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Compose on Kubernetes

Compose on Kubernetes

Introduction to Compose on Kubernetes for Docker Tokyo #27

Kunal Kushwaha

January 16, 2019

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  1. • Compose is a tool for defining and running multi-container

    Docker applications. • Services and dependencies are defined in YAML file to configure application. • Using single command, you create and start all the services from your configuration. • Also works with swarm. • Tool for developers. https://docs.docker.com/compose/ Diagram Credit : cloudacademy
  2. • Provides the flexibility to use a project name to

    isolate the environments from each other • Compose preserves all volumes used by the services defined in the compose file, thus no data is lost when the containers are recreated • Containers which have changed are recreated, the containers whose state did not change remain untouched • Support for variables in the compose file, we can define variables in a .env file and use them in the docker-compose file https://docs.docker.com/compose/
  3. $ docker-compose up -d $ docker-compose down $ docker-compose start

    $ docker-compose stop $ docker-compose build $ docker-compose logs -f <service> $ docker-compose scale <service>=4 $ docker-compose events $ docker-compose exec <service> bash Docker compose commands
  4. • The Kubernetes API is amazingly general purpose – it

    exposes low-level primitives for building the full range of distributed systems. • • There are more than 50 first-class objects in the latest release, from Pods and Deployments to ValidatingWebhookConfiguration and ResourceQuota etc • • This can lead to a verbosity in configuration, which then needs to be managed by you, the developer. kubernetes APIs Compose on Kubernetes • Compose meanwhile isn’t an API but a high-level tool focused on developer productivity • For the common case of a set of interconnected web services, Compose provides an abstraction that simplifies Kubernetes configuration • For everything else you can still drop down to the raw Kubernetes API primitives
  5. - Adds ‘stack’ object by extending kubernetes using API Aggregation.

    - As ‘stack’ object is native, can be integrated with other k8s tools like skaffold.
  6. $ git clone https://github.com/microservices-demo/microservices-demo.git $ cd deployment/kubernetes/manifests $ (Get-ChildItem -Recurse

    -File | Get-Content | Measure-Object -line).Lines 908 $ cd ../../docker-compose $ (Get-Content docker-compose.yml | Measure-Object -line).Lines 174 More than 5x code is reduced in compose as compared to raw k8s object description
  7. Docker Desktop (Windows/Mac) • Installed by default. Deploying Compose on

    Kubernetes • Guide for Azure AKS. • Guide for GKE • Guide for Minikube. Try compose-on-kubernetes !