Kompose takes existing Docker Compose files and enables them to be deployed onto Kubernetes. Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a Compose file to configure your application’s services.

Task

Copy an example Docker Compose file to the editor.

version: "2"
services:
  redis-master:
    image: redis:latest
    ports:
      - "6379"
  redis-slave:
    image: gcr.io/google_samples/gb-redisslave:v1
    ports:
      - "6379"
    environment:
      - GET_HOSTS_FROM=dns
  frontend:
    image: gcr.io/google-samples/gb-frontend:v3
    ports:
      - "80:80"
    environment:
      - GET_HOSTS_FROM=dns

As with Docker Compose, Kompose allows the Images to be deployed using a single command of kompose up

The details of what has been deployed can be discovered with the Kubernetes CLI kubectl.

kubectl get deployment,svc,pods,pvc

Kompose also has the ability to take existing Compose files and generate the related Kubernetes Manifest files.

The command kompose convert will generate the files, viewable via ls.

With the files converted, they too can be deployed using Kubectl. This will match the existing deployment applied via kompose up.

kubectl apply -f frontend-service.yaml,redis-master-service.yaml,redis-slave-service.yaml,frontend-deployment.yaml,redis-master-deployment.yaml,redis-slave-deployment.yaml

Kompose also supports different Kubernetes distributions, for example OpenShift.

kompose --provider openshift convert

By default, Kompose generates YAML files. It's possible to generate JSON based files by specifying the -j parameter.

kompose convert -j