mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-10-01 01:36:09 -04:00
536 lines
18 KiB
Go
536 lines
18 KiB
Go
/*
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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
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import (
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"context"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/edgelesssys/constellation/v2/bootstrapper/internal/kubernetes/k8sapi"
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kubewaiter "github.com/edgelesssys/constellation/v2/bootstrapper/internal/kubernetes/kubeWaiter"
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"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
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"github.com/edgelesssys/constellation/v2/internal/cloud/azureshared"
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"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
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"github.com/edgelesssys/constellation/v2/internal/cloud/gcpshared"
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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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"github.com/edgelesssys/constellation/v2/internal/logger"
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"github.com/edgelesssys/constellation/v2/internal/role"
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"github.com/edgelesssys/constellation/v2/internal/versions/components"
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"github.com/spf13/afero"
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"go.uber.org/zap"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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kubeadm "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"
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)
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var validHostnameRegex = regexp.MustCompile(`^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$`)
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// configReader provides kubeconfig as []byte.
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type configReader interface {
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ReadKubeconfig() ([]byte, error)
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}
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// configurationProvider provides kubeadm init and join configuration.
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type configurationProvider interface {
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InitConfiguration(externalCloudProvider bool, k8sVersion string) k8sapi.KubeadmInitYAML
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JoinConfiguration(externalCloudProvider bool) k8sapi.KubeadmJoinYAML
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}
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type kubeAPIWaiter interface {
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Wait(ctx context.Context, kubernetesClient kubewaiter.KubernetesClient) error
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}
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// KubeWrapper implements Cluster interface.
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type KubeWrapper struct {
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cloudProvider string
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clusterUtil clusterUtil
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helmClient helmClient
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kubeAPIWaiter kubeAPIWaiter
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configProvider configurationProvider
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client k8sapi.Client
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kubeconfigReader configReader
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providerMetadata ProviderMetadata
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initialMeasurements measurements.M
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getIPAddr func() (string, error)
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}
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// New creates a new KubeWrapper with real values.
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func New(cloudProvider string, clusterUtil clusterUtil, configProvider configurationProvider, client k8sapi.Client,
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providerMetadata ProviderMetadata, measurements measurements.M, helmClient helmClient, kubeAPIWaiter kubeAPIWaiter,
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) *KubeWrapper {
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return &KubeWrapper{
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cloudProvider: cloudProvider,
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clusterUtil: clusterUtil,
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helmClient: helmClient,
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kubeAPIWaiter: kubeAPIWaiter,
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configProvider: configProvider,
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client: client,
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kubeconfigReader: &KubeconfigReader{fs: afero.Afero{Fs: afero.NewOsFs()}},
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providerMetadata: providerMetadata,
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initialMeasurements: measurements,
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getIPAddr: getIPAddr,
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}
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}
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// InitCluster initializes a new Kubernetes cluster and applies pod network provider.
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func (k *KubeWrapper) InitCluster(
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ctx context.Context, cloudServiceAccountURI, versionString string, measurementSalt []byte, enforcedPCRs []uint32,
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enforceIDKeyDigest bool, azureCVM bool,
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helmReleasesRaw []byte, conformanceMode bool, kubernetesComponents components.Components, log *logger.Logger,
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) ([]byte, error) {
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log.With(zap.String("version", versionString)).Infof("Installing Kubernetes components")
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if err := k.clusterUtil.InstallComponents(ctx, kubernetesComponents); err != nil {
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return nil, err
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}
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var nodePodCIDR string
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var validIPs []net.IP
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// Step 1: retrieve cloud metadata for Kubernetes configuration
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log.Infof("Retrieving node metadata")
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instance, err := k.providerMetadata.Self(ctx)
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if err != nil {
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return nil, fmt.Errorf("retrieving own instance metadata: %w", err)
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}
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if instance.VPCIP != "" {
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validIPs = append(validIPs, net.ParseIP(instance.VPCIP))
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}
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nodeName, err := k8sCompliantHostname(instance.Name)
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if err != nil {
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return nil, fmt.Errorf("generating node name: %w", err)
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}
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nodeIP := instance.VPCIP
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subnetworkPodCIDR := instance.SecondaryIPRange
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if len(instance.AliasIPRanges) > 0 {
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nodePodCIDR = instance.AliasIPRanges[0]
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}
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// this is the endpoint in "kubeadm init --control-plane-endpoint=<IP/DNS>:<port>"
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controlPlaneEndpoint, err := k.providerMetadata.GetLoadBalancerEndpoint(ctx)
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if err != nil {
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return nil, fmt.Errorf("retrieving load balancer endpoint: %w", err)
