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clustermesh.go
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clustermesh.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package clustermesh
import (
"bytes"
"context"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"regexp"
"strconv"
"strings"
"text/tabwriter"
"time"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/intstr"
"github.com/blang/semver/v4"
"github.com/cilium/cilium/api/v1/models"
ciliumv2 "github.com/cilium/cilium/pkg/k8s/apis/cilium.io/v2"
"github.com/cilium/cilium/pkg/versioncheck"
"github.com/cilium/cilium-cli/defaults"
"github.com/cilium/cilium-cli/internal/certs"
"github.com/cilium/cilium-cli/internal/helm"
"github.com/cilium/cilium-cli/internal/utils"
"github.com/cilium/cilium-cli/k8s"
"github.com/cilium/cilium-cli/status"
)
const (
configNameClusterID = "cluster-id"
configNameClusterName = "cluster-name"
configNameTunnel = "tunnel"
caSuffix = ".etcd-client-ca.crt"
keySuffix = ".etcd-client.key"
certSuffix = ".etcd-client.crt"
)
var (
replicas = int32(1)
deploymentMaxSurge = intstr.FromInt(1)
deploymentMaxUnavailable = intstr.FromInt(1)
secretDefaultMode = int32(0400)
)
var clusterRole = &rbacv1.ClusterRole{
ObjectMeta: metav1.ObjectMeta{
Name: defaults.ClusterMeshClusterRoleName,
},
Rules: []rbacv1.PolicyRule{
{
APIGroups: []string{"discovery.k8s.io"},
Resources: []string{"endpointslices"},
Verbs: []string{"get", "list", "watch"},
},
{
APIGroups: []string{""},
Resources: []string{"namespaces", "services", "endpoints"},
Verbs: []string{"get", "list", "watch"},
},
{
APIGroups: []string{"apiextensions.k8s.io"},
Resources: []string{"customresourcedefinitions"},
Verbs: []string{"list"},
},
{
APIGroups: []string{"cilium.io"},
Resources: []string{
"ciliumnodes",
"ciliumnodes/status",
"ciliumexternalworkloads",
"ciliumexternalworkloads/status",
"ciliumidentities",
"ciliumidentities/status",
"ciliumendpoints",
"ciliumendpoints/status",
},
Verbs: []string{"*"},
},
},
}
func (k *K8sClusterMesh) generateService() (*corev1.Service, error) {
svc := &corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: defaults.ClusterMeshServiceName,
Labels: defaults.ClusterMeshDeploymentLabels,
Annotations: map[string]string{},
},
Spec: corev1.ServiceSpec{
Type: corev1.ServiceTypeClusterIP,
Ports: []corev1.ServicePort{
{Port: int32(2379)},
},
Selector: defaults.ClusterMeshDeploymentLabels,
},
}
if k.params.ServiceType != "" {
if k.params.ServiceType == "NodePort" {
k.Log("⚠️ Using service type NodePort may fail when nodes are removed from the cluster!")
}
svc.Spec.Type = corev1.ServiceType(k.params.ServiceType)
} else {
switch k.flavor.Kind {
case k8s.KindGKE:
k.Log("🔮 Auto-exposing service within GCP VPC (cloud.google.com/load-balancer-type=Internal)")
svc.Spec.Type = corev1.ServiceTypeLoadBalancer
svc.ObjectMeta.Annotations["cloud.google.com/load-balancer-type"] = "Internal"
// if all the clusters are in the same region the next annotation can be removed
svc.ObjectMeta.Annotations["networking.gke.io/internal-load-balancer-allow-global-access"] = "true"
case k8s.KindAKS:
k.Log("🔮 Auto-exposing service within Azure VPC (service.beta.kubernetes.io/azure-load-balancer-internal)")
svc.Spec.Type = corev1.ServiceTypeLoadBalancer
svc.ObjectMeta.Annotations["service.beta.kubernetes.io/azure-load-balancer-internal"] = "true"
case k8s.KindEKS:
k.Log("🔮 Auto-exposing service within AWS VPC (service.beta.kubernetes.io/aws-load-balancer-internal: 0.0.0.0/0")
svc.Spec.Type = corev1.ServiceTypeLoadBalancer
svc.ObjectMeta.Annotations["service.beta.kubernetes.io/aws-load-balancer-internal"] = "0.0.0.0/0"
