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k8s-manifests

Create, validate, and manage Kubernetes and OpenShift YAML manifests. Use this skill when: (1) Creating any K8s/OCP resources: Deployments, StatefulSets, DaemonSets, Jobs, CronJobs, Pods (2) Creating networking resources: Services, Ingress, NetworkPolicies, OCP Routes (3) Creating config/storage: ConfigMaps, Secrets, PVCs, PVs, StorageClasses (4) Creating RBAC: ServiceAccounts, Roles, RoleBindings, ClusterRoles, ClusterRoleBindings (5) Creating OCP-specific: DeploymentConfigs, BuildConfigs, ImageStreams, SCCs, Templates (6) Validating or reviewing existing manifests for best practices (7) Converting between K8s and OCP resource types (8) Generating Helm charts or Kustomize overlays

$ Installer

git clone https://github.com/kcns008/cluster-code /tmp/cluster-code && cp -r /tmp/cluster-code/.claude/skills/k8s-manifests ~/.claude/skills/cluster-code

// tip: Run this command in your terminal to install the skill

SKILL.md
View on GitHub →

name: k8s-manifests description: | Create, validate, and manage Kubernetes and OpenShift YAML manifests. Use this skill when: (1) Creating any K8s/OCP resources: Deployments, StatefulSets, DaemonSets, Jobs, CronJobs, Pods (2) Creating networking resources: Services, Ingress, NetworkPolicies, OCP Routes (3) Creating config/storage: ConfigMaps, Secrets, PVCs, PVs, StorageClasses (4) Creating RBAC: ServiceAccounts, Roles, RoleBindings, ClusterRoles, ClusterRoleBindings (5) Creating OCP-specific: DeploymentConfigs, BuildConfigs, ImageStreams, SCCs, Templates (6) Validating or reviewing existing manifests for best practices (7) Converting between K8s and OCP resource types (8) Generating Helm charts or Kustomize overlays

Kubernetes / OpenShift Manifest Generator

Command Usage Convention

IMPORTANT: This skill uses kubectl as the primary command in all examples. When working with:

  • OpenShift/ARO clusters: Replace all kubectl commands with oc
  • Standard Kubernetes clusters (AKS, EKS, GKE, etc.): Use kubectl as shown

The agent will automatically detect the cluster type and use the appropriate command.

Generate production-ready YAML manifests following security best practices and operational excellence.

Core Principles

  1. Security by Default: Always include security contexts, never run as root unless explicitly required
  2. Resource Management: Always specify resource requests/limits
  3. High Availability: Default to multiple replicas with anti-affinity for production
  4. Observability: Include health probes, annotations for monitoring
  5. GitOps Ready: Generate manifests suitable for version control and GitOps workflows

Manifest Generation Workflow

  1. Identify resource type and target platform (K8s vanilla, OCP, EKS, GKE, AKS)
  2. Gather requirements (replicas, resources, networking, storage)
  3. Apply security best practices
  4. Generate YAML with appropriate labels and annotations
  5. Validate against best practices checklist

