerCommand(cfg, true, kubeVersion),
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VolumeMounts: volumeMounts,
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LivenessProbe: componentProbe(10252, "/healthz", v1.URISchemeHTTP),
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Resources: componentResources("200m"),
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Env: getProxyEnvVars(),
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},
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},
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Tolerations: []v1.Toleration{kubeadmconstants.MasterToleration},
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DNSPolicy: v1.DNSClusterFirstWithHostNet,
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},
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},
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},
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}
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return d
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}
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func getSchedulerDeployment(cfg *kubeadmapi.MasterConfiguration, volumes []v1.Volume, volumeMounts []v1.VolumeMount) ext.Deployment {
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d := ext.Deployment{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "extensions/v1beta1",
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Kind: "Deployment",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: "self-hosted-" + kubeScheduler,
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Namespace: "kube-system",
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Labels: map[string]string{"k8s-app": "self-hosted-" + kubeScheduler},
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},
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Spec: ext.DeploymentSpec{
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// TODO bootkube uses 2 replicas
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Strategy: ext.DeploymentStrategy{
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Type: ext.RollingUpdateDeploymentStrategyType,
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RollingUpdate: &ext.RollingUpdateDeployment{
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MaxUnavailable: &maxUnavailable,
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MaxSurge: &maxSurge,
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},
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},
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Template: v1.PodTemplateSpec{
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ObjectMeta: metav1.ObjectMeta{
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Labels: map[string]string{
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"k8s-app": "self-hosted-" + kubeScheduler,
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"component": kubeScheduler,
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"tier": "control-plane",
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},
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},
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Spec: v1.PodSpec{
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NodeSelector: map[string]string{kubeadmconstants.LabelNodeRoleMaster: ""},
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HostNetwork: true,
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Volumes: volumes,
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Containers: []v1.Container{
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{
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Name: "self-hosted-" + kubeScheduler,
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Image: images.GetCoreImage(images.KubeSchedulerImage, cfg, kubeadmapi.GlobalEnvParams.HyperkubeImage),
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Command: getSchedulerCommand(cfg, true),
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VolumeMounts: volumeMounts,
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LivenessProbe: componentProbe(10251, "/healthz", v1.URISchemeHTTP),
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Resources: componentResources("100m"),
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Env: getProxyEnvVars(),
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},
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},
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Tolerations: []v1.Toleration{kubeadmconstants.MasterToleration},
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DNSPolicy: v1.DNSClusterFirstWithHostNet,
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},
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},
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},
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}
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return d
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}
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func buildStaticManifestFilepath(name string) string {
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return filepath.Join(kubeadmapi.GlobalEnvParams.KubernetesDir, kubeadmconstants.ManifestsSubDirName, name+".yaml")
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}
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