Test your deployment
- Complete all the previous sections of this guide, starting with Containerize a Node.js application.
- Turn on Kubernetes in Docker Desktop.
In this section, you'll learn how to use Docker Desktop to deploy your application to a fully-featured Kubernetes environment on your development machine. This allows you to test and debug your workloads on Kubernetes locally before deploying.
In the cloned repository's directory, create a file name
docker-node-kubernetes.yaml. Open the file in an IDE or text editor and add the following contents.
DOCKER_USERNAME/REPO_NAME with your Docker username and the name of the repository that you created in
Configure CI/CD for your Node.js application.
apiVersion: apps/v1 kind: Deployment metadata: name: docker-nodejs-demo namespace: default spec: replicas: 1 selector: matchLabels: todo: web template: metadata: labels: todo: web spec: containers: - name: todo-site image: DOCKER_USERNAME/REPO_NAME imagePullPolicy: Always --- apiVersion: v1 kind: Service metadata: name: todo-entrypoint namespace: default spec: type: NodePort selector: todo: web ports: - port: 3000 targetPort: 3000 nodePort: 30001
In this Kubernetes YAML file, there are two objects, separated by the
- A Deployment, describing a scalable group of identical pods. In this case, you'll get just one replica, or copy of your pod, and that pod (which is described under the template: key) has just one container in it, based off of the image built by GitHub Actions in Configure CI/CD for your Node.js application.
- A NodePort service, which will route traffic from port 30001 on your host to port 3000 inside the pods it routes to, allowing you to reach your app from the network.
To learn more about Kubernetes objects, see the Kubernetes documentationopen_in_new.
In a terminal, navigate to where you created
docker-node-kubernetes.yamland deploy your application to Kubernetes.
$ kubectl apply -f docker-node-kubernetes.yaml
You should see output that looks like the following, indicating your Kubernetes objects were created successfully.
deployment.apps/docker-nodejs-demo created service/todo-entrypoint created
Make sure everything worked by listing your deployments.
$ kubectl get deployments
Your deployment should be listed as follows:
NAME READY UP-TO-DATE AVAILABLE AGE docker-nodejs-demo 1/1 1 1 6s
This indicates all one of the pods you asked for in your YAML are up and running. Do the same check for your services.
$ kubectl get services
You should get output like the following.
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 7d22h todo-entrypoint NodePort 10.111.101.229 <none> 3000:30001/TCP 33s
In addition to the default
kubernetesservice, you can see your
todo-entrypointservice, accepting traffic on port 30001/TCP.
Open a browser and visit your app at
localhost:30001. You should see your application.
Run the following command to tear down your application.
$ kubectl delete -f docker-node-kubernetes.yaml
In this section, you learned how to use Docker Desktop to deploy your application to a fully-featured Kubernetes environment on your development machine.