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}
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log.With(
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zap.String("nodeName", nodeName),
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zap.String("providerID", instance.ProviderID),
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zap.String("nodeIP", nodeIP),
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zap.String("controlPlaneEndpoint", controlPlaneEndpoint),
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zap.String("podCIDR", subnetworkPodCIDR),
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).Infof("Setting information for node")
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// Step 2: configure kubeadm init config
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ccmSupported := cloudprovider.FromString(k.cloudProvider) == cloudprovider.Azure ||
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cloudprovider.FromString(k.cloudProvider) == cloudprovider.GCP
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initConfig := k.configProvider.InitConfiguration(ccmSupported, versionString)
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initConfig.SetNodeIP(nodeIP)
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initConfig.SetCertSANs([]string{nodeIP})
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initConfig.SetNodeName(nodeName)
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initConfig.SetProviderID(instance.ProviderID)
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initConfig.SetControlPlaneEndpoint(controlPlaneEndpoint)
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initConfigYAML, err := initConfig.Marshal()
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if err != nil {
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return nil, fmt.Errorf("encoding kubeadm init configuration as YAML: %w", err)
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}
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log.Infof("Initializing Kubernetes cluster")
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if err := k.clusterUtil.InitCluster(ctx, initConfigYAML, nodeName, validIPs, controlPlaneEndpoint, conformanceMode, log); err != nil {
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return nil, fmt.Errorf("kubeadm init: %w", err)
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}
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kubeConfig, err := k.GetKubeconfig()
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if err != nil {
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return nil, fmt.Errorf("reading kubeconfig after cluster initialization: %w", err)
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}
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err = k.client.Initialize(kubeConfig)
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if err != nil {
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return nil, fmt.Errorf("initializing kubectl client: %w", err)
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}
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waitCtx, cancel := context.WithTimeout(ctx, 2*time.Minute)
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defer cancel()
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if err := k.kubeAPIWaiter.Wait(waitCtx, k.client); err != nil {
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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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// 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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return nil, fmt.Errorf("failed to setup k8s version ConfigMap: %w", err)
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}
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// Annotate Node with the hash of the installed components
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if err := k.client.AnnotateNode(ctx, nodeName,
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constants.NodeKubernetesComponentsAnnotationKey, k8sComponentsConfigMap,
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); err != nil {
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return nil, fmt.Errorf("annotating node with Kubernetes components hash: %w", err)
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}
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// Step 3: configure & start kubernetes controllers
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log.Infof("Starting Kubernetes controllers and deployments")
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setupPodNetworkInput := k8sapi.SetupPodNetworkInput{
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CloudProvider: k.cloudProvider,
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NodeName: nodeName,
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FirstNodePodCIDR: nodePodCIDR,
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SubnetworkPodCIDR: subnetworkPodCIDR,
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LoadBalancerEndpoint: controlPlaneEndpoint,
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}
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var helmReleases helm.Releases
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if err := json.Unmarshal(helmReleasesRaw, &helmReleases); err != nil {
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return nil, fmt.Errorf("unmarshalling helm releases: %w", err)
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}
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if err = k.helmClient.InstallCilium(ctx, k.client, helmReleases.Cilium, setupPodNetworkInput); err != nil {
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return nil, fmt.Errorf("installing pod network: %w", err)
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}
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var controlPlaneIP string
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if strings.Contains(controlPlaneEndpoint, ":") {
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controlPlaneIP, _, err = net.SplitHostPort(controlPlaneEndpoint)
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if err != nil {
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return nil, fmt.Errorf("parsing control plane endpoint: %w", err)
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}
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} else {
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controlPlaneIP = controlPlaneEndpoint
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}
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if err := k.initialMeasurements.SetEnforced(enforcedPCRs); err != nil {
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return nil, err
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}
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measurementsJSON, err := json.Marshal(k.initialMeasurements)
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if err != nil {
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return nil, fmt.Errorf("marshaling initial measurements: %w", err)
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}
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serviceConfig := constellationServicesConfig{
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initialMeasurementsJSON: measurementsJSON,
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measurementSalt: measurementSalt,
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subnetworkPodCIDR: subnetworkPodCIDR,
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cloudServiceAccountURI: cloudServiceAccountURI,
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loadBalancerIP: controlPlaneIP,
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}
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extraVals, err := k.setupExtraVals(ctx, serviceConfig)
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if err != nil {
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return nil, fmt.Errorf("setting up extraVals: %w", err)
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}
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if err = k.helmClient.InstallConstellationServices(ctx, helmReleases.ConstellationServices, extraVals); err != nil {
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return nil, fmt.Errorf("installing constellation-services: %w", err)
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}
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if err := k.setupInternalConfigMap(ctx, strconv.FormatBool(azureCVM)); err != nil {
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return nil, fmt.Errorf("failed to setup internal ConfigMap: %w", err)
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}
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// cert-manager is necessary for our operator deployments.
