xk6-kubernetes

A k6 extension for interacting with Kubernetes clusters while testing.

Build

To build a custom k6 binary with this extension, first ensure you have the prerequisites:

• Go toolchain
• Git

1. Download xk6:

   go install go.k6.io/xk6/cmd/xk6@latest

2. Build the k6 binary:

   xk6 build --with github.com/grafana/xk6-kubernetes

   The xk6 build command creates a k6 binary that includes the xk6-kubernetes extension in your local folder. This k6 binary can now run a k6 test using xk6-kubernetes APIs.

Development

To make development a little smoother, use the Makefile in the root folder. The default target will format your code, run tests, and create a k6 binary with your local code rather than from GitHub.

git clone git@github.com:grafana/xk6-kubernetes.git
cd xk6-kubernetes
make

Using the k6 binary with xk6-kubernetes, run the k6 test as usual:

./k6 run k8s-test-script.js

Usage

The API assumes a kubeconfig configuration is available at any of the following default locations:

• at the location pointed by the KUBECONFIG environment variable
• at $HOME/.kube

APIs

Generic API

This API offers methods for creating, retrieving, listing and deleting resources of any of the supported kinds.

Method	Parameters	Description
apply	manifest string	creates a Kubernetes resource given a YAML manifest or updates it if already exists
create	spec object	creates a Kubernetes resource given its specification
delete	kind	removes the named resource
	name
	namespace
get	kind	returns the named resource
	name
	namespace
list	kind	returns a collection of resources of a given kind
	namespace
update	spec object	updates an existing resource

Examples

Creating a pod using a specification

import { Kubernetes } from 'k6/x/kubernetes';

const podSpec = {
    apiVersion: "v1",
    kind:       "Pod",
    metadata: {
        name:      "busybox",
        namespace: "testns"
    },
    spec: {
        containers: [
            {
                name:    "busybox",
                image:   "busybox",
                command: ["sh", "-c", "sleep 30"]
            }
        ]
    }
}

export default function () {
  const kubernetes = new Kubernetes();

  kubernetes.create(pod)

  const pods = kubernetes.list("Pod", "testns");

  console.log(`${pods.length} Pods found:`);
  pods.map(function(pod) {
    console.log(`  ${pod.metadata.name}`)
  });
}

Creating a job using a YAML manifest

import { Kubernetes } from 'k6/x/kubernetes';

const manifest = `
apiVersion: batch/v1
kind: Job
metadata:
  name: busybox
  namespace: testns
spec:
  template:
    spec:
      containers:
      - name: busybox
        image: busybox
        command: ["sleep", "300"]
    restartPolicy: Never
`

export default function () {
  const kubernetes = new Kubernetes();

  kubernetes.apply(manifest)

  const jobs = kubernetes.list("Job", "testns");

  console.log(`${jobs.length} Jobs found:`);
  pods.map(function(job) {
    console.log(`  ${job.metadata.name}`)
  });
}

Helpers

The xk6-kubernetes extension offers helpers to facilitate common tasks when setting up a tests. All helper functions work in a namespace to facilitate the development of tests segregated by namespace. The helpers are accessed using the following method:

Method	Parameters	Description
helpers	namespace	returns helpers that operate in the given namespace. If none is specified, "default" is used

The methods above return an object that implements the following helper functions:

Method	Parameters	Description
getExternalIP	service	returns the external IP of a service if any is assigned before timeout expires
	timeout in seconds
waitPodRunning	pod name	waits until the pod is in 'Running' state or the timeout expires. Returns a boolean indicating of the pod was ready or not. Throws an error if the pod is Failed.
	timeout in seconds
waitServiceReady	service name	waits until the given service has at least one endpoint ready or the timeout expires
	timeout in seconds

Examples

Creating a pod and wait until it is running

import { Kubernetes } from 'k6/x/kubernetes';

let podSpec = {
    apiVersion: "v1",
    kind:       "Pod",
    metadata: {
        name:      "busybox",
        namespace:  "default"
    },
    spec: {
        containers: [
            {
                name:    "busybox",
                image:   "busybox",
                command: ["sh", "-c", "sleep 30"]
            }
        ]
    }
}

export default function () {
  const kubernetes = new Kubernetes();

  // create pod
  kubernetes.create(pod)

  // get helpers for test namespace
  const helpers = kubernetes.helpers()

  // wait for pod to be running
  const timeout = 10
  if (!helpers.waitPodRunning(pod.metadata.name, timeout)) {
      console.log(`"pod ${pod.metadata.name} not ready after ${timeout} seconds`)
  }
}