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Kubesphere Openkruise Agent Skill

by kubesphere

KubeSphere OpenKruise management Skill. Use when user asks to install or enable OpenKruise, check OpenKruise status, view kruise pods/logs/CRDs, create or update SidecarSet, manage sidecar injection, create or update CloneSet, perform in-place update or batch rollout, uninstall or remove OpenKruise, or troubleshoot Kruise Pod, CRD, and webhook issues in KubeSphere.

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Install

one command, takes just this skill from the repository 
npx skills add https://github.com/kubesphere/kubesphere --skill kubesphere-openkruise

The instruction itself

34 sections, as written by the author

Skill: kubesphere-openkruise

KubeSphere OpenKruise Management

Use this skill for the full OpenKruise lifecycle in KubeSphere:

  • Install or upgrade the OpenKruise extension through InstallPlan
  • Query extension status, CRDs, Pods, and logs
  • Generate SidecarSet manifests for sidecar injection and rolling updates
  • Generate CloneSet manifests for advanced stateless workloads, in-place updates, and batch rollout
  • Uninstall the OpenKruise extension
  • Troubleshoot failed Pods, missing CRDs, and webhook problems

Out of scope by default:

  • Advanced OpenKruise CRDs not requested by the user, such as BroadcastJob, NodeImage, UnitedDeployment, or AdvancedPodAutoscaler
  • Deep chart-value design without cluster evidence

If the user explicitly asks for those CRDs, acknowledge that they are OpenKruise capabilities but treat them as a follow-up task instead of assuming they belong in the default workflow.

Response Rules

  • Prefer executable output: InstallPlan YAML, SidecarSet YAML, CloneSet YAML, kubectl commands, or a short ordered procedure.
  • Verify the extension name and exact version before generating a final InstallPlan.
  • Default the extension name to openkruise only if the user context or cluster output does not expose a different resource name.
  • In this KubeSphere environment, the observed mapping is:
  • KubeSphere extension version 1.0.3
  • OpenKruise runtime version 1.4.0
  • Distinguish two version concepts before generating InstallPlan:
  • KubeSphere extension version: used by spec.extension.version
  • OpenKruise runtime version: the controller or component version seen in Pods or docs
  • For this environment, if the user asks to install the current OpenKruise plugin and does not provide another extension version, prefer spec.extension.version: 1.0.3.
  • If the user only provides the OpenKruise runtime version, first ask them to confirm the matching KubeSphere extension version.
  • Never invent a version. If the version is missing, first show how to list versions and ask the user to confirm one.
  • InstallPlan.metadata.name MUST equal InstallPlan.spec.extension.name.
  • InstallPlan is cluster-scoped in KubeSphere. Do not add a namespace to kubectl get|describe|delete installplan.
  • Use upgradeStrategy: Manual unless the user explicitly asks for something else.
  • Omit optional fields instead of guessing values.
  • Before generating SidecarSet or CloneSet, prefer checking the installed API versions:
kubectl api-resources --api-group apps.kruise.io
  • If the cluster version is unknown and the user only wants an example, prefer:
  • SidecarSet: apps.kruise.io/v1alpha1
  • CloneSet: apps.kruise.io/v1alpha1
  • For uninstall requests, warn that deleting CRDs or CR instances can remove application configuration. Do not suggest deleting CRDs unless the user explicitly asks for full cleanup.

Version Mapping Discovery

Treat the 1.0.3 -> 1.4.0 mapping as environment evidence, not a universal rule. When the user asks for precision, prove it first:

# Discover KubeSphere extension version
kubectl get extensionversions.kubesphere.io -l kubesphere.io/extension-ref=openkruise
kubectl get extensionversion openkruise-1.0.3 -o yaml

# Discover deployed runtime image or controller version
kubectl get pods -n kruise-system -o wide
kubectl get deploy -n kruise-system kruise-manager -o jsonpath='{.spec.template.spec.containers[*].image}'
kubectl describe pod -n kruise-system <kruise-manager-pod>

If these commands disagree with the assumed mapping, prefer cluster output over the baked-in default.

Discovery Commands

This section provides two approaches for querying OpenKruise status:

  • KubeSphere API (curl) - for extension management and multi-cluster queries
  • kubectl - for direct Kubernetes resource operations

Option 1: Using KubeSphere API (curl)

Use curl with environment variables for querying KubeSphere extension status and multi-cluster resources.

