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hubble: fix enable/disable command when cilium-cli-helm-values does…
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… not exist

This commit fixes hubble enable and disable commands which are broken
when cilium initially was not installed with cilium-cli. In these cases
`cilium-cli-helm-values` secret does not exist and all `cilium hubble`
commands fail.

Since hubble components are cherry-picked from the generated helm manifests,
it should be safe to proceed without the full helm values state.

We should not write the new helm state to the cluster so that if in the
future other components need to use it, we don't inadvertently
over shadow real installation parameters.

Fixes: cilium#959

Signed-off-by: Olga Mirensky <[email protected]>
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@olga-mir
olga-mir committed Sep 16, 2022
1 parent 6453c72 commit a0846c1
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Showing 3 changed files with 145 additions and 32 deletions.
19 changes: 19 additions & 0 deletions defaults/defaults.go
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Original file line number Diff line number Diff line change
Expand Up @@ -101,3 +101,22 @@ var (
// CiliumPodSelector is the pod selector to be used for the Cilium agents.
CiliumPodSelector = "k8s-app=cilium"
)

// All hubble values from `cilium-config` configmap:
// https://github.com/cilium/cilium/blob/d9a04be9d714e5f5544cbca7ef8db7a151bfce96/install/kubernetes/cilium/templates/cilium-configmap.yaml#L709-L750
// this list is used to cherry-pick only hubble related values for configmap patch
// when running in unknown install state (i.e. when `cilium-cli-helm-values` doesn't exist)
var HubbleKeys = []string{
"enable-hubble",
"hubble-disable-tls",
"hubble-event-buffer-capacity",
"hubble-event-queue-size",
"hubble-flow-buffer-size",
"hubble-listen-address",
"hubble-metrics",
"hubble-metrics-server",
"hubble-socket-path",
"hubble-tls-cert-file",
"hubble-tls-client-ca-files",
"hubble-tls-key-file",
}
2 changes: 1 addition & 1 deletion go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -83,7 +83,7 @@ require (
github.com/dustin/go-humanize v1.0.0 // indirect
github.com/envoyproxy/go-control-plane v0.10.2-0.20220325020618-49ff273808a1 // indirect
github.com/envoyproxy/protoc-gen-validate v0.6.2 // indirect
github.com/evanphx/json-patch v5.6.0+incompatible // indirect
github.com/evanphx/json-patch v5.6.0+incompatible
github.com/exponent-io/jsonpath v0.0.0-20151013193312-d6023ce2651d // indirect
github.com/fatih/color v1.13.0 // indirect
github.com/fsnotify/fsnotify v1.5.4 // indirect
Expand Down
156 changes: 125 additions & 31 deletions hubble/hubble.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,9 +5,11 @@ package hubble

import (
"context"
"encoding/json"
"fmt"
"io"
"os"
"reflect"
"regexp"
"strings"
"time"
Expand All @@ -22,13 +24,15 @@ import (
"github.com/cilium/cilium/api/v1/models"
ciliumv2 "github.com/cilium/cilium/pkg/k8s/apis/cilium.io/v2"
"github.com/cilium/cilium/pkg/versioncheck"
jsonpatch "github.com/evanphx/json-patch"
"github.com/spf13/pflag"
"helm.sh/helm/v3/pkg/chartutil"
"helm.sh/helm/v3/pkg/cli/values"
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"
)

const (
Expand All @@ -50,6 +54,7 @@ type k8sHubbleImplementation interface {
CreateConfigMap(ctx context.Context, namespace string, config *corev1.ConfigMap, opts metav1.CreateOptions) (*corev1.ConfigMap, error)
DeleteConfigMap(ctx context.Context, namespace, name string, opts metav1.DeleteOptions) error
GetConfigMap(ctx context.Context, namespace, name string, opts metav1.GetOptions) (*corev1.ConfigMap, error)
PatchConfigMap(ctx context.Context, namespace, name string, pt types.PatchType, data []byte, opts metav1.PatchOptions) (*corev1.ConfigMap, error)
UpdateConfigMap(ctx context.Context, configMap *corev1.ConfigMap, opts metav1.UpdateOptions) (*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)
Expand All @@ -64,6 +69,7 @@ type k8sHubbleImplementation interface {
GetServerVersion() (*semver.Version, error)
GetHelmState(ctx context.Context, namespace string, secretName string) (*helm.State, error)
GetService(ctx context.Context, namespace, name string, opts metav1.GetOptions) (*corev1.Service, error)
GetRunningCiliumVersion(ctx context.Context, namespace string) (string, error)
CiliumLogs(ctx context.Context, namespace, pod string, since time.Time, filter *regexp.Regexp) (string, error)
}

