Cdk8s-operator NPM

cdk8s-operator

Create Kubernetes CRD Operators using CDK8s Constructs

This is a multi-language (jsii) library and a command-line tool that allows you to create Kubernetes operators for CRDs (Custom Resource Definitions) using CDK8s.

Getting Started

Let's create our first CRD served by a CDK8s construct using TypeScript.

Install CDK8s

Make sure your system has the required CDK8s prerequisites.

Install the CDK8s CLI globally through npm:

$ npm i -g cdk8s-cli
Installing...

# Verify installation
$ cdk8s --version
1.0.0-beta.3

Create a new CDK8s app

Now, let's create a new CDK8s typescript app:

mkdir hello-operator && cd hello-operator
git init
cdk8s init typescript-app

Install cdk8s-operator

Next, let's install this module as a dependency of our TypeScript project:

npm install cdk8s-operator

Construct

We will start by creating the construct that implements the abstraction. This is is just a normal CDK8s custom construct:

Let's create a construct called PodCollection which represents a collection of pods:

pod-collection.ts:

import { Pod } from 'cdk8s-plus-17';
import { Construct } from 'constructs';

export interface PodCollectionProps {
  /** Number of pods */
  readonly count: number;
  /** The docker image to deploy */
  readonly image: string;
}

export class PodCollection extends Construct {
  constructor(scope: Construct, id: string, props: PodCollectionProps) {
    super(scope, id);

    for (let i = 0; i < props.count; ++i) {
      new Pod(this, `pod-${i}`, {
        containers: [ { image: props.image } ]
      });
    }
  }
}

Operator App

Now, we will need to replace out main.ts file with an "operator app", which is a special kind of CDK8s app designed to be executed by the cdk8s-server CLI which is included in this module.

The Operator app construct can be used to create "CDK8s Operators" which are CDK8s apps that accept input from a file (or STDIN) with a Kubernetes manifest, instantiates a construct with the spec as its input and emits the resulting manifest to STDOUT.

Replace the contents of main.ts with the following. We initialize an Operator app and then register a provider which handles resources of API version samples.cdk8s.org/v1alpha1 and kind PodCollection.

main.ts:

import { Operator } from 'cdk8s-operator';
import { PodCollection } from './pod-collection';

const app = new Operator();

app.addProvider({
  apiVersion: 'samples.cdk8s.org/v1alpha1',
  kind: 'PodCollection',
  handler: {
    apply: (scope, id, props) => new PodCollection(scope, id, props)
  }
})

app.synth();

A single operator can handle any number of resource kinds. Simply call addProvider() for each apiVersion/kind.

Using Operators

To use this operator, create an input.json file, e.g:

input.json:

{
  "apiVersion": "samples.cdk8s.org/v1alpha1",
  "kind": "PodCollection",
  "metadata": {
    "name": "my-collection"
  },
  "spec": {
    "image": "paulbouwer/hello-kubernetes",
    "count": 5
  }
}

Compile your code:

# delete `main.test.ts` since it has some code that won't compile
$ rm -f main.test.*

# compile
$ npm run compile

And run:

$ node main.js input.json

apiVersion: "v1"
kind: "Pod"
metadata:
  name: "my-collection-pod-0-c8735c52"
spec:
  containers:
    - env: []
      image: "paulbouwer/hello-kubernetes"
      imagePullPolicy: "Always"
      name: "main"
      ports: []
      volumeMounts: []
  volumes: []
---
apiVersion: "v1"
kind: "Pod"
metadata:
  name: "my-collection-pod-1-c89f58d7"
spec:
  containers:
    - env: []
      image: "paulbouwer/hello-kubernetes"
      imagePullPolicy: "Always"
      name: "main"
      ports: []
      volumeMounts: []
  volumes: []
---
apiVersion: "v1"
kind: "Pod"
metadata:
  name: "my-collection-pod-2-c88d4268"
spec:
  containers:
    - env: []
      image: "paulbouwer/hello-kubernetes"
      imagePullPolicy: "Always"
      name: "main"
      ports: []
      volumeMounts: []
  volumes: []
---
apiVersion: "v1"
kind: "Pod"
metadata:
  name: "my-collection-pod-3-c86866b1"
spec:
  containers:
    - env: []
      image: "paulbouwer/hello-kubernetes"
      imagePullPolicy: "Always"
      name: "main"
      ports: []
      volumeMounts: []
  volumes: []
---
apiVersion: "v1"
kind: "Pod"
metadata:
  name: "my-collection-pod-4-c8b74b1d"
spec:
  containers:
    - env: []
      image: "paulbouwer/hello-kubernetes"
      imagePullPolicy: "Always"
      name: "main"
      ports: []
      volumeMounts: []
  volumes: []

`cdk8s-server`

This library is shipped with a program called cdk8s-server which can be used to host your operator inside an HTTP server. This server can be used as a sidecar container with a generic CRD operator (TBD).

$ PORT=8080 npx cdk8s-server
Listening on 8080
- App command: node main.js
- Request body should include a single k8s resource in JSON format
- Request will be piped through STDIN to "node main.js"
- Response is the STDOUT and expected to be a multi-resource yaml manifest

Now, you can send input.json over HTTP:

$ curl -d @input.json http://localhost:8080
MANIFEST...

License

Apache 2.0

cdk8s crd kubernetes operator

yaml

@infinitebrahmanuniverse/nolb-cdk @everything-registry/sub-chunk-1303 @zalastax/nolb-cdk

4 days ago

26 days ago

2 months ago

2 months ago

2 months ago

2 months ago

3 months ago

4 months ago

5 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

8 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

8 months ago

8 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

7 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

9 months ago

10 months ago

10 months ago

10 months ago

9 months ago

10 months ago

9 months ago

10 months ago

10 months ago

10 months ago

10 months ago

6 months ago

6 months ago

6 months ago

6 months ago

6 months ago

6 months ago

7 months ago

7 months ago

6 months ago

7 months ago

6 months ago

6 months ago

6 months ago

5 months ago

6 months ago

6 months ago

6 months ago

6 months ago

6 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

11 months ago

11 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

10 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

12 months ago

11 months ago

11 months ago

12 months ago

12 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

11 months ago

12 months ago

12 months ago

12 months ago

12 months ago

12 months ago

1 year ago

1 year ago

12 months ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

2 years ago

2 years ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

1 year ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

2 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago

3 years ago