Environment Variables:

export KS_HOST="http://<kubesphere-host>"     # KubeSphere console URL (required)
export KS_USERNAME="admin"                     # Username (default: admin)
export KS_PASSWORD="<password>"                # Password (required)

Helper Functions (add to ~/.bashrc or use directly):

# Get OAuth token
ks_token() {
  curl -s -X POST "$KS_HOST/oauth/token" \
    -H "Content-Type: application/x-www-form-urlencoded" \
    -d "grant_type=password&username=${KS_USERNAME:-admin}&password=$KS_PASSWORD&client_id=kubesphere&client_secret=kubesphere" | jq -r '.access_token'
}

# Make API call: ks_api GET/POST/PUT/DELETE <path> [body]
ks_api() {
  local method=${1:-GET}
  local path=$2
  local body=$3
  local token=$(ks_token)
  
  curl -s -X "$method" \
    -H "Authorization: Bearer $token" \
    -H "Content-Type: application/json" \
    ${body:+-d "$body"} \
    "$KS_HOST$path"
}

Query Commands:

# List all clusters (host + member clusters)
ks_api GET /kapis/cluster.kubesphere.io/v1alpha1/clusters | jq -r '.items[].metadata.name'

# List installed extensions
ks_api GET /kapis/kubesphere.io/v1alpha1/extensions | jq -r '.items[].metadata.name' | grep -i kruise

# List available extension versions
ks_api GET /kapis/kubesphere.io/v1alpha1/extensionversions | jq -r '.items[].metadata.name' | grep -i kruise

# Get OpenKruise extension details
ks_api GET /kapis/kubesphere.io/v1alpha1/extensions/openkruise | jq

# Get cluster connection status (for member clusters)
ks_api GET /kapis/cluster.kubesphere.io/v1alpha1/clusters/member-4/status | jq '.conditions'

Multi-Cluster Resource Query (host cluster)

# Get pods in host cluster
ks_api GET /clusters/host/api/v1/namespaces/kruise-system/pods | jq -r '.items[].metadata.name'

# Get SidecarSets in host cluster (cluster-wide)
ks_api GET /clusters/host/kapis/apps.kruise.io/v1alpha1/users/admin/sidecarsets | jq -r '.items[].metadata.name'

# Get CloneSets in host cluster (cluster-wide)
ks_api GET /clusters/host/kapis/apps.kruise.io/v1alpha1/users/admin/clonesets | jq -r '.items[].metadata.name'

# Get SidecarSets in specific namespace
ks_api GET /clusters/host/kapis/apps.kruise.io/v1alpha1/namespaces/default/sidecarsets | jq -r '.items[].metadata.name'

# Get namespaces where a SidecarSet is applied
ks_api GET /clusters/host/kapis/apps.kruise.io/v1alpha1/users/admin/sidecarsetname/side1 | jq -r '.items[].metadata.name'

# Get specific SidecarSet details
ks_api GET /clusters/host/kapis/apps.kruise.io/v1alpha1/users/admin/sidecarsets/side1 | jq

# Get CRDs in host cluster
ks_api GET /clusters/host/apis/apiextensions.k8s.io/v1/customresourcedefinitions | jq -r '.items[] | select(.metadata.name | contains("kruise")) | .metadata.name'

Multi-Cluster Resource Query (member cluster)

# Get pods in member cluster
ks_api GET /clusters/member-4/api/v1/namespaces/kruise-system/pods | jq -r '.items[].metadata.name'

# Get SidecarSets in member cluster (cluster-wide)
ks_api GET /clusters/member-4/kapis/apps.kruise.io/v1alpha1/users/admin/sidecarsets | jq -r '.items[].metadata.name'

# Get CloneSets in member cluster (cluster-wide)
ks_api GET /clusters/member-4/kapis/apps.kruise.io/v1alpha1/users/admin/clonesets | jq -r '.items[].metadata.name'

# Get CRDs in member cluster
ks_api GET /clusters/member-4/apis/apiextensions.k8s.io/v1/customresourcedefinitions | jq -r '.items[] | select(.metadata.name | contains("kruise")) | .metadata.name'

API Path Format:

# For KubeSphere extension management:
/kapis/kubesphere.io/v1alpha1/extensions
/kapis/cluster.kubesphere.io/v1alpha1/clusters

# For cluster-wide OpenKruise resources (SidecarSet, CloneSet):
/clusters/{cluster}/kapis/apps.kruise.io/v1alpha1/users/admin/{resources}
/clusters/{cluster}/kapis/apps.kruise.io/v1alpha1/users/admin/{resources}/{name}
/clusters/{cluster}/kapis/apps.kruise.io/v1alpha1/users/admin/sidecarsetname/{sidecarsetName}

/clusters/{cluster}/api/v1/namespaces/{namespace}/{resources}
/clusters/{cluster}/apis/apiextensions.k8s.io/v1/customresourcedefinitions

Query Parameters:

  • page - Page number (default: 1)
  • limit - Items per page
  • ascending - Sort direction (default: false)
  • sortBy - Sort field (e.g., createTime)

Option 2: Using kubectl (Direct Cluster Access)

Use kubectl for direct Kubernetes resource operations on the host cluster.