Expand Down Expand Up @@ -150,18 +156,43 @@ func (p *Parameters) validateParams() error {
return nil
}

func NewK8sHubble(ctx context.Context, client k8sHubbleImplementation, p Parameters) (*K8sHubble, error) {
cm := certs.NewCertManager(client, certs.Parameters{Namespace: p.Namespace})
helmState, err := client.GetHelmState(ctx, p.Namespace, p.HelmValuesSecretName)
func (k *K8sHubble) generateDefaultHelmState(ctx context.Context, client k8sHubbleImplementation, namespace string) (*helm.State, error) {
version, err := client.GetRunningCiliumVersion(context.Background(), namespace)
if version == "" || err != nil {
return nil, fmt.Errorf("unable to obtain cilium version, no cilium pods found in namespace %q", namespace)
}
semVer, err := utils.ParseCiliumVersion(version)
if err != nil {
return nil, err
return nil, fmt.Errorf("unable to parse cilium version %s: %w", version, err)
}
return &K8sHubble{
k.Log("🔮 Auto-detected cilium version %s", version)
return &helm.State{
Secret: nil,
Version: semVer,
Values: chartutil.Values{},
}, nil
}

func NewK8sHubble(ctx context.Context, client k8sHubbleImplementation, p Parameters) (*K8sHubble, error) {
cm := certs.NewCertManager(client, certs.Parameters{Namespace: p.Namespace})
k := K8sHubble{
client: client,
params: p,
certManager: cm,
helmState: helmState,
}, nil
}
helmState, err := client.GetHelmState(ctx, p.Namespace, p.HelmValuesSecretName)
if err != nil {
// if cilium-cli-helm-values secret was not found (e.g. cilium was not installed with cilium-cli)
// or the secret parsing failed for whatever reason, then we create a default helm state.
k.Log("⚠️ Error parsing helm cli secret: %s", err)
k.Log("⚠️ Proceed in unknown install state")
helmState, err = k.generateDefaultHelmState(ctx, client, p.Namespace)
if err != nil {
return nil, err
}
}
k.helmState = helmState
return &k, nil
}

func (k *K8sHubble) Log(format string, a ...interface{}) {
Expand Down Expand Up @@ -275,16 +306,11 @@ func (k *K8sHubble) disableHubble(ctx context.Context) error {
}

func (k *K8sHubble) Disable(ctx context.Context) error {
helmState, err := k.client.GetHelmState(ctx, k.params.Namespace, k.params.HelmValuesSecretName)
if err != nil {
return err
}

// Generate the manifests has if hubble was being enabled so that we can
// retrieve all UI and Relay's resource names.
k.params.UI = true
k.params.Relay = true
err = k.generateManifestsEnable(ctx, false, helmState.Values)
err := k.generateManifestsEnable(ctx, false, k.helmState.Values)
if err != nil {
return err
}
Expand All @@ -309,7 +335,7 @@ func (k *K8sHubble) Disable(ctx context.Context) error {

// Now that we have delete all UI and Relay's resource names then we can
// generate the manifests with UI and Relay disabled.
err = k.generateManifestsDisable(ctx, helmState.Values)
err = k.generateManifestsDisable(ctx, k.helmState.Values)
if err != nil {
return err
}
Expand All @@ -318,12 +344,15 @@ func (k *K8sHubble) Disable(ctx context.Context) error {
return err
}

k.Log("ℹ️ Storing helm values file in %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)
// If helm values secret is not present we should not write one to the cluster now
if k.helmState.Secret != nil {
k.Log("ℹ️ Storing helm values file in %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)

helmState.Secret.Data[defaults.HelmValuesSecretKeyName] = []byte(k.helmYAMLValues)
if _, err := k.client.UpdateSecret(ctx, k.params.Namespace, helmState.Secret, metav1.UpdateOptions{}); err != nil {
k.Log("❌ Unable to store helm values file %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)
return err
k.helmState.Secret.Data[defaults.HelmValuesSecretKeyName] = []byte(k.helmYAMLValues)
if _, err := k.client.UpdateSecret(ctx, k.params.Namespace, k.helmState.Secret, metav1.UpdateOptions{}); err != nil {
k.Log("❌ Unable to store helm values file %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)
return err
}
}

k.Log("✅ Hubble was successfully disabled.")
Expand Down Expand Up @@ -359,13 +388,80 @@ func (k *K8sHubble) enableHubble(ctx context.Context) error {
return k.updateConfigMap(ctx)
}

func contains(s []string, str string) bool {
for _, v := range s {
if v == str {
return true
}
}
return false
}

