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Higher-Order Deployments

Reducing Boilerplate With Kubernetes Custom Resource Definitions

@jrbowes

April 18, 2018

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@jrbowes

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a puppet

(also a chef)

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@jrbowes

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Y

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@jrbowes

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CUSTOM

RESOURCE

DEFINITIONS.

CONTROLLERS.

ADMISSION

CONTROLLERS.

JAVASCRIPT?

@jrbowes

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https://www.manifold.co

YES, WE

ARE HIRING

SIGN UP

TODAY

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@jrbowes

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By Frank Vincentz (Own work) GFDL via Wikimedia Commons

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apiVersion: extensions/v1beta1

kind: Deployment

metadata:

name: worker

spec:

replicas: 2

strategy:

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@jrbowes

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@jrbowes

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@jrbowes

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Kubernetes is

Composition

@jrbowes

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Kubernetes is

a Database

@jrbowes

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  • 1 Custom Resource Definition
  • 1 Controller
  • Admission Controllers to taste

@jrbowes

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apiVersion: apiextensions.k8s.io/v1beta1

kind: CustomResourceDefinition

metadata:

name: applications.manifold.co

spec:

group: stable.manifold.co

version: v1

scope: Namespaced

names:

plural: applications

singular: application

kind: Application

​

@jrbowes

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validation:

openAPIV3Schema:

properties:

spec:

properties:

replicas:

type: integer

minimum: 2

image:

type: string

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@jrbowes

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Start with

Metacontroller

@jrbowes

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@jrbowes

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Why?

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@jrbowes

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@jrbowes

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@jrbowes

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- name: Create my app's deployment

k8s_raw:

state: present

definition:

apiVersion: extensions/v1beta1

kind: Deployment

metadata:

name: my-app

spec:

replicas: 2

​

- name: Create all of my app

k8s_raw:

state: present

definition:

apiVersion: manifold.co/v1

kind: Application

metadata:

name: my-app

spec:

external: true

​

@jrbowes

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  • CRDs are new & incomplete
    • No multi-version support yet

​

  • Many moving parts
    • Definition and controller

​

  • Attempts to simplify are still early
    • Metacontroller
    • Kubekit
    • Your cool project?

@jrbowes

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Thank you!

@jrbowes

April 18, 2018