A Beginner's Guide to Kubernetes

Develop Denver, October 18, 2018

Steps

Prebuilt:

1. Build an app
   • The Node.js app is done! See package.json, index.js, and the public directory
   • Run npm install and npm start to run the app locally
2. Turn the app into a Docker image
   • See Dockerfile
   • docker build -t kimschles/dvlp-2018 .
   • To create a container locally, run docker run -p 8080:8080 kimschles/dvlp-2018
   • See the app at http://localhost:8080/
3. Push the image to a registry
   • docker push kimschles/dvlp-2018
   • https://hub.docker.com/r/kimschles/dvlp-2018/

To Do:

4. Create a K8s cluster with GKE
   • Go to https://cloud.google.com/
   • Create a project
   • Create a cluster with Google Kubernetes Engine
   • Connect with Cloud Shell
   • git clone this repo
   • cd beginners_guide_to_k8s
5. Deploy the app to a cluster
   • kubectl apply -f app/namespace.yml
   • kubectl apply -f app/deployment.yml
6. Expose the app to the internet

• kubectl apply -f app/hpa.yml

7. Add some cool K8s stuff
   • Increase the number of replicas
   • Horizontal Pod AutoScaler
     • Test with Apache Bench ab -n 30000 -c 100 http://[external_ip]:[port]/
   • Rolling Updates
8. Delete your hpa, service, deployment and cluster!