# Compose on Kubernetes [![CircleCI](https://circleci.com/gh/docker/compose-on-kubernetes/tree/master.svg?style=svg)](https://circleci.com/gh/docker/compose-on-kubernetes/tree/master) Compose on Kubernetes allows you to deploy Docker Compose files onto a Kubernetes cluster. # Table of contents - [Get started](#get-started) - [Developing Compose on Kubernetes](#developing-compose-on-kubernetes) More documentation can be found in the [docs/](./docs) directory. This includes: - [Architecture](./docs/architecture.md) - [Mapping of stack to Kubernetes objects](./docs/mapping.md) - [Compatibility matrix](./docs/compatibility.md) # Get started Compose on Kubernetes comes installed on [Docker Desktop](https://www.docker.com/products/docker-desktop) and [Docker Enterprise](https://www.docker.com/products/docker-enterprise). On Docker Desktop you will need to activate Kubernetes in the settings to use Compose on Kubernetes. ## Check that Compose on Kubernetes is installed You can check that Compose on Kubernetes is installed by checking for the availability of the API using the command: ```console $ kubectl api-versions | grep compose compose.docker.com/v1beta1 compose.docker.com/v1beta2 ``` ## Deploy a stack To deploy a stack, you can use the Docker CLI: ```console $ cat docker-compose.yml version: '3.3' services: db: build: db image: dockersamples/k8s-wordsmith-db words: build: words image: dockersamples/k8s-wordsmith-api deploy: replicas: 5 web: build: web image: dockersamples/k8s-wordsmith-web ports: - "33000:80" $ docker stack deploy --orchestrator=kubernetes -c docker-compose.yml hellokube ``` # Developing Compose on Kubernetes See the [contributing](./CONTRIBUTING.md) guides for how to contribute code. ## Pre-requisites - `make` - [Docker Desktop](https://www.docker.com/products/docker-desktop) (Mac or Windows) with engine version 18.09 or later - Enable Buildkit by setting `DOCKER_BUILDKIT=1` in your environment - Enable Kubernetes in Docker Desktop settings ### For live debugging - Debugger capable of remote debugging with Delve API version 2 - Goland run-configs are pre-configured ## Debug quick start ### Debug install To build and install a debug version of Compose on Kubernetes onto Docker Desktop, you can use the following command: ```console $ make -f debug.Makefile install-debug-images ``` This command: - Builds the images with debug symbols - Runs the debug installer: - Installs debug versions of API server and Compose controller in the `docker` namespace - Creates two debugging _LoadBalancer_ services (unused in this mode) You can verify that Compose on Kubernetes is running with `kubectl` as follows: ```console $ kubectl get all -n docker NAME READY STATUS RESTARTS AGE pod/compose-7c4dfcff76-jgwst 1/1 Running 0 59s pod/compose-api-759f8dbb4b-2z5n2 2/2 Running 0 59s NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/compose-api ClusterIP 10.98.42.151 443/TCP 59s service/compose-api-server-remote-debug LoadBalancer 10.101.198.179 localhost 40001:31693/TCP 59s service/compose-controller-remote-debug LoadBalancer 10.101.158.160 localhost 40000:31167/TCP 59s NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE deployment.apps/compose 1 1 1 1 59s deployment.apps/compose-api 1 1 1 1 59s NAME DESIRED CURRENT READY AGE replicaset.apps/compose-7c4dfcff76 1 1 1 59s replicaset.apps/compose-api-759f8dbb4b 1 1 1 59s ``` If you describe one of the deployments, you should see `*-debug:latest` in the image name. ### Live debugging install To build and install a live debugging version of Compose on Kubernetes onto Docker Desktop, you can use the following command: ```console $ make -f debug.Makefile install-live-debug-images ``` This command: - Builds the images with debug symbols - Sets the image entrypoint to run a [Delve server](https://github.com/derekparker/delve) - Runs the debug installer - Installs debug version of API server and Compose controller in the `docker` namespace - Creates two debugging _LoadBalancer_ services - `localhost:40000`: Compose controller - `localhost:40001`: API server - The API server and Compose controller only start once a debugger is attached To attach a debugger you have multiple options: - Use [GoLand](https://www.jetbrains.com/go/): configuration can be found in `.idea` of the repository - Select the `Debug all` config, setup breakpoints and start the debugger - Set your Delve compatible debugger to point to use `locahost:40000` and `localhost:40001` - Using a terminal: `dlv connect localhost:40000` then type `continue` and hit enter To verify that the components are installed, you can use the following command: ```console $ kubectl get all -n docker ``` To verify that the API server has started, ensure that it has started logging: ```console $ kubectl logs -f -n docker deployment.apps/compose-api compose API server listening at: [::]:40000 ERROR: logging before flag.Parse: I1207 15:25:13.760739 11 plugins.go:158] Loaded 2 mutating admission controller(s) successfully in the following order: NamespaceLifecycle,MutatingAdmissionWebhook. ERROR: logging before flag.Parse: I1207 15:25:13.763211 11 plugins.go:161] Loaded 1 validating admission controller(s) successfully in the following order: ValidatingAdmissionWebhook. ERROR: logging before flag.Parse: W1207 15:25:13.767429 11 client_config.go:552] Neither --kubeconfig nor --master was specified. Using the inClusterConfig. This might not work. ERROR: logging before flag.Parse: W1207 15:25:13.851500 11 genericapiserver.go:319] Skipping API compose.docker.com/storage because it has no resources. ERROR: logging before flag.Parse: I1207 15:25:13.998154 11 serve.go:116] Serving securely on [::]:9443 ``` To verify that the Compose controller has started, ensure that it is logging: ```console kubectl logs -f -n docker deployment.apps/compose API server listening at: [::]:40000 Version: v0.4.16-dirty Git commit: b2e3a6b-dirty OS/Arch: linux/amd64 Built: Fri Dec 7 15:18:13 2018 time="2018-12-07T15:25:19Z" level=info msg="Controller ready" ``` ## Reinstall default To reinstall the default Compose on Kubernetes on Docker Desktop, simply restart your Kubernetes cluster. You can do this by deactivating and then reactivating Kubernetes or by restarting Docker Desktop. See the [contributing](./CONTRIBUTING.md) and [debugging](./DEBUGGING.md) guides. # Deploying Compose on Kubernetes - Guide for [Azure AKS](./docs/install-on-aks.md). - Guide for [GKE](./docs/install-on-gke.md). - Guide for [Microk8s](./docs/install-on-microk8s.md). - Guide for [Minikube](./docs/install-on-minikube.md).