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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

To Do:

  1. 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
  2. Deploy the app to a cluster
    • kubectl apply -f app/namespace.yml
    • kubectl apply -f app/deployment.yml
  3. Expose the app to the internet
  • kubectl apply -f app/hpa.yml
  1. 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
  2. Delete your hpa, service, deployment and cluster!

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A talk given at Develop Denver 2018

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