default:
return nil, fmt.Errorf("cannot auto-detect service type, please specify using '--service-type' option")
}
}
return svc, nil
}
var initContainerArgs = []string{`rm -rf /var/run/etcd/*;
export ETCDCTL_API=3;
/usr/local/bin/etcd --data-dir=/var/run/etcd --name=clustermesh-apiserver --listen-client-urls=http://127.0.0.1:2379 --advertise-client-urls=http://127.0.0.1:2379 --initial-cluster-token=clustermesh-apiserver --initial-cluster-state=new --auto-compaction-retention=1 &
export rootpw="$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)";
echo $rootpw | etcdctl --interactive=false user add root;
etcdctl user grant-role root root;
export vmpw="$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)";
echo $vmpw | etcdctl --interactive=false user add externalworkload;
etcdctl role add externalworkload;
etcdctl role grant-permission externalworkload --from-key read '';
etcdctl role grant-permission externalworkload readwrite --prefix cilium/state/noderegister/v1/;
etcdctl role grant-permission externalworkload readwrite --prefix cilium/.initlock/;
etcdctl user grant-role externalworkload externalworkload;
export remotepw="$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)";
echo $remotepw | etcdctl --interactive=false user add remote;
etcdctl role add remote;
etcdctl role grant-permission remote --from-key read '';
etcdctl user grant-role remote remote;
etcdctl auth enable;
exit`}
func (k *K8sClusterMesh) apiserverImage(imagePathMode utils.ImagePathMode) string {
return utils.BuildImagePath(k.params.ApiserverImage, k.params.ApiserverVersion, defaults.ClusterMeshApiserverImage, k.imageVersion, imagePathMode)
}
func (k *K8sClusterMesh) etcdImage() string {
etcdVersion := "v3.5.4"
if k.clusterArch == "amd64" {
return "quay.io/coreos/etcd:" + etcdVersion
}
return "quay.io/coreos/etcd:" + etcdVersion + "-" + k.clusterArch
}
func (k *K8sClusterMesh) etcdEnvs() []corev1.EnvVar {
envs := []corev1.EnvVar{
{
Name: "ETCDCTL_API",
Value: "3",
},
{
Name: "HOSTNAME_IP",
ValueFrom: &corev1.EnvVarSource{
FieldRef: &corev1.ObjectFieldSelector{
FieldPath: "status.podIP",
},
},
},
}
if k.clusterArch == "arm64" {
envs = append(envs, corev1.EnvVar{
Name: "ETCD_UNSUPPORTED_ARCH",
Value: "arm64",
})
}
return envs
}
func (k *K8sClusterMesh) generateDeployment(clustermeshApiserverArgs []string) *appsv1.Deployment {
deployment := &appsv1.Deployment{
ObjectMeta: metav1.ObjectMeta{
Name: defaults.ClusterMeshDeploymentName,
Labels: defaults.ClusterMeshDeploymentLabels,
},
Spec: appsv1.DeploymentSpec{
Replicas: &replicas,
Selector: &metav1.LabelSelector{
MatchLabels: defaults.ClusterMeshDeploymentLabels,
},
Strategy: appsv1.DeploymentStrategy{
Type: appsv1.RollingUpdateDeploymentStrategyType,
RollingUpdate: &appsv1.RollingUpdateDeployment{
MaxUnavailable: &deploymentMaxUnavailable,
MaxSurge: &deploymentMaxSurge,
},
},
Template: corev1.PodTemplateSpec{
ObjectMeta: metav1.ObjectMeta{
Name: defaults.ClusterMeshDeploymentName,
Labels: defaults.ClusterMeshDeploymentLabels,
},
Spec: corev1.PodSpec{
RestartPolicy: corev1.RestartPolicyAlways,
ServiceAccountName: defaults.ClusterMeshServiceAccountName,
Containers: []corev1.Container{
{
Name: "etcd",
Command: []string{"/usr/local/bin/etcd"},
Args: []string{
"--data-dir=/var/run/etcd",
"--name=clustermesh-apiserver",
"--client-cert-auth",
"--trusted-ca-file=/var/lib/etcd-secrets/ca.crt",
"--cert-file=/var/lib/etcd-secrets/tls.crt",
"--key-file=/var/lib/etcd-secrets/tls.key",
// Surrounding the IPv4 address with brackets works in this case, since etcd
// uses net.SplitHostPort() internally and it accepts that format.