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if err = k.helmClient.InstallCertManager(ctx, helmReleases.CertManager); err != nil {
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return nil, fmt.Errorf("installing cert-manager: %w", err)
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}
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operatorVals, err := k.setupOperatorVals(ctx)
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if err != nil {
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return nil, fmt.Errorf("setting up operator vals: %w", err)
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}
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if err = k.helmClient.InstallOperators(ctx, helmReleases.Operators, operatorVals); err != nil {
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return nil, fmt.Errorf("installing operators: %w", err)
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}
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k.clusterUtil.FixCilium(log)
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return k.GetKubeconfig()
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}
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// JoinCluster joins existing Kubernetes cluster.
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func (k *KubeWrapper) JoinCluster(ctx context.Context, args *kubeadm.BootstrapTokenDiscovery, peerRole role.Role, versionString string, k8sComponents components.Components, log *logger.Logger) error {
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log.With("k8sComponents", k8sComponents).Infof("Installing provided kubernetes components")
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if err := k.clusterUtil.InstallComponents(ctx, k8sComponents); err != nil {
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return fmt.Errorf("installing kubernetes components: %w", err)
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}
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// Step 1: retrieve cloud metadata for Kubernetes configuration
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log.Infof("Retrieving node metadata")
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instance, err := k.providerMetadata.Self(ctx)
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if err != nil {
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return fmt.Errorf("retrieving own instance metadata: %w", err)
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}
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providerID := instance.ProviderID
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nodeInternalIP := instance.VPCIP
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nodeName, err := k8sCompliantHostname(instance.Name)
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if err != nil {
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return fmt.Errorf("generating node name: %w", err)
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}
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loadbalancerEndpoint, err := k.providerMetadata.GetLoadBalancerEndpoint(ctx)
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if err != nil {
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return fmt.Errorf("retrieving own instance metadata: %w", err)
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}
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log.With(
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zap.String("nodeName", nodeName),
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zap.String("providerID", providerID),
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zap.String("nodeIP", nodeInternalIP),
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).Infof("Setting information for node")
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// Step 2: configure kubeadm join config
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ccmSupported := cloudprovider.FromString(k.cloudProvider) == cloudprovider.Azure ||
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cloudprovider.FromString(k.cloudProvider) == cloudprovider.GCP
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joinConfig := k.configProvider.JoinConfiguration(ccmSupported)
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joinConfig.SetAPIServerEndpoint(args.APIServerEndpoint)
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joinConfig.SetToken(args.Token)
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joinConfig.AppendDiscoveryTokenCaCertHash(args.CACertHashes[0])
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joinConfig.SetNodeIP(nodeInternalIP)
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joinConfig.SetNodeName(nodeName)
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joinConfig.SetProviderID(providerID)
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if peerRole == role.ControlPlane {
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joinConfig.SetControlPlane(nodeInternalIP)
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}
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joinConfigYAML, err := joinConfig.Marshal()
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if err != nil {
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return fmt.Errorf("encoding kubeadm join configuration as YAML: %w", err)
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}
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log.With(zap.String("apiServerEndpoint", args.APIServerEndpoint)).Infof("Joining Kubernetes cluster")
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if err := k.clusterUtil.JoinCluster(ctx, joinConfigYAML, peerRole, loadbalancerEndpoint, log); err != nil {
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return fmt.Errorf("joining cluster: %v; %w ", string(joinConfigYAML), err)
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}
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k.clusterUtil.FixCilium(log)
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return nil
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}
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// GetKubeconfig returns the current nodes kubeconfig of stored on disk.
