What’s Kompose? It’s a conversion tool for all things compose (namely Docker Compose) to container orchestrators (Kubernetes or OpenShift).
In three simple steps, we’ll take you from Docker Compose to Kubernetes.
1. Take a sample docker-compose.yaml file
version: "2" services: redis-master: image: gcr.io/google_containers/redis:e2e 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:v4 ports: - "80:80" environment: - GET_HOSTS_FROM=dns labels: kompose.service.type: LoadBalancer
kompose up in the same directory
$ kompose up We are going to create Kubernetes Deployments, Services and PersistentVolumeClaims for your Dockerized application. If you need different kind of resources, use the 'kompose convert' and 'kubectl create -f' commands instead. INFO Successfully created Service: redis INFO Successfully created Service: web INFO Successfully created Deployment: redis INFO Successfully created Deployment: web Your application has been deployed to Kubernetes. You can run 'kubectl get deployment,svc,pods,pvc' for details.
Alternatively, you can run
kompose convert and deploy with
kompose convert in the same directory
$ kompose convert INFO Kubernetes file "frontend-service.yaml" created INFO Kubernetes file "redis-master-service.yaml" created INFO Kubernetes file "redis-slave-service.yaml" created INFO Kubernetes file "frontend-deployment.yaml" created INFO Kubernetes file "redis-master-deployment.yaml" created INFO Kubernetes file "redis-slave-deployment.yaml" created
2.2. And start it on Kubernetes!
$ kubectl create -f frontend-service.yaml,redis-master-service.yaml,redis-slave-service.yaml,frontend-deployment.yaml,redis-master-deployment.yaml,redis-slave-deployment.yaml service "frontend" created service "redis-master" created service "redis-slave" created deployment "frontend" created deployment "redis-master" created deployment "redis-slave" created
3. View the newly deployed service
Now that your service has been deployed, let’s access it.
If you’re already using
minikube for your development process:
$ minikube service frontend
Otherwise, let’s look up what IP your service is using!
$ kubectl describe svc frontend Name: frontend Namespace: default Labels: service=frontend Selector: service=frontend Type: LoadBalancer IP: 10.0.0.183 LoadBalancer Ingress: 22.214.171.124 Port: 80 80/TCP NodePort: 80 31144/TCP Endpoints: 172.17.0.4:80 Session Affinity: None No events.
If you’re using a cloud provider, your IP will be listed next to
$ curl http://126.96.36.199