"--listen-client-urls=https://127.0.0.1:2379,https://[$(HOSTNAME_IP)]:2379",
"--advertise-client-urls=https://[$(HOSTNAME_IP)]:2379",
"--initial-cluster-token=clustermesh-apiserver",
"--auto-compaction-retention=1",
},
Image: k.etcdImage(),
ImagePullPolicy: corev1.PullIfNotPresent,
Env: k.etcdEnvs(),
VolumeMounts: []corev1.VolumeMount{
{
Name: "etcd-server-secrets",
MountPath: "/var/lib/etcd-secrets",
ReadOnly: true,
},
{
Name: "etcd-data-dir",
MountPath: "/var/run/etcd",
},
},
},
{
Name: "apiserver",
Command: []string{"/usr/bin/clustermesh-apiserver"},
Args: append(clustermeshApiserverArgs,
"--cluster-name="+k.clusterName,
"--cluster-id="+k.clusterID,
"--kvstore-opt",
"etcd.config=/var/lib/cilium/etcd-config.yaml",
),
Image: k.apiserverImage(utils.ImagePathIncludeDigest),
ImagePullPolicy: corev1.PullIfNotPresent,
Env: []corev1.EnvVar{
{
Name: "CILIUM_CLUSTER_NAME",
ValueFrom: &corev1.EnvVarSource{
ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.ConfigMapName,
},
Key: configNameClusterName,
},
},
},
{
Name: "CILIUM_CLUSTER_ID",
ValueFrom: &corev1.EnvVarSource{
ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.ConfigMapName,
},
Key: configNameClusterID,
},
},
},
{
Name: "CILIUM_IDENTITY_ALLOCATION_MODE",
ValueFrom: &corev1.EnvVarSource{
ConfigMapKeyRef: &corev1.ConfigMapKeySelector{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.ConfigMapName,
},
Key: "identity-allocation-mode",
},
},
},
},
VolumeMounts: []corev1.VolumeMount{
{
Name: "etcd-admin-client",
MountPath: "/var/lib/cilium/etcd-secrets",
ReadOnly: true,
},
},
},
},
InitContainers: []corev1.Container{
{
Name: "etcd-init",
Command: []string{"/bin/sh", "-c"},
Args: initContainerArgs,
Image: k.etcdImage(),
ImagePullPolicy: corev1.PullIfNotPresent,
Env: k.etcdEnvs(),
VolumeMounts: []corev1.VolumeMount{
{
Name: "etcd-data-dir",
MountPath: "/var/run/etcd",
},
},
},
},
Volumes: []corev1.Volume{
{
Name: "etcd-data-dir",
VolumeSource: corev1.VolumeSource{
EmptyDir: &corev1.EmptyDirVolumeSource{},
},
},
{
Name: "etcd-server-secrets",
VolumeSource: corev1.VolumeSource{
Projected: &corev1.ProjectedVolumeSource{
DefaultMode: &secretDefaultMode,
Sources: []corev1.VolumeProjection{
{
Secret: &corev1.SecretProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.CASecretName,
},
Items: []corev1.KeyToPath{
{
Key: defaults.CASecretCertName,
Path: "ca.crt",
},
},
},
},
{
Secret: &corev1.SecretProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.ClusterMeshServerSecretName,
},
},
},
},
},
},
},
{
Name: "etcd-admin-client",
VolumeSource: corev1.VolumeSource{
Projected: &corev1.ProjectedVolumeSource{
DefaultMode: &secretDefaultMode,
Sources: []corev1.VolumeProjection{
{
Secret: &corev1.SecretProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.CASecretName,
},
Items: []corev1.KeyToPath{
{
Key: defaults.CASecretCertName,
Path: "ca.crt",
},
},
},
},
{
Secret: &corev1.SecretProjection{
LocalObjectReference: corev1.LocalObjectReference{
Name: defaults.ClusterMeshAdminSecretName,
},
},
},
},
},
},
},
},
},
},
},
}
return deployment
}
type k8sClusterMeshImplementation interface {
CreateSecret(ctx context.Context, namespace string, secret *corev1.Secret, opts metav1.CreateOptions) (*corev1.Secret, error)
PatchSecret(ctx context.Context, namespace, name string, pt types.PatchType, data []byte, opts metav1.PatchOptions) (*corev1.Secret, error)
DeleteSecret(ctx context.Context, namespace, name string, opts metav1.DeleteOptions) error
GetSecret(ctx context.Context, namespace, name string, opts metav1.GetOptions) (*corev1.Secret, error)
CreateServiceAccount(ctx context.Context, namespace string, account *corev1.ServiceAccount, opts metav1.CreateOptions) (*corev1.ServiceAccount, error)
DeleteServiceAccount(ctx context.Context, namespace, name string, opts metav1.DeleteOptions) error
CreateClusterRole(ctx context.Context, role *rbacv1.ClusterRole, opts metav1.CreateOptions) (*rbacv1.ClusterRole, error)
DeleteClusterRole(ctx context.Context, name string, opts metav1.DeleteOptions) error
CreateClusterRoleBinding(ctx context.Context, role *rbacv1.ClusterRoleBinding, opts metav1.CreateOptions) (*rbacv1.ClusterRoleBinding, error)
DeleteClusterRoleBinding(ctx context.Context, name string, opts metav1.DeleteOptions) error
GetConfigMap(ctx context.Context, namespace, name string, opts metav1.GetOptions) (*corev1.ConfigMap, error)
