mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-10-01 01:36:09 -04:00
bootstrapper: refactor coredns and cilium setup (#2129)
* Decouple CoreDNS installation from Cilium * Align cilium helm installation with other charts * Remove unused functions --------- Signed-off-by: Daniel Weiße <dw@edgeless.systems>
This commit is contained in:
Daniel Weiße
GitHub
parent
39cea48741
commit
7152633255
@ -4,7 +4,6 @@ load("//bazel/go:go_test.bzl", "go_test")
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go_library(
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name = "kubernetes",
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srcs = [
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"ciliuminstallation.go",
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"cloud_provider.go",
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"k8sutil.go",
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"kubernetes.go",
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@ -1,81 +0,0 @@
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/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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// Package kubernetes provides functionality to bootstrap a Kubernetes cluster, or join an exiting one.
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package kubernetes
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import (
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"context"
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"errors"
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"fmt"
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"os/exec"
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"github.com/edgelesssys/constellation/v2/bootstrapper/internal/kubernetes/k8sapi"
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"github.com/edgelesssys/constellation/v2/internal/constants"
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"github.com/edgelesssys/constellation/v2/internal/deploy/helm"
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corev1 "k8s.io/api/core/v1"
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)
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// installCilium sets up the cilium pod network.
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func installCilium(ctx context.Context, helmInstaller helmClient, kubectl k8sapi.Client, release helm.Release, in k8sapi.SetupPodNetworkInput) error {
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timeoutS := int64(10)
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// allow coredns to run on uninitialized nodes (required by cloud-controller-manager)
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tolerations := []corev1.Toleration{
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{
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Key: "node.cloudprovider.kubernetes.io/uninitialized",
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Value: "true",
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Effect: corev1.TaintEffectNoSchedule,
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},
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{
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Key: "node.kubernetes.io/unreachable",
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Operator: corev1.TolerationOpExists,
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Effect: corev1.TaintEffectNoExecute,
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TolerationSeconds: &timeoutS,
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},
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}
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if err := kubectl.AddTolerationsToDeployment(ctx, tolerations, "coredns", "kube-system"); err != nil {
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return fmt.Errorf("failed to add tolerations to coredns deployment: %w", err)
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}
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if err := kubectl.EnforceCoreDNSSpread(ctx); err != nil {
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return fmt.Errorf("failed to enforce CoreDNS spread: %w", err)
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}
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switch in.CloudProvider {
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case "aws", "azure", "openstack", "qemu":
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return installCiliumGeneric(ctx, helmInstaller, release, in.LoadBalancerHost, in.LoadBalancerPort)
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case "gcp":
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return installCiliumGCP(ctx, helmInstaller, release, in.NodeName, in.FirstNodePodCIDR, in.SubnetworkPodCIDR, in.LoadBalancerHost, in.LoadBalancerPort)
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default:
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return fmt.Errorf("unsupported cloud provider %q", in.CloudProvider)
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}
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}
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// installCiliumGeneric installs cilium with the given load balancer endpoint.
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// This is used for cloud providers that do not require special server-side configuration.
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// Currently this is AWS, Azure, and QEMU.