// Removes any values that are not related to hubble from configmap patch
func (k *K8sHubble) filterConfigmapPatch(patch []byte) ([]byte, error) {
patchYaml := map[string]interface{}{}
err := json.Unmarshal(patch, &patchYaml)
if err != nil {
return nil, err
}

hubbleOnlyFields := map[string]interface{}{}
data := reflect.ValueOf(patchYaml["data"])
if data.Kind() == reflect.Map {
for _, key := range data.MapKeys() {
keyStr := key.Interface().(string)
if contains(defaults.HubbleKeys, keyStr) {
if data.MapIndex(key).Interface() == nil {
hubbleOnlyFields[keyStr] = nil
} else {
hubbleOnlyFields[keyStr] = data.MapIndex(key).Interface().(string)
}
}
}
} else {
return nil, fmt.Errorf("Unable to decode patch data %v", patchYaml)
}
patchYaml["data"] = hubbleOnlyFields
newPatch, err := json.Marshal(patchYaml)
if err != nil {
return nil, err
}
return newPatch, nil
}

func (k *K8sHubble) updateConfigMap(ctx context.Context) error {
oldCm, 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)
}

cm, err := k.generateConfigMap()
if err != nil {
return err
}
oldData, err := json.Marshal(oldCm)
if err != nil {
return err
}
newData, err := json.Marshal(cm)
if err != nil {
return err
}
patch, err := jsonpatch.CreateMergePatch(oldData, newData)
if err != nil {
return err
}

// if helm state secret doesn't exist, we need to make sure to apply only
// hubble values so that we don't overwrite any settings with default values.
if k.helmState.Secret == nil {
patch, err = k.filterConfigmapPatch(patch)
if err != nil {
return err
}
}

_, err = k.client.UpdateConfigMap(ctx, cm, metav1.UpdateOptions{})
_, err = k.client.PatchConfigMap(ctx, k.params.Namespace, defaults.ConfigMapName, types.StrategicMergePatchType, patch, metav1.PatchOptions{})
if err != nil {
return fmt.Errorf("unable to patch ConfigMap %s with %s: %w", defaults.ConfigMapName, cm, err)
}
Expand Down Expand Up @@ -515,12 +611,7 @@ func (k *K8sHubble) Enable(ctx context.Context) error {
}
}

helmState, err := k.client.GetHelmState(ctx, k.params.Namespace, k.params.HelmValuesSecretName)
if err != nil {
return err
}

err = k.generateManifestsEnable(ctx, true, helmState.Values)
err = k.generateManifestsEnable(ctx, true, k.helmState.Values)
if err != nil {
return err
}
Expand Down Expand Up @@ -603,12 +694,15 @@ func (k *K8sHubble) Enable(ctx context.Context) error {
}
}

k.Log("ℹ️ Storing helm values file in %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)
// If helm values secret is not present we should not write one to the cluster now
if k.helmState.Secret != nil {
k.Log("ℹ️ Storing helm values file in %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)

helmState.Secret.Data[defaults.HelmValuesSecretKeyName] = []byte(k.helmYAMLValues)
if _, err := k.client.UpdateSecret(ctx, k.params.Namespace, helmState.Secret, metav1.UpdateOptions{}); err != nil {
k.Log("❌ Unable to store helm values file %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)
return err
k.helmState.Secret.Data[defaults.HelmValuesSecretKeyName] = []byte(k.helmYAMLValues)
if _, err := k.client.UpdateSecret(ctx, k.params.Namespace, k.helmState.Secret, metav1.UpdateOptions{}); err != nil {
k.Log("❌ Unable to store helm values file %s/%s Secret", k.params.Namespace, k.params.HelmValuesSecretName)
return err
}
}

k.Log("✅ Hubble was successfully enabled!")
Expand Down

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