Resource Templates

Deployment (Production-Ready)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/instance: ${INSTANCE}
    app.kubernetes.io/version: "${VERSION}"
    app.kubernetes.io/component: ${COMPONENT}
    app.kubernetes.io/part-of: ${PART_OF}
    app.kubernetes.io/managed-by: cluster-code
  annotations:
    description: "${DESCRIPTION}"
spec:
  replicas: ${REPLICAS:-3}
  revisionHistoryLimit: 5
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  selector:
    matchLabels:
      app.kubernetes.io/name: ${APP_NAME}
      app.kubernetes.io/instance: ${INSTANCE}
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ${APP_NAME}
        app.kubernetes.io/instance: ${INSTANCE}
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "${METRICS_PORT:-8080}"
        prometheus.io/path: "/metrics"
    spec:
      serviceAccountName: ${SERVICE_ACCOUNT:-default}
      securityContext:
        runAsNonRoot: true
        runAsUser: 1000
        runAsGroup: 1000
        fsGroup: 1000
        seccompProfile:
          type: RuntimeDefault
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - weight: 100
              podAffinityTerm:
                labelSelector:
                  matchLabels:
                    app.kubernetes.io/name: ${APP_NAME}
                topologyKey: kubernetes.io/hostname
      topologySpreadConstraints:
        - maxSkew: 1
          topologyKey: topology.kubernetes.io/zone
          whenUnsatisfiable: ScheduleAnyway
          labelSelector:
            matchLabels:
              app.kubernetes.io/name: ${APP_NAME}
      containers:
        - name: ${APP_NAME}
          image: ${IMAGE}:${TAG}
          imagePullPolicy: IfNotPresent
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop:
                - ALL
          ports:
            - name: http
              containerPort: ${PORT:-8080}
              protocol: TCP
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          envFrom:
            - configMapRef:
                name: ${APP_NAME}-config
                optional: true
            - secretRef:
                name: ${APP_NAME}-secrets
                optional: true
          resources:
            requests:
              cpu: ${CPU_REQUEST:-100m}
              memory: ${MEMORY_REQUEST:-128Mi}
            limits:
              cpu: ${CPU_LIMIT:-500m}
              memory: ${MEMORY_LIMIT:-512Mi}
          livenessProbe:
            httpGet:
              path: /healthz
              port: http
            initialDelaySeconds: 15
            periodSeconds: 10
            timeoutSeconds: 5
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /ready
              port: http
            initialDelaySeconds: 5
            periodSeconds: 5
            timeoutSeconds: 3
            failureThreshold: 3
          startupProbe:
            httpGet:
              path: /healthz
              port: http
            initialDelaySeconds: 10
            periodSeconds: 5
            failureThreshold: 30
          volumeMounts:
            - name: tmp
              mountPath: /tmp
            - name: cache
              mountPath: /var/cache
      volumes:
        - name: tmp
          emptyDir: {}
        - name: cache
          emptyDir: {}
      terminationGracePeriodSeconds: 30

Service

apiVersion: v1
kind: Service
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  type: ${SERVICE_TYPE:-ClusterIP}
  ports:
    - name: http
      port: ${SERVICE_PORT:-80}
      targetPort: http
      protocol: TCP
  selector:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/instance: ${INSTANCE}

Ingress (K8s)

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
    nginx.ingress.kubernetes.io/proxy-body-size: "10m"
    cert-manager.io/cluster-issuer: ${CLUSTER_ISSUER:-letsencrypt-prod}
spec:
  ingressClassName: ${INGRESS_CLASS:-nginx}
  tls:
    - hosts:
        - ${HOST}
      secretName: ${APP_NAME}-tls
  rules:
    - host: ${HOST}
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: ${APP_NAME}
                port:
                  name: http

OpenShift Route

apiVersion: route.openshift.io/v1
kind: Route
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
  annotations:
    haproxy.router.openshift.io/timeout: 60s
spec:
  host: ${HOST}
  to:
    kind: Service
    name: ${APP_NAME}
    weight: 100
  port:
    targetPort: http
  tls:
    termination: edge
    insecureEdgeTerminationPolicy: Redirect
  wildcardPolicy: None

ConfigMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: ${APP_NAME}-config
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
data:
  # Application configuration
  APP_ENV: "${ENVIRONMENT:-production}"
  LOG_LEVEL: "${LOG_LEVEL:-info}"
  # Add application-specific config here

Secret (Template - values should be base64 encoded or use stringData)

apiVersion: v1
kind: Secret
metadata:
  name: ${APP_NAME}-secrets
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
type: Opaque
stringData:
  # Use stringData for plain text (auto-encoded)
  # Use data: for pre-encoded base64 values
  DATABASE_URL: "${DATABASE_URL}"

PersistentVolumeClaim

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ${APP_NAME}-data
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  accessModes:
    - ${ACCESS_MODE:-ReadWriteOnce}
  storageClassName: ${STORAGE_CLASS:-standard}
  resources:
    requests:
      storage: ${STORAGE_SIZE:-10Gi}

StatefulSet

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  serviceName: ${APP_NAME}-headless
  replicas: ${REPLICAS:-3}
  podManagementPolicy: Parallel
  updateStrategy:
    type: RollingUpdate
  selector:
    matchLabels:
      app.kubernetes.io/name: ${APP_NAME}
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ${APP_NAME}
    spec:
      securityContext:
        runAsNonRoot: true
        runAsUser: 1000
        fsGroup: 1000
        seccompProfile:
          type: RuntimeDefault
      containers:
        - name: ${APP_NAME}
          image: ${IMAGE}:${TAG}
          securityContext:
            allowPrivilegeEscalation: false
            readOnlyRootFilesystem: true
            capabilities:
              drop:
                - ALL
          ports:
            - name: http
              containerPort: ${PORT:-8080}
          resources:
            requests:
              cpu: ${CPU_REQUEST:-100m}
              memory: ${MEMORY_REQUEST:-256Mi}
            limits:
              cpu: ${CPU_LIMIT:-1000m}
              memory: ${MEMORY_LIMIT:-1Gi}
          volumeMounts:
            - name: data
              mountPath: /data
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes:
          - ReadWriteOnce
        storageClassName: ${STORAGE_CLASS:-standard}
        resources:
          requests:
            storage: ${STORAGE_SIZE:-10Gi}

NetworkPolicy

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: ${APP_NAME}-netpol
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: ${APP_NAME}
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: ${INGRESS_NAMESPACE:-ingress-nginx}
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: ${ALLOWED_APP}
      ports:
        - protocol: TCP
          port: ${PORT:-8080}
  egress:
    - to:
        - namespaceSelector: {}
      ports:
        - protocol: UDP
          port: 53
    - to:
        - podSelector:
            matchLabels:
              app.kubernetes.io/name: ${EGRESS_TARGET}
      ports:
        - protocol: TCP
          port: ${EGRESS_PORT}

HorizontalPodAutoscaler

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: ${APP_NAME}
  minReplicas: ${MIN_REPLICAS:-2}
  maxReplicas: ${MAX_REPLICAS:-10}
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: ${CPU_TARGET:-70}
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: ${MEMORY_TARGET:-80}
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
        - type: Percent
          value: 10
          periodSeconds: 60
    scaleUp:
      stabilizationWindowSeconds: 0
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15
        - type: Pods
          value: 4
          periodSeconds: 15
      selectPolicy: Max

ServiceAccount with RBAC

apiVersion: v1
kind: ServiceAccount
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
automountServiceAccountToken: false
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
rules:
  - apiGroups: [""]
    resources: ["configmaps", "secrets"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["get", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: ${APP_NAME}
subjects:
  - kind: ServiceAccount
    name: ${APP_NAME}
    namespace: ${NAMESPACE}

CronJob

apiVersion: batch/v1
kind: CronJob
metadata:
  name: ${JOB_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${JOB_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  schedule: "${SCHEDULE}"
  concurrencyPolicy: ${CONCURRENCY:-Forbid}
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 3
  startingDeadlineSeconds: 300
  jobTemplate:
    spec:
      backoffLimit: 3
      activeDeadlineSeconds: ${TIMEOUT:-3600}
      template:
        spec:
          securityContext:
            runAsNonRoot: true
            runAsUser: 1000
            seccompProfile:
              type: RuntimeDefault
          restartPolicy: OnFailure
          containers:
            - name: ${JOB_NAME}
              image: ${IMAGE}:${TAG}
              securityContext:
                allowPrivilegeEscalation: false
                readOnlyRootFilesystem: true
                capabilities:
                  drop:
                    - ALL
              resources:
                requests:
                  cpu: ${CPU_REQUEST:-100m}
                  memory: ${MEMORY_REQUEST:-128Mi}
                limits:
                  cpu: ${CPU_LIMIT:-500m}
                  memory: ${MEMORY_LIMIT:-512Mi}
              command: ${COMMAND}
              args: ${ARGS}

PodDisruptionBudget

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  minAvailable: ${MIN_AVAILABLE:-1}
  # OR use maxUnavailable: ${MAX_UNAVAILABLE:-1}
  selector:
    matchLabels:
      app.kubernetes.io/name: ${APP_NAME}

OpenShift-Specific Resources

SecurityContextConstraints (Cluster-Admin)

apiVersion: security.openshift.io/v1
kind: SecurityContextConstraints
metadata:
  name: ${SCC_NAME}
  labels:
    app.kubernetes.io/managed-by: cluster-code
allowHostDirVolumePlugin: false
allowHostIPC: false
allowHostNetwork: false
allowHostPID: false
allowHostPorts: false
allowPrivilegeEscalation: false
allowPrivilegedContainer: false
allowedCapabilities: null
defaultAddCapabilities: null
fsGroup:
  type: MustRunAs
  ranges:
    - min: 1000
      max: 65534
priority: null
readOnlyRootFilesystem: true
requiredDropCapabilities:
  - ALL
runAsUser:
  type: MustRunAsRange
  uidRangeMin: 1000
  uidRangeMax: 65534
seLinuxContext:
  type: MustRunAs
supplementalGroups:
  type: MustRunAs
  ranges:
    - min: 1000
      max: 65534
users: []
groups: []
volumes:
  - configMap
  - downwardAPI
  - emptyDir
  - persistentVolumeClaim
  - projected
  - secret