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func installCiliumGeneric(ctx context.Context, helmInstaller helmClient, release helm.Release, kubeAPIHost, kubeAPIPort string) error {
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if release.Values != nil {
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release.Values["k8sServiceHost"] = kubeAPIHost
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release.Values["k8sServicePort"] = kubeAPIPort
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}
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return helmInstaller.InstallChart(ctx, release)
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}
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func installCiliumGCP(ctx context.Context, helmInstaller helmClient, release helm.Release, nodeName, nodePodCIDR, subnetworkPodCIDR, kubeAPIHost, kubeAPIPort string) error {
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out, err := exec.CommandContext(ctx, constants.KubectlPath, "--kubeconfig", constants.ControlPlaneAdminConfFilename, "patch", "node", nodeName, "-p", "{\"spec\":{\"podCIDR\": \""+nodePodCIDR+"\"}}").CombinedOutput()
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if err != nil {
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err = errors.New(string(out))
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return err
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}
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// configure pod network CIDR
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release.Values["ipv4NativeRoutingCIDR"] = subnetworkPodCIDR
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release.Values["strictModeCIDR"] = subnetworkPodCIDR
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release.Values["k8sServiceHost"] = kubeAPIHost
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release.Values["k8sServicePort"] = kubeAPIPort
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return helmInstaller.InstallChart(ctx, release)
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}
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@ -50,7 +50,6 @@ const (
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type Client interface {
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Initialize(kubeconfig []byte) error
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CreateConfigMap(ctx context.Context, configMap corev1.ConfigMap) error
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AddTolerationsToDeployment(ctx context.Context, tolerations []corev1.Toleration, name string, namespace string) error
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AddNodeSelectorsToDeployment(ctx context.Context, selectors map[string]string, name string, namespace string) error
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ListAllNamespaces(ctx context.Context) (*corev1.NamespaceList, error)
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AnnotateNode(ctx context.Context, nodeName, annotationKey, annotationValue string) error
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@ -14,6 +14,7 @@ import (
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"errors"
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"fmt"
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"net"
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"os/exec"
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"regexp"
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"strings"
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"time"
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@ -162,6 +163,10 @@ func (k *KubeWrapper) InitCluster(
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return nil, fmt.Errorf("waiting for Kubernetes API to be available: %w", err)
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}
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if err := k.client.EnforceCoreDNSSpread(ctx); err != nil {
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return nil, fmt.Errorf("configuring CoreDNS deployment: %w", err)
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}
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// Setup the K8s components ConfigMap.
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k8sComponentsConfigMap, err := k.setupK8sComponentsConfigMap(ctx, kubernetesComponents, versionString)
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if err != nil {
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@ -192,8 +197,12 @@ func (k *KubeWrapper) InitCluster(
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}
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log.Infof("Installing Cilium")
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if err = installCilium(ctx, k.helmClient, k.client, helmReleases.Cilium, setupPodNetworkInput); err != nil {
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return nil, fmt.Errorf("installing pod network: %w", err)
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ciliumVals, err := k.setupCiliumVals(ctx, setupPodNetworkInput)
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if err != nil {
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return nil, fmt.Errorf("setting up cilium vals: %w", err)
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}
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if err := k.helmClient.InstallChartWithValues(ctx, helmReleases.Cilium, ciliumVals); err != nil {
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return nil, fmt.Errorf("installing cilium pod network: %w", err)
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}
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log.Infof("Waiting for Cilium to become healthy")
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@ -552,6 +561,31 @@ func (k *KubeWrapper) setupOperatorVals(ctx context.Context) (map[string]any, er
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}, nil
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}
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func (k *KubeWrapper) setupCiliumVals(ctx context.Context, in k8sapi.SetupPodNetworkInput) (map[string]any, error) {
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vals := map[string]any{
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"k8sServiceHost": in.LoadBalancerHost,
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"k8sServicePort": in.LoadBalancerPort,
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}
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// GCP requires extra configuration for Cilium
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if cloudprovider.FromString(k.cloudProvider) == cloudprovider.GCP {
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if out, err := exec.CommandContext(
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ctx, constants.KubectlPath,
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"--kubeconfig", constants.ControlPlaneAdminConfFilename,
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"patch", "node", in.NodeName, "-p", "{\"spec\":{\"podCIDR\": \""+in.FirstNodePodCIDR+"\"}}",
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).CombinedOutput(); err != nil {
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err = errors.New(string(out))
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return nil, fmt.Errorf("%s: %w", out, err)
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}
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vals["ipv4NativeRoutingCIDR"] = in.SubnetworkPodCIDR
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vals["strictModeCIDR"] = in.SubnetworkPodCIDR
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}
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return vals, nil
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}
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type ccmConfigGetter interface {
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GetCCMConfig(ctx context.Context, providerID, cloudServiceAccountURI string) ([]byte, error)
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}