CreateDeployment(ctx context.Context, namespace string, deployment *appsv1.Deployment, opts metav1.CreateOptions) (*appsv1.Deployment, error)
GetDeployment(ctx context.Context, namespace, name string, opts metav1.GetOptions) (*appsv1.Deployment, error)
DeleteDeployment(ctx context.Context, namespace, name string, opts metav1.DeleteOptions) error
CheckDeploymentStatus(ctx context.Context, namespace, deployment string) error
CreateService(ctx context.Context, namespace string, service *corev1.Service, opts metav1.CreateOptions) (*corev1.Service, error)
DeleteService(ctx context.Context, namespace, name string, opts metav1.DeleteOptions) error
GetService(ctx context.Context, namespace, name string, opts metav1.GetOptions) (*corev1.Service, error)
PatchDaemonSet(ctx context.Context, namespace, name string, pt types.PatchType, data []byte, opts metav1.PatchOptions) (*appsv1.DaemonSet, error)
GetDaemonSet(ctx context.Context, namespace, name string, options metav1.GetOptions) (*appsv1.DaemonSet, error)
ListNodes(ctx context.Context, options metav1.ListOptions) (*corev1.NodeList, error)
ListPods(ctx context.Context, namespace string, options metav1.ListOptions) (*corev1.PodList, error)
AutodetectFlavor(ctx context.Context) k8s.Flavor
CiliumStatus(ctx context.Context, namespace, pod string) (*models.StatusResponse, error)
ClusterName() string
ListCiliumExternalWorkloads(ctx context.Context, opts metav1.ListOptions) (*ciliumv2.CiliumExternalWorkloadList, error)
GetCiliumExternalWorkload(ctx context.Context, name string, opts metav1.GetOptions) (*ciliumv2.CiliumExternalWorkload, error)
CreateCiliumExternalWorkload(ctx context.Context, cew *ciliumv2.CiliumExternalWorkload, opts metav1.CreateOptions) (*ciliumv2.CiliumExternalWorkload, error)
DeleteCiliumExternalWorkload(ctx context.Context, name string, opts metav1.DeleteOptions) error
GetRunningCiliumVersion(ctx context.Context, namespace string) (string, error)
ListCiliumEndpoints(ctx context.Context, namespace string, options metav1.ListOptions) (*ciliumv2.CiliumEndpointList, error)
GetPlatform(ctx context.Context) (*k8s.Platform, error)
CiliumLogs(ctx context.Context, namespace, pod string, since time.Time, filter *regexp.Regexp) (string, error)
GetHelmState(ctx context.Context, namespace string, secretName string) (*helm.State, error)
}
type K8sClusterMesh struct {
client k8sClusterMeshImplementation
certManager *certs.CertManager
statusCollector *status.K8sStatusCollector
flavor k8s.Flavor
params Parameters
clusterName string
clusterID string
imageVersion string
clusterArch string
}
type Parameters struct {
Namespace string
ServiceType string
DestinationContext string
Wait bool
WaitDuration time.Duration
DestinationEndpoints []string
SourceEndpoints []string
SkipServiceCheck bool
ApiserverImage string
ApiserverVersion string
CreateCA bool
Writer io.Writer
Labels map[string]string
IPv4AllocCIDR string
IPv6AllocCIDR string
All bool
ConfigOverwrites []string
Retries int
HelmValuesSecretName string
Output string
}
func (p Parameters) validateParams() error {
if p.ApiserverImage != defaults.ClusterMeshApiserverImage {
return nil
} else if err := utils.CheckVersion(p.ApiserverVersion); err != nil {
return err
}
return nil
}
func (p Parameters) waitTimeout() time.Duration {
if p.WaitDuration != time.Duration(0) {
return p.WaitDuration
}
return time.Minute * 15
}
func NewK8sClusterMesh(client k8sClusterMeshImplementation, p Parameters) *K8sClusterMesh {
return &K8sClusterMesh{
client: client,
params: p,
certManager: certs.NewCertManager(client, certs.Parameters{Namespace: p.Namespace}),
}
}
func (k *K8sClusterMesh) Log(format string, a ...interface{}) {
fmt.Fprintf(k.params.Writer, format+"\n", a...)
}
func (k *K8sClusterMesh) GetClusterConfig(ctx context.Context) error {
k.flavor = k.client.AutodetectFlavor(ctx)
cm, err := k.client.GetConfigMap(ctx, k.params.Namespace, defaults.ConfigMapName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("unable to retrieve ConfigMap %q: %w", defaults.ConfigMapName, err)
}
clusterID := cm.Data[configNameClusterID]
if clusterID == "" {
clusterID = "0"
}
k.clusterID = clusterID
clusterName := cm.Data[configNameClusterName]
if clusterName == "" {
clusterName = "default"
}
k.clusterName = clusterName
if clusterID == "0" || clusterName == "default" {
k.Log("⚠️ Cluster not configured for clustermesh, use '--cluster-id' and '--cluster-name' with 'cilium install'. External workloads may still be configured.")