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func (k *KubeWrapper) GetKubeconfig() ([]byte, error) {
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return k.kubeconfigReader.ReadKubeconfig()
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}
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// setupK8sComponentsConfigMap applies a ConfigMap (cf. server-side apply) to store the installed k8s components.
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// It returns the name of the ConfigMap.
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func (k *KubeWrapper) setupK8sComponentsConfigMap(ctx context.Context, components components.Components, clusterVersion string) (string, error) {
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componentsMarshalled, err := json.Marshal(components)
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if err != nil {
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return "", fmt.Errorf("marshalling component versions: %w", err)
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}
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componentsHash := components.GetHash()
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componentConfigMapName := fmt.Sprintf("k8s-components-%s", strings.ReplaceAll(componentsHash, ":", "-"))
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componentsConfig := corev1.ConfigMap{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "v1",
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Kind: "ConfigMap",
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},
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Immutable: toPtr(true),
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ObjectMeta: metav1.ObjectMeta{
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Name: componentConfigMapName,
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Namespace: "kube-system",
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},
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Data: map[string]string{
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constants.ComponentsListKey: string(componentsMarshalled),
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constants.K8sVersionFieldName: clusterVersion,
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},
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}
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if err := k.client.CreateConfigMap(ctx, componentsConfig); err != nil {
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return "", fmt.Errorf("apply in KubeWrapper.setupK8sVersionConfigMap(..) for components config map failed with: %w", err)
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}
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return componentConfigMapName, nil
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}
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// setupInternalConfigMap applies a ConfigMap (cf. server-side apply) to store information that is not supposed to be user-editable.
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func (k *KubeWrapper) setupInternalConfigMap(ctx context.Context, azureCVM string) error {
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config := corev1.ConfigMap{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "v1",
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Kind: "ConfigMap",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: constants.InternalConfigMap,
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Namespace: "kube-system",
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},
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Data: map[string]string{
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constants.AzureCVM: azureCVM,
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},
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}
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// We do not use the client's Apply method here since we are handling a kubernetes-native type.
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// These types don't implement our custom Marshaler interface.
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if err := k.client.CreateConfigMap(ctx, config); err != nil {
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return fmt.Errorf("apply in KubeWrapper.setupInternalConfigMap failed with: %w", err)
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}
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return nil
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}
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// k8sCompliantHostname transforms a hostname to an RFC 1123 compliant, lowercase subdomain as required by Kubernetes node names.
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// The following regex is used by k8s for validation: /^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$/ .
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// Only a simple heuristic is used for now (to lowercase, replace underscores).
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func k8sCompliantHostname(in string) (string, error) {
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hostname := strings.ToLower(in)
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hostname = strings.ReplaceAll(hostname, "_", "-")
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if !validHostnameRegex.MatchString(hostname) {
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return "", fmt.Errorf("failed to generate a Kubernetes compliant hostname for %s", in)
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}
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return hostname, nil
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}
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// StartKubelet starts the kubelet service.
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func (k *KubeWrapper) StartKubelet(log *logger.Logger) error {
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if err := k.clusterUtil.StartKubelet(); err != nil {
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return fmt.Errorf("starting kubelet: %w", err)
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}
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k.clusterUtil.FixCilium(log)
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return nil
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}
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// getIPAddr retrieves to default sender IP used for outgoing connection.
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func getIPAddr() (string, error) {
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conn, err := net.Dial("udp", "8.8.8.8:80")
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if err != nil {
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return "", err
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}
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defer conn.Close()
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localAddr := conn.LocalAddr().(*net.UDPAddr)
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return localAddr.IP.String(), nil
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}
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// setupExtraVals create a helm values map for consumption by helm-install.
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// Will move to a more dedicated place once that place becomes apparent.
