This topic describes how to deploy applications that provide services by using an Ingress on a virtual node of a Container Service for Kubernetes (ACK) cluster. This allows you to provide the applications with scalable and unlimited computing capacities without the need to create new nodes in the cluster. This also ensures the elasticity of the applications to withstand traffic fluctuations.

Prerequisites

Procedure

  1. Log on to the ACK console.
  2. In the left-side navigation pane of the ACK console, click Clusters.
  3. On the Clusters page, find the cluster that you want to manage and click the name of the cluster or click Details in the Actions column. The details page of the cluster appears.
  4. In the left-side navigation pane of the details page, choose Workloads > Deployments.
  5. In the upper-right corner of the page, click Create from Template.
  6. Select a sample template or customize a template, and click Create.
    Sample template
    You can use the following YAML template to create applications and an Ingress that is used to enable access to the applications: 
    apiVersion: apps/v1
kind: Deployment
metadata:
  name: coffee
spec:
  replicas: 2
  selector:
    matchLabels:
      app: coffee
  template:
    metadata:
      labels:
        app: coffee
    spec:
      containers:
      - name: coffee
        image: nginxdemos/hello:plain-text
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: coffee-svc
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
  selector:
    app: coffee
  clusterIP: None
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: tea
spec:
  replicas: 3
  selector:
    matchLabels:
      app: tea
  template:
    metadata:
      labels:
        app: tea
    spec:
      containers:
      - name: tea
        image: nginxdemos/hello:plain-text
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: tea-svc
  labels:
spec:
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
  selector:
    app: tea
  clusterIP: None
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: cafe-ingress
spec:
  rules:
  - host: cafe.example.com
    http:
      paths:
      - path: /tea
        backend:
          serviceName: tea-svc
          servicePort: 80
      - path: /coffee
        backend:
          serviceName: coffee-svc
          servicePort: 80

Verify the result

  • In the left-side navigation pane of the cluster details page, choose Workloads > Deployments. You can find the newly created coffee and tea applications.
  • In the left-side navigation pane of the cluster details page, choose Workloads > Pods. You can verify that the pods of the newly created applications run on virtual-kubelet nodes.
  • On the details page of the cluster, choose Network > Ingresses. You can find the newly created Ingress.
  • Run the following command to query the Ingress. Then, test access to the Ingress. 
    kubectl  get ing

    Expected output:

    NAME           HOSTS              ADDRESS          PORTS   AGE
cafe-ingress   cafe.example.com   114.55.252.185   80      6m18s

    Run the following command to access "Host:cafe.example.com" <EXTERNAL_IP>/tea to test whether the tea application can be accessed: 

    curl -H "Host:cafe.example.com" <EXTERNAL_IP>/tea

    Expected output:

    Server address: 192.168.xx.xx:80
Server name: tea-658d56f6cc-cxxxx
Date: 25/Sep/2020:12:36:50 +0000
URI: /tea
Request ID: b01d5bab9ae07abb8bc385377193xxxx

    Run the following command to access "Host:cafe.example.com" <EXTERNAL_IP>/coffee to test whether the coffee application can be accessed: 

    curl -H "Host:cafe.example.com" <EXTERNAL_IP>/coffee

    Expected output:

    Server address: 192.168.xx.xx:80
Server name: coffee-8c8ff9b4f-hxxxx
Date: 25/Sep/2020:12:36:47 +0000
URI: /coffee
Request ID: 722fe41a65a7fb552613c56e0a9axxxx