}
return nil
}
func (k *K8sClusterMesh) Disable(ctx context.Context) error {
k.Log("🔥 Deleting clustermesh-apiserver...")
k.client.DeleteService(ctx, k.params.Namespace, defaults.ClusterMeshServiceName, metav1.DeleteOptions{})
k.client.DeleteDeployment(ctx, k.params.Namespace, defaults.ClusterMeshDeploymentName, metav1.DeleteOptions{})
k.client.DeleteClusterRoleBinding(ctx, defaults.ClusterMeshClusterRoleName, metav1.DeleteOptions{})
k.client.DeleteClusterRole(ctx, defaults.ClusterMeshClusterRoleName, metav1.DeleteOptions{})
k.client.DeleteServiceAccount(ctx, k.params.Namespace, defaults.ClusterMeshServiceAccountName, metav1.DeleteOptions{})
k.client.DeleteSecret(ctx, k.params.Namespace, defaults.ClusterMeshSecretName, metav1.DeleteOptions{})
k.deleteCertificates(ctx)
k.Log("✅ ClusterMesh disabled.")
return nil
}
func (p Parameters) validateForEnable() error {
switch corev1.ServiceType(p.ServiceType) {
case corev1.ServiceTypeClusterIP:
case corev1.ServiceTypeNodePort:
case corev1.ServiceTypeLoadBalancer:
case corev1.ServiceTypeExternalName:
case "":
default:
return fmt.Errorf("unknown service type %q", p.ServiceType)
}
return nil
}
func (k *K8sClusterMesh) Enable(ctx context.Context) error {
if err := k.params.validateParams(); err != nil {
return err
}
if err := k.params.validateForEnable(); err != nil {
return err
}
if err := k.GetClusterConfig(ctx); err != nil {
return err
}
var err error
k.imageVersion, err = k.client.GetRunningCiliumVersion(ctx, k.params.Namespace)
if err != nil {
return err
}
p, err := k.client.GetPlatform(ctx)
if err != nil {
return err
}
k.clusterArch = p.Arch
svc, err := k.generateService()
if err != nil {
return err
}
_, err = k.client.GetDeployment(ctx, k.params.Namespace, defaults.ClusterMeshDeploymentName, metav1.GetOptions{})
if err == nil {
k.Log("✅ ClusterMesh is already enabled")
return nil
}
if err := k.installCertificates(ctx); err != nil {
return err
}
k.Log("✨ Deploying clustermesh-apiserver from %s...", k.apiserverImage(utils.ImagePathExcludeDigest))
if _, err := k.client.CreateServiceAccount(ctx, k.params.Namespace, k8s.NewServiceAccount(defaults.ClusterMeshServiceAccountName), metav1.CreateOptions{}); err != nil {
return err
}
if _, err := k.client.CreateClusterRole(ctx, clusterRole, metav1.CreateOptions{}); err != nil {
return err
}
if _, err := k.client.CreateClusterRoleBinding(ctx, k8s.NewClusterRoleBinding(defaults.ClusterMeshClusterRoleName, k.params.Namespace, defaults.ClusterMeshServiceAccountName), metav1.CreateOptions{}); err != nil {
return err
}
for i, opt := range k.params.ConfigOverwrites {
if !strings.HasPrefix(opt, "--") {
k.params.ConfigOverwrites[i] = "--" + opt
}
}
if _, err := k.client.CreateDeployment(ctx, k.params.Namespace, k.generateDeployment(k.params.ConfigOverwrites), metav1.CreateOptions{}); err != nil {
return err
}
if _, err := k.client.CreateService(ctx, k.params.Namespace, svc, metav1.CreateOptions{}); err != nil {
return err
}
k.Log("✅ ClusterMesh enabled!")
return nil
}
type accessInformation struct {
ServiceIPs []string `json:"service_ips,omitempty"`
ServicePort int `json:"service_port,omitempty"`
ClusterID string `json:"cluster_id,omitempty"`
ClusterName string `json:"cluster_name,omitempty"`
CA []byte `json:"ca,omitempty"`
ClientCert []byte `json:"client_cert,omitempty"`
ClientKey []byte `json:"client_key,omitempty"`
ExternalWorkloadCert []byte `json:"external_workload_cert,omitempty"`
ExternalWorkloadKey []byte `json:"external_workload_key,omitempty"`
Tunnel string `json:"tunnel,omitempty"`
}
func (ai *accessInformation) etcdConfiguration() string {
cfg := "endpoints:\n"
cfg += "- https://" + ai.ClusterName + ".mesh.cilium.io:" + fmt.Sprintf("%d", ai.ServicePort) + "\n"
cfg += "trusted-ca-file: /var/lib/cilium/clustermesh/" + ai.ClusterName + caSuffix + "\n"
cfg += "key-file: /var/lib/cilium/clustermesh/" + ai.ClusterName + keySuffix + "\n"
cfg += "cert-file: /var/lib/cilium/clustermesh/" + ai.ClusterName + certSuffix + "\n"
return cfg
}
func (ai *accessInformation) validate() bool {
return ai.ClusterName != "" &&
ai.ClusterName != "default" &&
ai.ClusterID != "" &&
ai.ClusterID != "0"
}
func getDeprecatedName(secretName string) string {
switch secretName {
case defaults.ClusterMeshRemoteSecretName:
return defaults.ClusterMeshClientSecretName
case defaults.ClusterMeshServerSecretName,
defaults.ClusterMeshAdminSecretName,
defaults.ClusterMeshClientSecretName,
defaults.ClusterMeshExternalWorkloadSecretName:
return secretName + "s"
default:
return ""
}
}
// getDeprecatedSecret attempts to retrieve a secret using one or more deprecated names
// There are now multiple "layers" of deprecated secret names, so we call this function recursively if needed
func (k *K8sClusterMesh) getDeprecatedSecret(ctx context.Context, client k8sClusterMeshImplementation, secretName string, defaultName string) (*corev1.Secret, error) {
deprecatedSecretName := getDeprecatedName(secretName)
if deprecatedSecretName == "" {
return nil, fmt.Errorf("unable to get secret %q and no deprecated names to try", secretName)
}
k.Log("Trying to get secret %s by deprecated name %s", secretName, deprecatedSecretName)
secret, err := client.GetSecret(ctx, k.params.Namespace, deprecatedSecretName, metav1.GetOptions{})
if err != nil {
return k.getDeprecatedSecret(ctx, client, deprecatedSecretName, defaultName)
}
k.Log("⚠️ Deprecated secret name %q, should be changed to %q", secret.Name, defaultName)
return secret, err
}
// We had inconsistency in naming clustermesh secrets between Helm installation and Cilium CLI installation
// Cilium CLI was naming clustermesh secrets with trailing 's'. eg. 'clustermesh-apiserver-client-certs' instead of `clustermesh-apiserver-client-cert`
// This caused Cilium CLI 'clustermesh status' command to fail when Cilium is installed using Helm
// getSecret handles both secret names and logs warning if deprecated secret name is found
func (k *K8sClusterMesh) getSecret(ctx context.Context, client k8sClusterMeshImplementation, secretName string) (*corev1.Secret, error) {
secret, err := client.GetSecret(ctx, k.params.Namespace, secretName, metav1.GetOptions{})
if err != nil {
return k.getDeprecatedSecret(ctx, client, secretName, secretName)
}
return secret, err
}
func (k *K8sClusterMesh) extractAccessInformation(ctx context.Context, client k8sClusterMeshImplementation, endpoints []string, verbose bool, getExternalWorkLoadSecret bool) (*accessInformation, error) {
cm, err := client.GetConfigMap(ctx, k.params.Namespace, defaults.ConfigMapName, metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("unable to retrieve ConfigMap %q: %w", defaults.ConfigMapName, err)
}
if _, ok := cm.Data[configNameClusterName]; !ok {
return nil, fmt.Errorf("%s is not set in ConfigMap %q", configNameClusterName, defaults.ConfigMapName)
}
clusterID := cm.Data[configNameClusterID]
clusterName := cm.Data[configNameClusterName]
if verbose {
k.Log("✨ Extracting access information of cluster %s...", clusterName)
}
svc, err := client.GetService(ctx, k.params.Namespace, defaults.ClusterMeshServiceName, metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("unable to get clustermesh service %q: %w", defaults.ClusterMeshServiceName, err)
}
if verbose {
k.Log("🔑 Extracting secrets from cluster %s...", clusterName)
}
caSecret, err := client.GetSecret(ctx, k.params.Namespace, defaults.CASecretName, metav1.GetOptions{})
if err != nil {
return nil, fmt.Errorf("unable to get secret %q to retrieve CA: %s", defaults.CASecretName, err)
}
caCert, ok := caSecret.Data[defaults.CASecretCertName]
if !ok {
return nil, fmt.Errorf("secret %q does not contain CA cert %q", defaults.CASecretName, defaults.CASecretCertName)
}
meshSecret, err := k.getSecret(ctx, client, defaults.ClusterMeshRemoteSecretName)
if err != nil {
return nil, fmt.Errorf("unable to get client secret to access clustermesh service: %w", err)
}
clientKey, ok := meshSecret.Data[corev1.TLSPrivateKeyKey]
if !ok {
return nil, fmt.Errorf("secret %q does not contain key %q", meshSecret.Name, corev1.TLSPrivateKeyKey)
}
clientCert, ok := meshSecret.Data[corev1.TLSCertKey]
if !ok {
return nil, fmt.Errorf("secret %q does not contain key %q", meshSecret.Name, corev1.TLSCertKey)
