k8s-manifests

Generate Kubernetes manifest templates for deployments, services, configmaps, secrets, ingress, and other resources. Use when creating new k8s resources, scaffolding applications, or needing YAML templates. Triggers on requests to create, generate, or scaffold kubernetes resources.

martin-janci 3 Updated 4mo ago

GitHub

Install

npx skillscat add martin-janci/claude-marketplace/k8s-manifests

Install via the SkillsCat registry.

SKILL.md

Kubernetes Manifest Templates

Quick Generation

# Generate deployment YAML
kubectl create deployment myapp --image=nginx --dry-run=client -o yaml > deployment.yaml

# Generate service YAML
kubectl create service clusterip myapp --tcp=80:80 --dry-run=client -o yaml > service.yaml

# Generate configmap from file
kubectl create configmap myconfig --from-file=config.yaml --dry-run=client -o yaml > configmap.yaml

# Generate secret
kubectl create secret generic mysecret --from-literal=password=secret --dry-run=client -o yaml > secret.yaml

Deployment

Standard Deployment

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
  labels:
    app: ${APP_NAME}
spec:
  replicas: ${REPLICAS:-3}
  selector:
    matchLabels:
      app: ${APP_NAME}
  template:
    metadata:
      labels:
        app: ${APP_NAME}
    spec:
      containers:
        - name: ${APP_NAME}
          image: ${IMAGE}:${TAG}
          ports:
            - containerPort: ${PORT:-8080}
          env:
            - name: ENV
              value: "${ENVIRONMENT}"
          envFrom:
            - configMapRef:
                name: ${APP_NAME}-config
            - secretRef:
                name: ${APP_NAME}-secrets
          resources:
            requests:
              cpu: "100m"
              memory: "128Mi"
            limits:
              cpu: "500m"
              memory: "512Mi"
          livenessProbe:
            httpGet:
              path: /healthz
              port: ${PORT:-8080}
            initialDelaySeconds: 15
            periodSeconds: 10
            failureThreshold: 3
          readinessProbe:
            httpGet:
              path: /ready
              port: ${PORT:-8080}
            initialDelaySeconds: 5
            periodSeconds: 5
            failureThreshold: 3
          startupProbe:
            httpGet:
              path: /healthz
              port: ${PORT:-8080}
            failureThreshold: 30
            periodSeconds: 10
      imagePullSecrets:
        - name: regcred

Deployment with Init Container

apiVersion: apps/v1
kind: Deployment
metadata:
  name: ${APP_NAME}
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ${APP_NAME}
  template:
    metadata:
      labels:
        app: ${APP_NAME}
    spec:
      initContainers:
        - name: init-db
          image: busybox:1.36
          command: ['sh', '-c', 'until nc -z ${DB_HOST} 5432; do echo waiting for db; sleep 2; done']
        - name: migrations
          image: ${IMAGE}:${TAG}
          command: ['./migrate', 'up']
          envFrom:
            - secretRef:
                name: ${APP_NAME}-db
      containers:
        - name: ${APP_NAME}
          image: ${IMAGE}:${TAG}
          ports:
            - containerPort: 8080

Services

ClusterIP (internal)

apiVersion: v1
kind: Service
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
spec:
  type: ClusterIP
  selector:
    app: ${APP_NAME}
  ports:
    - name: http
      port: 80
      targetPort: 8080
      protocol: TCP

NodePort (external via node)

apiVersion: v1
kind: Service
metadata:
  name: ${APP_NAME}
spec:
  type: NodePort
  selector:
    app: ${APP_NAME}
  ports:
    - port: 80
      targetPort: 8080
      nodePort: 30080  # 30000-32767

LoadBalancer (cloud provider)

apiVersion: v1
kind: Service
metadata:
  name: ${APP_NAME}
  annotations:
    # AWS
    service.beta.kubernetes.io/aws-load-balancer-type: nlb
    service.beta.kubernetes.io/aws-load-balancer-internal: "true"
    # GCP
    cloud.google.com/load-balancer-type: "Internal"
spec:
  type: LoadBalancer
  selector:
    app: ${APP_NAME}
  ports:
    - port: 443
      targetPort: 8443

Headless Service (StatefulSet)

apiVersion: v1
kind: Service
metadata:
  name: ${APP_NAME}-headless
spec:
  clusterIP: None
  selector:
    app: ${APP_NAME}
  ports:
    - port: 5432
      targetPort: 5432

Ingress

NGINX Ingress

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ${APP_NAME}
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
    cert-manager.io/cluster-issuer: letsencrypt-prod
spec:
  ingressClassName: nginx
  tls:
    - hosts:
        - ${DOMAIN}
      secretName: ${APP_NAME}-tls
  rules:
    - host: ${DOMAIN}
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: ${APP_NAME}
                port:
                  number: 80

Multiple Paths

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: api-ingress
spec:
  ingressClassName: nginx
  rules:
    - host: api.example.com
      http:
        paths:
          - path: /v1
            pathType: Prefix
            backend:
              service:
                name: api-v1
                port:
                  number: 80
          - path: /v2
            pathType: Prefix
            backend:
              service:
                name: api-v2
                port:
                  number: 80

ConfigMap & Secret

ConfigMap

apiVersion: v1
kind: ConfigMap
metadata:
  name: ${APP_NAME}-config
data:
  # Simple key-value
  LOG_LEVEL: "info"
  API_URL: "https://api.example.com"
  
  # Multi-line file
  config.yaml: |
    server:
      port: 8080
      host: 0.0.0.0
    database:
      pool_size: 10

Secret

apiVersion: v1
kind: Secret
metadata:
  name: ${APP_NAME}-secrets
type: Opaque
stringData:  # Plain text (base64 encoded on apply)
  DATABASE_URL: "postgresql://user:pass@host:5432/db"
  API_KEY: "secret-api-key"
---
# Or with base64 encoded data
apiVersion: v1
kind: Secret
metadata:
  name: ${APP_NAME}-secrets
type: Opaque
data:  # Already base64 encoded
  password: cGFzc3dvcmQxMjM=  # echo -n "password123" | base64

Docker Registry Secret

apiVersion: v1
kind: Secret
metadata:
  name: regcred
type: kubernetes.io/dockerconfigjson
data:
  .dockerconfigjson: <base64-encoded-docker-config>

# Create via kubectl
kubectl create secret docker-registry regcred \
  --docker-server=ghcr.io \
  --docker-username=$USER \
  --docker-password=$TOKEN

StatefulSet

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: ${APP_NAME}
spec:
  serviceName: ${APP_NAME}-headless
  replicas: 3
  selector:
    matchLabels:
      app: ${APP_NAME}
  template:
    metadata:
      labels:
        app: ${APP_NAME}
    spec:
      containers:
        - name: ${APP_NAME}
          image: ${IMAGE}
          ports:
            - containerPort: 5432
          volumeMounts:
            - name: data
              mountPath: /var/lib/data
  volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: ["ReadWriteOnce"]
        storageClassName: standard
        resources:
          requests:
            storage: 10Gi

CronJob

apiVersion: batch/v1
kind: CronJob
metadata:
  name: ${JOB_NAME}
spec:
  schedule: "0 2 * * *"  # Daily at 2 AM
  concurrencyPolicy: Forbid
  successfulJobsHistoryLimit: 3
  failedJobsHistoryLimit: 1
  jobTemplate:
    spec:
      backoffLimit: 3
      activeDeadlineSeconds: 3600
      template:
        spec:
          restartPolicy: OnFailure
          containers:
            - name: ${JOB_NAME}
              image: ${IMAGE}
              command: ["/bin/sh", "-c"]
              args:
                - |
                  echo "Running backup..."
                  /scripts/backup.sh
              envFrom:
                - secretRef:
                    name: ${JOB_NAME}-secrets

HorizontalPodAutoscaler

apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: ${APP_NAME}
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: ${APP_NAME}
  minReplicas: 2
  maxReplicas: 10
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70
    - type: Resource
      resource:
        name: memory
        target:
          type: Utilization
          averageUtilization: 80
  behavior:
    scaleDown:
      stabilizationWindowSeconds: 300
      policies:
        - type: Percent
          value: 10
          periodSeconds: 60
    scaleUp:
      stabilizationWindowSeconds: 0
      policies:
        - type: Percent
          value: 100
          periodSeconds: 15

PersistentVolumeClaim

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ${APP_NAME}-data
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: standard  # Or gp2, premium-rwo, etc.
  resources:
    requests:
      storage: 10Gi