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func (k *KubeWrapper) setupExtraVals(ctx context.Context, serviceConfig constellationServicesConfig) (map[string]any, error) {
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extraVals := map[string]any{
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"join-service": map[string]any{
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"measurements": string(serviceConfig.initialMeasurementsJSON),
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"measurementSalt": base64.StdEncoding.EncodeToString(serviceConfig.measurementSalt),
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},
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"ccm": map[string]any{},
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"verification-service": map[string]any{
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"loadBalancerIP": serviceConfig.loadBalancerIP,
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},
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"konnectivity": map[string]any{
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"loadBalancerIP": serviceConfig.loadBalancerIP,
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},
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}
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instance, err := k.providerMetadata.Self(ctx)
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if err != nil {
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return nil, fmt.Errorf("retrieving current instance: %w", err)
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}
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switch cloudprovider.FromString(k.cloudProvider) {
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case cloudprovider.GCP:
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uid, err := k.providerMetadata.UID(ctx)
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if err != nil {
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return nil, fmt.Errorf("getting uid: %w", err)
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}
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projectID, _, _, err := gcpshared.SplitProviderID(instance.ProviderID)
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if err != nil {
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return nil, fmt.Errorf("splitting providerID: %w", err)
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}
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serviceAccountKey, err := gcpshared.ServiceAccountKeyFromURI(serviceConfig.cloudServiceAccountURI)
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if err != nil {
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return nil, fmt.Errorf("getting service account key: %w", err)
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}
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rawKey, err := json.Marshal(serviceAccountKey)
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if err != nil {
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return nil, fmt.Errorf("marshaling service account key: %w", err)
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}
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ccmVals, ok := extraVals["ccm"].(map[string]any)
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if !ok {
|
|
return nil, errors.New("invalid ccm values")
|
|
}
|
|
ccmVals["GCP"] = map[string]any{
|
|
"projectID": projectID,
|
|
"uid": uid,
|
|
"secretData": string(rawKey),
|
|
"subnetworkPodCIDR": serviceConfig.subnetworkPodCIDR,
|
|
}
|
|
|
|
case cloudprovider.Azure:
|
|
ccmAzure, ok := k.providerMetadata.(ccmConfigGetter)
|
|
if !ok {
|
|
return nil, errors.New("invalid cloud provider metadata for Azure")
|
|
}
|
|
|
|
ccmConfig, err := ccmAzure.GetCCMConfig(ctx, instance.ProviderID, serviceConfig.cloudServiceAccountURI)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("creating ccm secret: %w", err)
|
|
}
|
|
|
|
ccmVals, ok := extraVals["ccm"].(map[string]any)
|
|
if !ok {
|
|
return nil, errors.New("invalid ccm values")
|
|
}
|
|
ccmVals["Azure"] = map[string]any{
|
|
"azureConfig": string(ccmConfig),
|
|
"subnetworkPodCIDR": serviceConfig.subnetworkPodCIDR,
|
|
}
|
|
|
|
subscriptionID, resourceGroup, err := azureshared.BasicsFromProviderID(instance.ProviderID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
creds, err := azureshared.ApplicationCredentialsFromURI(serviceConfig.cloudServiceAccountURI)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
extraVals["autoscaler"] = map[string]any{
|
|
"Azure": map[string]any{
|
|
"clientID": creds.AppClientID,
|
|
"clientSecret": creds.ClientSecretValue,
|
|
"resourceGroup": resourceGroup,
|
|
"subscriptionID": subscriptionID,
|
|
"tenantID": creds.TenantID,
|
|
},
|
|
}
|
|
|
|
}
|
|
return extraVals, nil
|
|
}
|
|
|
|
func (k *KubeWrapper) setupOperatorVals(ctx context.Context) (map[string]any, error) {
|
|
uid, err := k.providerMetadata.UID(ctx)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("retrieving constellation UID: %w", err)
|
|
}
|
|
|
|
return map[string]any{
|
|
"constellation-operator": map[string]any{
|
|
"constellationUID": uid,
|
|
},
|
|
}, nil
|
|
}
|
|
|
|
type ccmConfigGetter interface {
|
|
GetCCMConfig(ctx context.Context, providerID, cloudServiceAccountURI string) ([]byte, error)
|
|
}
|
|
|
|
type constellationServicesConfig struct {
|
|
initialMeasurementsJSON []byte
|
|
measurementSalt []byte
|
|
subnetworkPodCIDR string
|
|
cloudServiceAccountURI string
|
|
loadBalancerIP string
|
|
}
|
|
|
|
func toPtr[T any](v T) *T {
|
|
return &v
|
|
}
|