K8S 內部App之間的連線

$ minikube start --driver=docker
$ eval $(minikube docker-env)
=> 這個指令一定要做，才能使用local image

- 後端App:

const express = require('express');
const app = express();

app.get('/', function (req, res) {
   res.send('Vic’s test service!');
});

app.listen(7000, () => {
  console.log('Listening on port 7000!');
});

FROM node:8.9-alpine
RUN mkdir -p /test_service
WORKDIR /test_service
COPY index.js /test_service
RUN npm install express
EXPOSE 7000
CMD [ "node", "index.js" ]

$ docker build -t vic/test_service .

$ docker images |grep test_service
=> 用關鍵字找
$ docker images
=> 列出全部

$ kubectl create deployment test-service --image=vic/test_service

$ minikube dashboard --url

$ kubectl get deployment test-service

$ kubectl get pods

$ kubectl expose deployment test-service --port=7000 --target-port=7000

$ kubectl get services

- 前端App:

const express = require('express');
const app = express();
const unirest = require('unirest');

app.get('/testClient', function (req, res) {
   unirest.get('http://test-service:7000').end(function(response) {
      if (response.error) {
         console.log('fail');
         res.send('Call API fail');
      }
　　　else {
         res.send(response.body);
      }
   });
});

app.listen(8000, () => {
  console.log('Listening on port 8000!');
});

FROM node:8.9-alpine
RUN mkdir -p /test_client
WORKDIR /test_client
COPY index.js /test_client
RUN npm install express
RUN npm install unirest
EXPOSE 8000
CMD [ "node", "index.js" ]

$ docker build -t vic/test_client .

$ kubectl create deployment test-client --image=vic/test_client

$ kubectl get deployment test-client

$ kubectl get pods

$ kubectl expose deployment test-client --port=8000 --target-port=8000

$ kubectl get services

$ minikube addons enable ingress

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  name: test-client-ing
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /$1
spec:
  rules:
  - host: test.client
    http:
      paths:
      - path: /(.*|$)
        backend:
          serviceName: test-client
          servicePort: 8000

$ kubectl apply -f test-client-ingress.yaml

$ kubectl get ingress

$ sudo nano /etc/hosts

- 測試結果: