Tip: All files can be found in GitHub
Build a simple and EKS Docker Stack with Terraform to run a NodeJS App to say Hello World, fed by traffic from an Application Load Balancer. WARNING: This module and the automated tests for it deploy real resources into your AWS account which can cost you money.
- AWS EKS
- npm
- Terraform
- NodeJS
- Docker
- Kubernetes
- LoadBalance
- Linux Ubuntu
- Kubectl
- Docker hub
Login to AWS with AWS CLI and install all the above technologies and create yourself account where necessary.
Following all process from Hashicorp ending on the deployments so do not need to do Deploy and access Kubernetes Dashboard.
Run the following command to retrieve the access credentials for your cluster and automatically configure kubectl.
aws eks --region $(terraform output region) update-kubeconfig --name $(terraform output cluster_name)
Updated context arn:aws:eks:us-east-2:896122536643:cluster/training-eks-0gw7XQwP in /home/ubuntu/.kube/config
Install Kubectl Find how to Install kubectl from this page.
Expose External IP Exposing an External IP Address to Access an Application in a Cluster process. Following the process from the pages above with my customisation to point to my app on Docker Hub.
Download the laodbalance file.
kubectl apply -f https://k8s.io/examples/service/load-balancer-example.yaml
Or create a file in your computer if you wish to customise as per my example below. The custom change to my script is to the script deployment point to my Docker Hub app by change this line "- image: gcr.io/google-samples/node-hello:1.0" to point to my repository instead "- image: docker.io/vschmaltz/hello-world" on Docker Hub and load my Hello World app that I will explain below how to create and upload to your repository.
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app.kubernetes.io/name: load-balancer-example
name: hello-world
spec:
replicas: 5
selector:
matchLabels:
app.kubernetes.io/name: load-balancer-example
template:
metadata:
labels:
app.kubernetes.io/name: load-balancer-example
spec:
containers:
- image: docker.io/vschmaltz/hello-world
name: hello-world
ports:
- containerPort: 8080
Run the yaml script by this below command:
kubectl apply -f load-balancer-example.yaml
deployment.apps/hello-world created
kubectl get replicasets
NAME DESIRED CURRENT READY AGE
hello-world-697d76678 5 5 5 2m42s
kubectl expose deployment hello-world --type=LoadBalancer --name=my-service
service/my-service exposed
kubectl get services my-service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
my-service LoadBalancer 172.20.89.199 ad6c509a886234dcd91d5311f74cdbae-368390956.us-east-2.elb.amazonaws.com 8080:30596/TCP 57s
curl ad6c509a886234dcd91d5311f74cdbae-368390956.us-east-2.elb.amazonaws.com:8080
Hello World!
Tip: If you got Could not resolve host error:
curl: (6) Could not resolve host: a9106ca9883d0412da85aac64429ac36-14558414.us-east-2.elb.amazonaws.com
This error happens if you forgot to Configure kubectl so run it again:
aws eks --region $(terraform output region) update-kubeconfig --name $(terraform output cluster_name)
kubectl describe services my-service
Name: my-service
Namespace: default
Labels: app.kubernetes.io/name=load-balancer-example
Annotations: <none>
Selector: app.kubernetes.io/name=load-balancer-example
Type: LoadBalancer
IP: 172.20.89.199
LoadBalancer Ingress: ad6c509a886234dcd91d5311f74cdbae-368390956.us-east-2.elb.amazonaws.com
Port: <unset> 8080/TCP
TargetPort: 8080/TCP
NodePort: <unset> 30596/TCP
Endpoints: 10.0.1.108:8080,10.0.1.125:8080,10.0.3.200:8080 + 2 more...
Session Affinity: None
External Traffic Policy: Cluster
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal EnsuringLoadBalancer 4m23s service-controller Ensuring load balancer
Normal EnsuredLoadBalancer 4m21s service-controller Ensured load balancer
Follow with below commands if you wish to delete your Kubernetes LoadBalance and Replicas with commands.
kubectl delete services my-service
service "my-service" deleted
2 To delete the Deployment, the ReplicaSet, and the Pods that are running the Hello World application, enter this command:
kubectl delete deployment hello-world
mkdir node
cd node
File on GitHub Copy the below code into your file app.js
nano app.js
const express = require('express')
const app = express()
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(8080, () => console.log('Server ready'))
Save and close nano.
nano docker-compose.yaml
Copy the below code to your file docker-compose.yaml
version: "2"
services:
node:
image: "node:8"
user: "node"
working_dir: /home/node/app
environment:
- NODE_ENV=production
volumes:
- ./:/home/node/app
ports:
- 8080:8080
command: "npm start"
Save and close nano.
Add the below code line to file package.json
"start": "node app.js"
The final code should look like this below code:
{
"name": "node",
"version": "1.0.0",
"main": "app.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "node app.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"express": "^4.17.1"
},
"description": ""
}
Save it and close nano.
Install npm by
sudo apt install npm
And Solve one dependency. Need to add it to the package.json file, so I run
npm init -y
npm install express
nano Dockerfile
FROM node:14
WORKDIR /usr/src/app
COPY package*.json app.js ./
RUN npm install
EXPOSE 8080
CMD ["node", "app.js"]
Save and close nano.
sudo docker-compose up -d
Use without -d if you wish to see the service running.
http:// Your IP : your port
Make sure the doors are open on the server as I have updated this one to listen on 8080 port on AWS EC2 in order to show hello word locally.
docker build -t nodeapp .
Successful result
nodeapp_v2:latest
Run container
docker run -d -p 8080:8080 --name node-app examplenode
Stop container
sudo docker stop node-app
List container
docker container ls -l
Remove container
docker container rm 978bcd06a78d
List images
docker images
docker.io/username/hello-world
docker login --username=username
docker images
docker tag f4ccc42d64e9 username/hello-world
docker push username/hello-world
Good luck and get in touch if you need so.
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