}
// ExternalWorkload secret is created by 'clustermesh enable' command, but it isn't created by Helm. We should try to load this secret only when needed
var externalWorkloadKey, externalWorkloadCert []byte
if getExternalWorkLoadSecret {
externalWorkloadSecret, err := k.getSecret(ctx, client, defaults.ClusterMeshExternalWorkloadSecretName)
if err != nil {
return nil, fmt.Errorf("unable to get external workload secret to access clustermesh service")
}
externalWorkloadKey, ok = externalWorkloadSecret.Data[corev1.TLSPrivateKeyKey]
if !ok {
return nil, fmt.Errorf("secret %q does not contain key %q", externalWorkloadSecret.Namespace, corev1.TLSPrivateKeyKey)
}
externalWorkloadCert, ok = externalWorkloadSecret.Data[corev1.TLSCertKey]
if !ok {
return nil, fmt.Errorf("secret %q does not contain key %q", externalWorkloadSecret.Namespace, corev1.TLSCertKey)
}
}
ai := &accessInformation{
ClusterID: clusterID,
ClusterName: clusterName,
CA: caCert,
ClientKey: clientKey,
ClientCert: clientCert,
ExternalWorkloadKey: externalWorkloadKey,
ExternalWorkloadCert: externalWorkloadCert,
ServiceIPs: []string{},
Tunnel: cm.Data[configNameTunnel],
}
switch {
case len(endpoints) > 0:
for _, endpoint := range endpoints {
ip, port, err := net.SplitHostPort(endpoint)
if err != nil {
return nil, fmt.Errorf("invalid endpoint %q, must be IP:PORT: %w", endpoint, err)
}
intPort, err := strconv.Atoi(port)
if err != nil {
return nil, fmt.Errorf("invalid port %q: %w", port, err)
}
if ai.ServicePort == 0 {
ai.ServicePort = intPort
} else if ai.ServicePort != intPort {
return nil, fmt.Errorf("port mismatch (%d != %d), all endpoints must use the same port number", ai.ServicePort, intPort)
}
ai.ServiceIPs = append(ai.ServiceIPs, ip)
}
case svc.Spec.Type == corev1.ServiceTypeClusterIP:
if len(svc.Spec.Ports) == 0 {
return nil, fmt.Errorf("port of service could not be derived, service has no ports")
}
if svc.Spec.Ports[0].Port == 0 {
return nil, fmt.Errorf("port is not set in service")
}
ai.ServicePort = int(svc.Spec.Ports[0].Port)
if svc.Spec.ClusterIP == "" {
return nil, fmt.Errorf("IP of service could not be derived, service has no ClusterIP")
}
ai.ServiceIPs = append(ai.ServiceIPs, svc.Spec.ClusterIP)
case svc.Spec.Type == corev1.ServiceTypeNodePort:
if len(svc.Spec.Ports) == 0 {
return nil, fmt.Errorf("port of service could not be derived, service has no ports")
}
if svc.Spec.Ports[0].NodePort == 0 {
return nil, fmt.Errorf("nodeport is not set in service")
}
ai.ServicePort = int(svc.Spec.Ports[0].NodePort)
nodes, err := client.ListNodes(ctx, metav1.ListOptions{})
if err != nil {
return nil, fmt.Errorf("unable to list nodes in cluster: %w", err)
}
for _, node := range nodes.Items {
nodeIP := ""
for _, address := range node.Status.Addresses {
switch address.Type {
case corev1.NodeExternalIP:
nodeIP = address.Address
case corev1.NodeInternalIP:
if nodeIP == "" {
nodeIP = address.Address
}
}
}
if nodeIP != "" {
ai.ServiceIPs = append(ai.ServiceIPs, nodeIP)
// We can't really support multiple nodes as
// the NodePort will be different and the
// current use of hostAliases will lead to
// DNS-style RR requiring all endpoints to use
// the same port
break
}
}
k.Log("⚠️ Service type NodePort detected! Service may fail when nodes are removed from the cluster!")
case svc.Spec.Type == corev1.ServiceTypeLoadBalancer:
if len(svc.Spec.Ports) == 0 {
return nil, fmt.Errorf("port of service could not be derived, service has no ports")
}
ai.ServicePort = int(svc.Spec.Ports[0].Port)
for _, ingressStatus := range svc.Status.LoadBalancer.Ingress {
if ingressStatus.Hostname == "" {
ai.ServiceIPs = append(ai.ServiceIPs, ingressStatus.IP)
} else {
k.Log("Hostname based ingress detected, trying to resolve it")
ips, err := net.LookupHost(ingressStatus.Hostname)
if err != nil {
k.Log(fmt.Sprintf("Could not resolve the hostname of the ingress, falling back to the static IP. Error: %v", err))
ai.ServiceIPs = append(ai.ServiceIPs, ingressStatus.IP)
} else {
k.Log("Hostname resolved, using the found ip(s)")
ai.ServiceIPs = append(ai.ServiceIPs, ips...)
}
}
}
}
switch {
case len(ai.ServiceIPs) > 0:
if verbose {
k.Log("ℹ️ Found ClusterMesh service IPs: %s", ai.ServiceIPs)
}
default:
return nil, fmt.Errorf("unable to derive service IPs automatically")
}
return ai, nil
}
func (k *K8sClusterMesh) patchConfig(ctx context.Context, client k8sClusterMeshImplementation, ai *accessInformation) error {
_, err := client.GetSecret(ctx, k.params.Namespace, defaults.ClusterMeshSecretName, metav1.GetOptions{})
if err != nil {
k.Log("🔑 Secret %s does not exist yet, creating it...", defaults.ClusterMeshSecretName)
_, err = client.CreateSecret(ctx, k.params.Namespace, k8s.NewSecret(defaults.ClusterMeshSecretName, k.params.Namespace, map[string][]byte{}), metav1.CreateOptions{})
if err != nil {
return fmt.Errorf("unable to create secret: %w", err)
}
}
k.Log("🔑 Patching existing secret %s...", defaults.ClusterMeshSecretName)
etcdBase64 := `"` + ai.ClusterName + `": "` + base64.StdEncoding.EncodeToString([]byte(ai.etcdConfiguration())) + `"`
caBase64 := `"` + ai.ClusterName + caSuffix + `": "` + base64.StdEncoding.EncodeToString(ai.CA) + `"`
keyBase64 := `"` + ai.ClusterName + keySuffix + `": "` + base64.StdEncoding.EncodeToString(ai.ClientKey) + `"`
certBase64 := `"` + ai.ClusterName + certSuffix + `": "` + base64.StdEncoding.EncodeToString(ai.ClientCert) + `"`
patch := []byte(`{"data":{` + etcdBase64 + `,` + caBase64 + `,` + keyBase64 + `,` + certBase64 + `}}`)
_, err = client.PatchSecret(ctx, k.params.Namespace, defaults.ClusterMeshSecretName, types.StrategicMergePatchType, patch, metav1.PatchOptions{})
if err != nil {
return fmt.Errorf("unable to patch secret %s with patch %q: %w", defaults.ClusterMeshSecretName, patch, err)
}
var aliases []string
for _, ip := range ai.ServiceIPs {
aliases = append(aliases, `{"ip":"`+ip+`", "hostnames":["`+ai.ClusterName+`.mesh.cilium.io"]}`)
}
patch = []byte(`{"spec":{"template":{"spec":{"hostAliases":[` + strings.Join(aliases, ",") + `]}}}}`)
k.Log("✨ Patching DaemonSet with IP aliases %s...", defaults.ClusterMeshSecretName)
_, err = client.PatchDaemonSet(ctx, k.params.Namespace, defaults.AgentDaemonSetName, types.StrategicMergePatchType, patch, metav1.PatchOptions{})
if err != nil {
return fmt.Errorf("unable to patch DaemonSet %s with patch %q: %w", defaults.AgentDaemonSetName, patch, err)
}
return nil
}
func (k *K8sClusterMesh) Connect(ctx context.Context) error {
remoteCluster, err := k8s.NewClient(k.params.DestinationContext, "")
if err != nil {
return fmt.Errorf("unable to create Kubernetes client to access remote cluster %q: %w", k.params.DestinationContext, err)
}
aiRemote, err := k.extractAccessInformation(ctx, remoteCluster, k.params.DestinationEndpoints, true, false)
if err != nil {
k.Log("❌ Unable to retrieve access information of remote cluster %q: %s", remoteCluster.ClusterName(), err)
return err
}
if !aiRemote.validate() {
return fmt.Errorf("remote cluster has non-unique name (%s) and/or ID (%s)", aiRemote.ClusterName, aiRemote.ClusterID)
}
aiLocal, err := k.extractAccessInformation(ctx, k.client, k.params.SourceEndpoints, true, false)
if err != nil {
k.Log("❌ Unable to retrieve access information of local cluster %q: %s", k.client.ClusterName(), err)
return err
}
if !aiLocal.validate() {
return fmt.Errorf("local cluster has the default name (cluster name: %s) and/or ID 0 (cluster ID: %s)",
aiLocal.ClusterName, aiLocal.ClusterID)
}
cid, err := strconv.Atoi(aiRemote.ClusterID)
if err != nil {
return fmt.Errorf("remote cluster has non-numeric cluster ID %s. Only numeric values 1-255 are allowed", aiRemote.ClusterID)
}
if cid < 1 || cid > 255 {
return fmt.Errorf("remote cluster has cluster ID %d out of acceptable range (1-255)", cid)
}
if aiRemote.ClusterName == aiLocal.ClusterName {
return fmt.Errorf("remote and local cluster have the same, non-unique name: %s", aiLocal.ClusterName)
}
if aiRemote.ClusterID == aiLocal.ClusterID {
return fmt.Errorf("remote and local cluster have the same, non-unique ID: %s", aiLocal.ClusterID)
}
k.Log("✨ Connecting cluster %s -> %s...", k.client.ClusterName(), remoteCluster.ClusterName())
if err := k.patchConfig(ctx, k.client, aiRemote); err != nil {
return err
}
k.Log("✨ Connecting cluster %s -> %s...", remoteCluster.ClusterName(), k.client.ClusterName())
if err := k.patchConfig(ctx, remoteCluster, aiLocal); err != nil {
return err
}
k.Log("✅ Connected cluster %s and %s!", k.client.ClusterName(), remoteCluster.ClusterName())
return nil
}