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How To Deploy Express With Amazon EKS

Learn how to deploy an Express app to Amazon EKS.

Prerequisites

  • Follow the getting started guide and make sure the following are installed:
    • AWS CLI
    • kubectl
    • eksctl
  • https://docs.aws.amazon.com/eks/latest/userguide/getting-started.html

Initial Setup

  • Install Express.

    npm init
    npm install express --save
    
  • Create express app. app.js

    const express = require("express");
    const app = express();
    const port = 3000;
    
    app.get("/", (req, res) => {
      res.send("Hello World!");
    });
    
    app.listen(port, () => {
      console.log(`Example app listening on port ${port}`);
    });
    
  • Create Dockerfile.

    FROM node:16
    WORKDIR /usr/src/app
    COPY package.json ./
    RUN npm install
    COPY . .
    CMD [ "node", "app.js" ]
    
  • Build image.

    docker build -t express-eks .
    
  • Run container.

    docker run -p 3000:3000 -it --rm --name express-eks-run express-eks
    

Elastic Container Registry (ECR) Setup

  • Go to Amazon ECR.
  • Create a repository.
  • Click on "View push commands".
  • Follow the instructions to push image.
  • Copy the image url.

Elastic Kubernetes Service (EKS) Setup

  • Create EKS cluster.

    eksctl create cluster --name my-cluster --region us-west-2
    
  • Confirm communication with cluster.

    kubectl get svc
    
  • Create yaml configuration. k8s.yaml

    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: myapp
    spec:
      selector:
        matchLabels:
          app: myapp
      template:
        metadata:
          labels:
            app: myapp
        spec:
          containers:
            - name: myapp
              image: 111111111111.dkr.ecr.us-east-2.amazonaws.com/myapp:latest
              resources:
                limits:
                  memory: "128Mi"
                  cpu: "500m"
              ports:
                - name: tcp
                  containerPort: 3000
    ---
    apiVersion: v1
    kind: Service
    metadata:
      name: myapp
    spec:
      selector:
        app: myapp
      ports:
        - port: 80
          targetPort: 3000
      type: LoadBalancer
    
  • Apply manifest.

    kubectl apply -f k8s.yaml
    
  • Confirm pods.

    kubectl get pod
    
  • Open shell into pod.

    kubectl exec -it myapp-7487b94844-wvfmn -- bash
    
  • Confirm load balancer.

    kubectl get svc
    
  • Confirm load balancer domain.

    nslookup af220a880523a491a991ecc793ae1da2-125775810.us-west-2.elb.amazonaws.com
    

    Note: This might take a few minutes.

  • Confirm response from app.

    curl af220a880523a491a991ecc793ae1da2-125775810.us-west-2.elb.amazonaws.com
    

Deploy Script

  • Use this script to deploy latest commits.
LATEST_SHA=$(git rev-parse HEAD)
docker build -t express-eks:$LATEST_SHA .
docker tag express-eks:$LATEST_SHA 207100238581.dkr.ecr.us-east-2.amazonaws.com/express-eks:$LATEST_SHA
docker push 207100238581.dkr.ecr.us-east-2.amazonaws.com/express-eks:$LATEST_SHA
kubectl set image deployment/myapp myapp=207100238581.dkr.ecr.us-east-2.amazonaws.com/express-eks:$LATEST_SHA -n default

Set up AWS Load Balancer Controller

For more complex traffic routing, see how-to-set-up-aws-load-balancer-controller.md.

Delete cluster

  • Delete the cluster avoid large AWS bill.

    eksctl delete cluster --name my-cluster
    

References