BuildConfig (S2I)

apiVersion: build.openshift.io/v1
kind: BuildConfig
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  source:
    type: Git
    git:
      uri: ${GIT_URI}
      ref: ${GIT_REF:-main}
    contextDir: ${CONTEXT_DIR:-/}
  strategy:
    type: Source
    sourceStrategy:
      from:
        kind: ImageStreamTag
        namespace: openshift
        name: ${BUILDER_IMAGE:-python:3.11-ubi8}
      env:
        - name: APP_ENV
          value: ${ENVIRONMENT:-production}
  output:
    to:
      kind: ImageStreamTag
      name: ${APP_NAME}:latest
  triggers:
    - type: ConfigChange
    - type: ImageChange
    - type: GitHub
      github:
        secret: ${WEBHOOK_SECRET}
  resources:
    limits:
      cpu: "1"
      memory: 2Gi
    requests:
      cpu: 500m
      memory: 1Gi

ImageStream

apiVersion: image.openshift.io/v1
kind: ImageStream
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app.kubernetes.io/name: ${APP_NAME}
    app.kubernetes.io/managed-by: cluster-code
spec:
  lookupPolicy:
    local: true
  tags:
    - name: latest
      annotations:
        description: Latest build of ${APP_NAME}

Best Practices Checklist

Before finalizing any manifest, verify:

Security

  • runAsNonRoot: true in securityContext
  • allowPrivilegeEscalation: false
  • readOnlyRootFilesystem: true (with emptyDir for temp/cache)
  • capabilities.drop: [ALL]
  • seccompProfile.type: RuntimeDefault
  • ServiceAccount with minimal RBAC permissions
  • NetworkPolicy restricting ingress/egress
  • Secrets not hardcoded, using Secret resources or external secrets operator

Reliability

  • Resource requests AND limits defined
  • Liveness, readiness, and startup probes configured
  • PodDisruptionBudget for HA workloads
  • Anti-affinity rules for multi-replica deployments
  • TopologySpreadConstraints for zone distribution

Operations

  • Standard Kubernetes labels (app.kubernetes.io/*)
  • Prometheus annotations for metrics scraping
  • Appropriate terminationGracePeriodSeconds
  • RevisionHistoryLimit set (default 5)
  • RollingUpdate strategy with maxSurge/maxUnavailable

Observability

  • Logging to stdout/stderr
  • Metrics endpoint exposed
  • Health check endpoints (/healthz, /ready)
  • Resource annotations for monitoring dashboards

Common Patterns

Sidecar Container Pattern

Add sidecars for logging, monitoring, or service mesh:

containers:
  - name: app
    # main application
  - name: sidecar
    image: sidecar-image
    resources:
      requests:
        cpu: 10m
        memory: 32Mi
      limits:
        cpu: 50m
        memory: 64Mi

Init Container Pattern

For initialization, migrations, or waiting on dependencies:

initContainers:
  - name: wait-for-db
    image: busybox
    command: ['sh', '-c', 'until nc -z ${DB_HOST} 5432; do sleep 2; done']
  - name: migrations
    image: ${IMAGE}:${TAG}
    command: ['./migrate.sh']

External Secrets Pattern

For HashiCorp Vault, AWS Secrets Manager, etc.:

apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: ${APP_NAME}-secrets
spec:
  refreshInterval: 1h
  secretStoreRef:
    name: vault-backend
    kind: ClusterSecretStore
  target:
    name: ${APP_NAME}-secrets
  data:
    - secretKey: DATABASE_URL
      remoteRef:
        key: ${VAULT_PATH}
        property: database_url

Platform-Specific Notes

EKS (AWS)

  • Use kubernetes.io/aws-load-balancer-* annotations for ALB/NLB
  • IAM Roles for Service Accounts (IRSA) for AWS API access
  • EBS CSI driver for storage

GKE (Google Cloud)

  • Use cloud.google.com/neg for Network Endpoint Groups
  • Workload Identity for GCP API access
  • Compute Engine persistent disk for storage

AKS (Azure)

  • Use kubernetes.io/azure-load-balancer-* annotations
  • AAD Pod Identity or Workload Identity for Azure access
  • Azure Disk/File for storage

OpenShift

  • Use Routes instead of Ingress (or both with ingress controller)
  • DeploymentConfig for S2I builds (or standard Deployment)
  • SCCs for pod security (instead of PodSecurityPolicies/Standards)
  • Image Streams for internal registry management

Repository

kcns008
kcns008
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kcns008/cluster-code/.claude/skills/k8s-manifests
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