# Extension and version discovery in KubeSphere
kubectl get extensions.kubesphere.io | grep -i kruise
kubectl get extensionversions.kubesphere.io | grep -i kruise
kubectl get extensionversions.kubesphere.io -l kubesphere.io/extension-ref=openkruise

# InstallPlan and extension status
kubectl get installplans.kubesphere.io
kubectl get installplan openkruise -o yaml
kubectl describe extension openkruise
kubectl describe extensionversion openkruise-<version>

# OpenKruise runtime resources
kubectl api-resources --api-group apps.kruise.io
kubectl get crd | grep -E 'clonesets.apps.kruise.io|sidecarsets.apps.kruise.io'
kubectl get pods -A | grep -i kruise
kubectl get sidecarsets.apps.kruise.io -A
kubectl get clonesets.apps.kruise.io -A

Option 3: Multi-Cluster Query (kubeconfig extraction)

For querying member clusters, extract the kubeconfig from the Cluster resource:

# Get kubeconfig for a member cluster
CLUSTER_NAME=member-4
KUBECONFIG_ENCODED=$(kubectl get cluster.cluster.kubesphere.io $CLUSTER_NAME -o jsonpath='{.spec.connection.kubeconfig}')
echo "$KUBECONFIG_ENCODED" | base64 -d > /tmp/${CLUSTER_NAME}-kubeconfig

# Query member cluster
export KUBECONFIG=/tmp/${CLUSTER_NAME}-kubeconfig
kubectl get pods -n kruise-system
kubectl get sidecarsets.apps.kruise.io -A
kubectl get clonesets.apps.kruise.io -A

# Switch back to host cluster
export KUBECONFIG=""

When to Use Which Approach

| Scenario | Recommended Approach |

|----------|---------------------|

| Query KubeSphere extension status | KubeSphere API (curl) |

| List available clusters | KubeSphere API (curl) |

| Query host cluster Kubernetes resources | kubectl |

| Query member cluster Kubernetes resources | kubeconfig extraction |

| Create/apply InstallPlan/SidecarSet/CloneSet | kubectl |

| Get extension version info | KubeSphere API (curl) |

Install OpenKruise in KubeSphere

1. Pre-check

kubectl get extension openkruise
kubectl get extensionversions.kubesphere.io -l kubesphere.io/extension-ref=openkruise
kubectl describe extensionversion openkruise-<exact-version>

Check:

  • The extension resource really exists
  • The exact extension version exists
  • Whether the extension is single-cluster or multi-cluster
  • Whether the user needs custom config
  • Whether the user is giving an extension version or only the OpenKruise runtime version
  • In this environment, remember that extension 1.0.3 maps to OpenKruise runtime 1.4.0

2. InstallPlan Template

Use this when the user has already confirmed the extension name and version.

Note:

  • InstallPlan is a KubeSphere CRD resource, created and managed only in the host cluster (not in member clusters)
  • clusterScheduling.placement.clusters specifies which clusters the extension agent components should be installed to (host, member-4, etc.)
apiVersion: kubesphere.io/v1alpha1
kind: InstallPlan
metadata:
  name: openkruise
spec:
  enabled: true
  extension:
    name: openkruise
    version: <exact-version>
  upgradeStrategy: Manual
  # config: |
  #   featureGates: "PreDownloadImageForInPlaceUpdate=true"
  clusterScheduling:
    placement:
      clusters:
      - host
      - member-4
    # overrides:
    #   host: |-
    #     featureGates: "PreDownloadImageForInPlaceUpdate=true"

Fields:

  • clusterScheduling.placement.clusters: List of clusters to install the extension agent (e.g., host, member-4). The OpenKruise agent will be deployed to these clusters.
  • clusterScheduling.overrides: Cluster-specific config overrides (optional)

Apply and verify:

kubectl apply -f installplan-openkruise.yaml
kubectl get installplan openkruise -w
kubectl describe installplan openkruise
kubectl get extension openkruise -o yaml

Check installation status per cluster:

kubectl get installplan openkruise -o jsonpath='{.status.clusterSchedulingStatuses}'

