Compose on Kubernetes

Introduction to Compose on Kubernetes for Docker Tokyo #27

Transcript

1. Compose on Kubernetes
   Kunal Kushwaha
   @kunalkushwaha
   NTT OSSC
   

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2. What is compose?
   

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3. ● 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
   

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4. Why compose?
   

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5. ● 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/
   

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6. $ docker-compose up -d
   $ docker-compose down
   $ docker-compose start
   $ docker-compose stop
   $ docker-compose build
   $ docker-compose logs -f
   $ docker-compose scale =4
   $ docker-compose events
   $ docker-compose exec bash
   Docker compose commands
   

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7. Why Compose on Kubernetes?
   

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8. ● 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
   

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9. Architecture & Implementation
   

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10. - Adds ‘stack’ object by extending kubernetes using API Aggregation.
    - As ‘stack’ object is native, can be integrated with other k8s tools like skaffold.
    

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11. Efficiency of Compose?
    

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12. $ 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
    

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13. 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 !
    

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14. Demo
    

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15. Thanks
    ありがとう
    

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