NetworkPolicy

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: ${APP_NAME}-policy
spec:
  podSelector:
    matchLabels:
      app: ${APP_NAME}
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - podSelector:
            matchLabels:
              app: frontend
        - namespaceSelector:
            matchLabels:
              name: monitoring
      ports:
        - port: 8080
          protocol: TCP
  egress:
    - to:
        - podSelector:
            matchLabels:
              app: database
      ports:
        - port: 5432
    - to:  # Allow DNS
        - namespaceSelector: {}
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - port: 53
          protocol: UDP

ServiceAccount with RBAC

apiVersion: v1
kind: ServiceAccount
metadata:
  name: ${APP_NAME}
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: ${APP_NAME}-role
rules:
  - apiGroups: [""]
    resources: ["pods", "configmaps"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["secrets"]
    verbs: ["get"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: ${APP_NAME}-binding
subjects:
  - kind: ServiceAccount
    name: ${APP_NAME}
roleRef:
  kind: Role
  name: ${APP_NAME}-role
  apiGroup: rbac.authorization.k8s.io

PodDisruptionBudget

apiVersion: policy/v1
kind: PodDisruptionBudget
metadata:
  name: ${APP_NAME}
spec:
  selector:
    matchLabels:
      app: ${APP_NAME}
  minAvailable: 2  # Or use maxUnavailable: 1

Resource Quotas

apiVersion: v1
kind: ResourceQuota
metadata:
  name: ${NAMESPACE}-quota
spec:
  hard:
    requests.cpu: "10"
    requests.memory: "20Gi"
    limits.cpu: "20"
    limits.memory: "40Gi"
    pods: "50"
    persistentvolumeclaims: "10"
---
apiVersion: v1
kind: LimitRange
metadata:
  name: ${NAMESPACE}-limits
spec:
  limits:
    - type: Container
      default:
        cpu: "500m"
        memory: "512Mi"
      defaultRequest:
        cpu: "100m"
        memory: "128Mi"
      max:
        cpu: "2"
        memory: "4Gi"

Complete Application Stack

# namespace.yaml
apiVersion: v1
kind: Namespace
metadata:
  name: ${NAMESPACE}
  labels:
    name: ${NAMESPACE}
---
# configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: ${APP_NAME}-config
  namespace: ${NAMESPACE}
data:
  LOG_LEVEL: "info"
---
# secret.yaml
apiVersion: v1
kind: Secret
metadata:
  name: ${APP_NAME}-secrets
  namespace: ${NAMESPACE}
type: Opaque
stringData:
  DATABASE_URL: "postgresql://..."
---
# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
spec:
  replicas: 3
  selector:
    matchLabels:
      app: ${APP_NAME}
  template:
    metadata:
      labels:
        app: ${APP_NAME}
    spec:
      containers:
        - name: ${APP_NAME}
          image: ${IMAGE}:${TAG}
          ports:
            - containerPort: 8080
          envFrom:
            - configMapRef:
                name: ${APP_NAME}-config
            - secretRef:
                name: ${APP_NAME}-secrets
          resources:
            requests:
              cpu: "100m"
              memory: "128Mi"
            limits:
              cpu: "500m"
              memory: "512Mi"
          livenessProbe:
            httpGet:
              path: /healthz
              port: 8080
            initialDelaySeconds: 15
            periodSeconds: 10
          readinessProbe:
            httpGet:
              path: /ready
              port: 8080
            initialDelaySeconds: 5
            periodSeconds: 5
---
# service.yaml
apiVersion: v1
kind: Service
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
spec:
  selector:
    app: ${APP_NAME}
  ports:
    - port: 80
      targetPort: 8080
---
# hpa.yaml
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: ${APP_NAME}
  namespace: ${NAMESPACE}
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: ${APP_NAME}
  minReplicas: 2
  maxReplicas: 10
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: 70

k8s-manifests

Install

Kubernetes Manifest Templates

Quick Generation

Deployment

Standard Deployment

Deployment with Init Container

Services

ClusterIP (internal)

NodePort (external via node)

LoadBalancer (cloud provider)

Headless Service (StatefulSet)

Ingress

NGINX Ingress

Multiple Paths

ConfigMap & Secret

ConfigMap

Secret

Docker Registry Secret

StatefulSet

CronJob

HorizontalPodAutoscaler

PersistentVolumeClaim

NetworkPolicy

ServiceAccount with RBAC

PodDisruptionBudget

Resource Quotas

Complete Application Stack

Categories

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