2.1 Config Handling

spec.config is a YAML string block, not a nested object. Only include it when the user asks for non-default settings.

spec:
  config: |
    featureGates: "PreDownloadImageForInPlaceUpdate=true"

Rules:

  • The content under config: | must itself be valid YAML
  • Do not invent config keys without evidence from chart values, extension documentation, or user-provided requirements
  • If config keys are unknown, prefer default install and show discovery commands first

Useful discovery commands:

kubectl describe extensionversion openkruise-<extension-version>
kubectl get extensionversion openkruise-<extension-version> -o yaml

3. Status and Logs After Install

TARGET_NS=$(kubectl get installplan openkruise -o jsonpath='{.status.targetNamespace}')
JOB_NAME=$(kubectl get installplan openkruise -o jsonpath='{.status.jobName}')

kubectl get pods -n "${TARGET_NS:-kruise-system}"
kubectl logs -n "${TARGET_NS:-kruise-system}" -l job-name="$JOB_NAME" --tail=200
kubectl logs -n "${TARGET_NS:-kruise-system}" deploy/kruise-manager --tail=200
kubectl get crd | grep -E 'clonesets.apps.kruise.io|sidecarsets.apps.kruise.io'

Manage SidecarSet

Use SidecarSet when the user wants cluster-level sidecar injection and separate lifecycle management for sidecars.

SidecarSet Template

apiVersion: apps.kruise.io/v1alpha1
kind: SidecarSet
metadata:
  name: log-agent
spec:
  selector:
    matchLabels:
      app: demo
  namespaceSelector:
    matchLabels:
      kubernetes.io/metadata.name: demo-project
  containers:
  - name: log-agent
    image: fluent/fluent-bit:2.2
    imagePullPolicy: IfNotPresent
    env:
    - name: LOG_LEVEL
      value: info
    volumeMounts:
    - name: varlog
      mountPath: /var/log
    podInjectPolicy: BeforeAppContainer
  volumes:
  - name: varlog
    hostPath:
      path: /var/log
  updateStrategy:
    type: RollingUpdate
    maxUnavailable: 1

Common operations:

kubectl apply -f sidecarset.yaml
kubectl get sidecarset log-agent -o yaml
kubectl describe sidecarset log-agent
kubectl delete sidecarset log-agent

Verify injection:

kubectl get pods -n demo-project -l app=demo
kubectl get pod <pod-name> -n demo-project -o jsonpath='{.spec.containers[*].name}'
kubectl describe pod <pod-name> -n demo-project

SidecarSet troubleshooting checks:

  • spec.selector matches the workload Pod labels
  • namespaceSelector matches the target namespace labels
  • The sidecar image can be pulled in target namespaces
  • kruise-manager webhook is healthy

Manage CloneSet

Use CloneSet when the user wants an enhanced workload with in-place image updates, batch rollout, or richer update controls than Deployment.

CloneSet Template

apiVersion: apps.kruise.io/v1alpha1
kind: CloneSet
metadata:
  name: sample-app
  namespace: demo-project
spec:
  replicas: 3
  selector:
    matchLabels:
      app: sample-app
  template:
    metadata:
      labels:
        app: sample-app
    spec:
      containers:
      - name: app
        image: nginx:1.25
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
  updateStrategy:
    type: InPlaceIfPossible
    partition: 0%
    maxUnavailable: 1

Common operations:

kubectl apply -f cloneset.yaml
kubectl get cloneset sample-app -n demo-project
kubectl describe cloneset sample-app -n demo-project
kubectl delete cloneset sample-app -n demo-project

Verify rollout state:

kubectl get pods -n demo-project -l app=sample-app -o wide
kubectl get events -n demo-project --sort-by=.lastTimestamp

In-place Update Guidance

When the user asks for "in-place update" or an in-place image update:

  • Keep spec.updateStrategy.type: InPlaceIfPossible
  • Change the container image in spec.template.spec.containers
  • Re-apply the manifest
kubectl get cloneset sample-app -n demo-project -o yaml > cloneset.yaml
# edit image and, if needed, updateStrategy.partition
kubectl apply -f cloneset.yaml
kubectl describe cloneset sample-app -n demo-project
kubectl get pods -n demo-project -l app=sample-app -o wide

Batch Rollout Guidance

Use partition to keep part of the Pods on the old revision during a rollout.

