NodePort

清单文件

---
apiVersion: v1
kind: Service
metadata:
  name: myapp-svc
  labels:
    app: myapp
    release: stable
spec:
  selector:
    app: myapp
    release: stable
  # Service类型为NodePort
  type: NodePort
  ports:
  - name: myapp
    # Node宿主机监听端口为30080
    nodePort: 30080
    # Service服务监听端口为80
    port: 80
    protocol: TCP
    # Pods服务端口为app-port也就是80
    targetPort: app-port
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deploy
  namespace: default
spec:
  replicas: 3
  revisionHistoryLimit: 3
  selector:
    matchLabels:
      app: myapp
      release: stable
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 0
  template:
    metadata:
      name: myapp-container
      namespace: default
      labels:
        app: myapp
        release: stable
    spec:
      containers:
      - name: myapp-container
        image: ikubernetes/myapp:v1
        ports:
        - name: app-port
          containerPort: 80
          protocol: TCP

测试效果 获取Service信息

# kubectl get svc -o wide
NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)        AGE       SELECTOR
kubernetes   ClusterIP   10.96.0.1        <none>        443/TCP        7d        <none>
myapp-svc    NodePort    10.105.231.167   <none>        80:30080/TCP   7m        app=myapp,release=stable

获取详细详细信息

# kubectl describe myapp-svc
error: the server doesn't have a resource type "myapp-svc"
[root@node001 mainifest]# kubectl describe svc myapp-svc
Name:                     myapp-svc
Namespace:                default
Labels:                   app=myapp
                          release=stable
Annotations:              kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"app":"myapp","release":"stable"},"name":"myapp-svc","namespace":"default"},...
Selector:                 app=myapp,release=stable
Type:                     NodePort
IP:                       10.105.231.167
Port:                     myapp  80/TCP
TargetPort:               app-port/TCP
NodePort:                 myapp  30080/TCP
Endpoints:                10.244.1.41:80,10.244.2.128:80,10.244.2.129:80
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

测试访问

# curl node002:30080/hostname.html
myapp-deploy-6f96c5bb-c8sh7
[root@node001 mainifest]# curl node002:30080/hostname.html
myapp-deploy-6f96c5bb-22z7q
[root@node001 mainifest]# curl node002:30080/hostname.html
myapp-deploy-6f96c5bb-zrdv4
# kubectl get pods -o wide
NAME                          READY     STATUS    RESTARTS   AGE       IP             NODE
myapp-deploy-6f96c5bb-22z7q   1/1       Running   0          9m        10.244.2.129   node003
myapp-deploy-6f96c5bb-c8sh7   1/1       Running   0          9m        10.244.2.128   node003
myapp-deploy-6f96c5bb-zrdv4   1/1       Running   0          9m        10.244.1.41    node002

通过dns访问测试

# kubectl run -it client --image=busybox -- /bin/sh
/ # wget -q -O - http://myapp-svc.default.svc.cluster.local/hostname.html
myapp-deploy-6f96c5bb-c8sh7
/ # wget -q -O - http://myapp-svc.default.svc.cluster.local/hostname.html
myapp-deploy-6f96c5bb-22z7q
/ # wget -q -O - http://myapp-svc.default.svc.cluster.local/hostname.html
myapp-deploy-6f96c5bb-zrdv4