HTTP Application

This http-application.yaml manifest defines a Deployment and a corresponding Service to deploy and expose a hello-world application within a Kubernetes cluster.

Deployment - hello-world:

• Creates a Deployment named hello-world.
• Specifies one replica for the hello-world application.
• Sets the selector to match pods labeled with app: hello-world.
• Defines a pod template labeled app: hello-world with a container named app running the specified Rails-based hello-world image on port 3000 using the TCP protocol.

Service - hello-world:

• Creates a LoadBalancer-type Service named hello-world.
• Includes annotations for monitoring configurations, specifying the HTTP path /, method get, and protocol http.
• Specifies the service type as LoadBalancer, enabling external access.
• Selects pods labeled with app: hello-world for load balancing.
• Exposes port 80 using the TCP protocol and directs traffic to the web targetPort.

File http-application.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-world
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-world
  template:
    metadata:
      labels:
        app: hello-world
    spec:
      containers:
        - name: app
          image: vcr.vngcloud.vn/60108-cuongdm3/rails-hello-world
          ports:
            - name: web
              containerPort: 3000
              protocol: TCP
---

kind: Service
apiVersion: v1
metadata:
  name: hello-world
  annotations:
    vks.vngcloud.vn/monitor-http-path: "/"
    vks.vngcloud.vn/monitor-http-method: "get"
    vks.vngcloud.vn/monitor-protocol: "http"
spec:
  type: LoadBalancer
  selector:
    app: hello-world
  ports:
    - name: http
      protocol: TCP
      port: 80
      targetPort: web

kubectl apply -f http-application.yaml

kubectl get pods,svc -owide

Access the hello-world application via the public endpoint.