  • partition: 100% means keep all replicas on the old revision
  • partition: 50% means only half of the replicas move to the new revision
  • partition: 0% means finish the rollout

Example rollout sequence:

  • Change image to the new version and set partition: 100%
  • Lower to partition: 50%
  • Lower to partition: 0%

At each step, verify Pod revision movement:

kubectl get cloneset sample-app -n demo-project -o yaml
kubectl get pods -n demo-project -l app=sample-app -o wide

CloneSet Troubleshooting Checks

  • If Pods are recreated instead of in-place updated, confirm updateStrategy.type is InPlaceIfPossible or InPlaceOnly
  • Some field changes still require Pod recreation
  • If CPU and memory are changed together with image updates in unsupported environments, split the change into separate steps
  • Check the controller and workload events with:
kubectl describe cloneset sample-app -n demo-project
kubectl get pods -n demo-project -l app=sample-app -o wide
kubectl get events -n demo-project --sort-by=.lastTimestamp

Uninstall OpenKruise

Uninstall Pre-check

Check whether workloads still depend on OpenKruise resources before uninstalling the extension:

kubectl get sidecarsets.apps.kruise.io -A
kubectl get clonesets.apps.kruise.io -A

If these resources still exist, tell the user to migrate or remove them first.

Default uninstall path:

kubectl delete installplan openkruise
kubectl get installplan openkruise
kubectl get pods -n kruise-system | grep -i kruise

If the user wants full cleanup, remind them to handle application resources first:

  • Delete or migrate SidecarSet and CloneSet resources that are still in use
  • Confirm whether application teams still depend on OpenKruise behavior
  • Only discuss CRD removal after the user explicitly confirms full cleanup

Troubleshooting Playbook

1. InstallPlan or extension failed

kubectl describe installplan openkruise
kubectl get installplan openkruise -o jsonpath='{.status.conditions}'
kubectl get extension openkruise -o yaml
kubectl get extensionversion openkruise-<version> -o yaml

2. Kruise Pods are unhealthy

kubectl get pods -A | grep -i kruise
kubectl describe pod -n kruise-system <pod-name>
kubectl logs -n kruise-system deploy/kruise-manager --tail=200
kubectl get events -n kruise-system --sort-by=.lastTimestamp

3. CRD missing or not established

kubectl get crd clonesets.apps.kruise.io sidecarsets.apps.kruise.io
kubectl describe crd clonesets.apps.kruise.io
kubectl describe crd sidecarsets.apps.kruise.io
kubectl api-resources --api-group apps.kruise.io

Likely causes:

  • OpenKruise extension installation did not finish
  • CRDs were partially created or rejected by the API server
  • Webhook or controller startup failed before CRDs became usable

Safe next actions:

  • Re-check InstallPlan state and conditions
  • Inspect install Job logs and kruise-manager logs
  • Avoid creating workload CRs until the CRDs are established

4. Webhook failure

kubectl get mutatingwebhookconfigurations,validatingwebhookconfigurations | grep -i kruise
kubectl describe mutatingwebhookconfiguration | grep -i -A5 kruise
kubectl describe validatingwebhookconfiguration | grep -i -A5 kruise
kubectl logs -n kruise-system deploy/kruise-manager --tail=200

Likely causes:

  • kruise-manager Pod is not Ready
  • Webhook service endpoints are missing
  • TLS certificate has expired or does not match the service DNS name
  • The API server cannot reach the webhook service
  • The target Pod or namespace does not match SidecarSet selectors

Safe next actions:

  • Check kruise-manager Pod readiness and recent restarts
  • Check Service and Endpoints for the webhook target
  • Inspect recent TLS or x509 errors in controller logs
  • Verify the target namespace labels and Pod labels match the SidecarSet

5. Sidecar not injected

kubectl get sidecarset -A
kubectl get sidecarset <name> -o yaml
kubectl get pod <pod-name> -n <namespace> -o yaml
kubectl get namespace <namespace> --show-labels

6. CloneSet rollout stuck

kubectl describe cloneset <name> -n <namespace>
kubectl get pods -n <namespace> -l app=<label> -o wide
kubectl get events -n <namespace> --sort-by=.lastTimestamp

Output Patterns

Match the answer to the user intent:

  • Install request: brief pre-check commands plus a complete InstallPlan manifest
  • Status request: only the most relevant kubectl commands, grouped by purpose
  • SidecarSet request: one executable manifest plus apply, verify, and delete commands
  • CloneSet request: one executable manifest plus rollout guidance for in-place update or partition-based rollout
  • Uninstall request: delete command, verification commands, and cleanup cautions
  • Troubleshooting request: diagnosis commands first, then likely causes, then safe next steps

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