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@ -516,7 +516,6 @@ func (s *stubConfigProvider) JoinConfiguration(_ bool) k8sapi.KubeadmJoinYAML {
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type stubKubectl struct {
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createConfigMapErr error
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addTolerationsToDeploymentErr error
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addTNodeSelectorsToDeploymentErr error
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waitForCRDsErr error
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listAllNamespacesErr error
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@ -534,10 +533,6 @@ func (s *stubKubectl) CreateConfigMap(_ context.Context, _ corev1.ConfigMap) err
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return s.createConfigMapErr
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}
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func (s *stubKubectl) AddTolerationsToDeployment(_ context.Context, _ []corev1.Toleration, _, _ string) error {
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return s.addTolerationsToDeploymentErr
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}
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func (s *stubKubectl) AddNodeSelectorsToDeployment(_ context.Context, _ map[string]string, _, _ string) error {
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return s.addTNodeSelectorsToDeploymentErr
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}
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@ -563,10 +558,6 @@ type stubHelmClient struct {
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installChartError error
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}
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func (s *stubHelmClient) InstallCilium(_ context.Context, _ k8sapi.Client, _ helm.Release, _ k8sapi.SetupPodNetworkInput) error {
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return s.ciliumError
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}
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func (s *stubHelmClient) InstallChart(ctx context.Context, release helm.Release) error {
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return s.InstallChartWithValues(ctx, release, release.Values)
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}
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@ -144,39 +144,34 @@ func (k *Kubectl) GetNodes(ctx context.Context) ([]corev1.Node, error) {
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return nodes.Items, nil
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}
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// AddTolerationsToDeployment adds [K8s tolerations] to the deployment, identified
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// by name and namespace.
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//
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// [K8s tolerations]: https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/
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func (k *Kubectl) AddTolerationsToDeployment(ctx context.Context, tolerations []corev1.Toleration, name string, namespace string) error {
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deployments := k.AppsV1().Deployments(namespace)
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// EnforceCoreDNSSpread adds a pod anti-affinity to the CoreDNS deployment to ensure that
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// CoreDNS pods are spread across nodes.
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func (k *Kubectl) EnforceCoreDNSSpread(ctx context.Context) error {
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// allow CoreDNS Pods to run on uninitialized nodes, which is required by cloud-controller-manager
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tolerationSeconds := int64(10)
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tolerations := []corev1.Toleration{
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{
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Key: "node.cloudprovider.kubernetes.io/uninitialized",
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Value: "true",
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Effect: corev1.TaintEffectNoSchedule,
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},
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{
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Key: "node.kubernetes.io/unreachable",
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Operator: corev1.TolerationOpExists,
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Effect: corev1.TaintEffectNoExecute,
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TolerationSeconds: &tolerationSeconds,
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},
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}
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deployments := k.AppsV1().Deployments("kube-system")
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// retry resource update if an error occurs
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err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
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result, err := deployments.Get(ctx, name, metav1.GetOptions{})
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return retry.RetryOnConflict(retry.DefaultRetry, func() error {
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result, err := deployments.Get(ctx, "coredns", metav1.GetOptions{})
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if err != nil {
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return fmt.Errorf("failed to get Deployment to add toleration: %w", err)
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}
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result.Spec.Template.Spec.Tolerations = append(result.Spec.Template.Spec.Tolerations, tolerations...)
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if _, err = deployments.Update(ctx, result, metav1.UpdateOptions{}); 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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return err
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}
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// EnforceCoreDNSSpread adds a pod anti-affinity to the coredns deployment to ensure that
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// coredns pods are spread across nodes.
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func (k *Kubectl) EnforceCoreDNSSpread(ctx context.Context) error {
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deployments := k.AppsV1().Deployments("kube-system")
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// retry resource update if an error occurs
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err := retry.RetryOnConflict(retry.DefaultRetry, func() error {
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result, err := deployments.Get(ctx, "coredns", metav1.GetOptions{})
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if err != nil {
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return fmt.Errorf("failed to get Deployment to add toleration: %w", err)
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}
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if result.Spec.Template.Spec.Affinity == nil {
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result.Spec.Template.Spec.Affinity = &corev1.Affinity{}
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@ -206,10 +201,6 @@ func (k *Kubectl) EnforceCoreDNSSpread(ctx context.Context) error {
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_, err = deployments.Update(ctx, result, metav1.UpdateOptions{})
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return err
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})
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if 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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// AddNodeSelectorsToDeployment adds [K8s selectors] to the deployment, identified
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