Service examples

Примеры использования service.

Pod

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: cam-nginx
  namespace: default
  labels:
    app: nginx
    environment: prod
  annotations:
    author: cameda
spec:
  containers:
  - name: nginx
    image: nginx:latest
    imagePullPolicy: IfNotPresent
    ports:
    - containerPort: 80
    - containerPort: 443
    resources:
      requests:
        cpu: 300m
        memory: 300Mi
      limits:
        memory: 400Mi
  restartPolicy: Always
  hostname: nginx
  subdomain: web
EOF

Deployment

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: cameda-nginx
  namespace: default
  labels:
    app: nginx
    environment: prod
  annotations:
    author: cameda
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  strategy: 
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        imagePullPolicy: IfNotPresent
        ports: 
        - name: http
          containerPort: 80
        resources: 
          requests: 
            cpu: 300m
            memory: 300Mi 
          limits: 
            memory: 400Mi
      restartPolicy: Always
      hostname: nginx
      subdomain: web
      dnsPolicy: ClusterFirst
      terminationGracePeriodSeconds: 90
EOF

Service NodePort

#Минимальный вариант.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service1
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
EOF

#Указываем targetPort/nodePort.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service2
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
    nodePort: 30010
EOF

#Открываем два порта.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service3
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
  - name: https
    protocol: TCP
    port: 443
EOF

#На подах видны адреса источников обращения. Также идёт привязка сессий.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service4
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: NodePort
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
  externalTrafficPolicy: Local
  sessionAffinity: ClientIP
EOF

Service ClusterIP

#Минимальный вариант.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service5
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: ClusterIP
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
EOF

#Указываем targetPort.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service6
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: ClusterIP
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
EOF

#Открываем два порта.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service7
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: ClusterIP
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
  - name: https
    protocol: TCP
    port: 443
EOF

Service LoadBalancer

#Простой сервис типа балансер.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service8
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: LoadBalancer
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
EOF

#Внутренний балансировщик
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service9
  annotations:
    # Тип балансировщика: внутренний.
    yandex.cloud/load-balancer-type: internal
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: LoadBalancer
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
EOF

#Балансировщик с зарезервированным адресом, проброской адреса источника в под.
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service10
  annotations:
    yandex.cloud/subnet-id: <subnet-id>
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: LoadBalancer
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
  externalTrafficPolicy: Local
  loadBalancerIP: <заранее зарезервированный IP-адрес>
EOF

#Балансировщик с зарезервированным адресом, проброской адреса источника в под и привязкой сессий
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Service
metadata:
  namespace: default
  name: nginx-service11
  annotations:
    yandex.cloud/subnet-id: <subnet-id>
  labels:
    environment: prod
  annotations:
    author: cameda
spec:
  type: LoadBalancer
  selector:
    app: nginx
  ports:
  - name: http
    protocol: TCP
    port: 80
    targetPort: 80
  - name: https
    protocol: TCP
    port: 443
    targetPort: 443
  externalTrafficPolicy: Local
  loadBalancerIP: <заранее зарезервированный IP-адрес>
  sessionAffinity: ClientIP
EOF