Antonio Ojea aojea

KIND development workflow

Create your kind cluster (suit yourself https://kind.sigs.k8s.io/docs/user/configuration/)

cat <<EOF | kind create cluster --config=-
kind: Cluster
apiVersion: kind.x-k8s.io/v1alpha4
nodes:
- role: control-plane

How to repro

Deploy a service with endpoints using hostNetwork: true

kubectl apply -f https://gist.githubusercontent.com/aojea/ee37cc43f2513afbf5918c7ffddd807d/raw/b01b800b333539044d9c81eab232edab9fd5718a/svc-hostnet.yml

Create an UDP service too, using that deployment

Run a container to probe the service:

Networking scenarios [Linux Only]

KIND runs Kubernetes cluster in Docker, and leverages Docker networking for all the network features: port mapping, IPv6, containers connectivity, etc.

Docker Networking

KIND uses a docker user defined network.

It creates a bridge named kind

KIND network emulation

Configuration parameters

Network bandwidth rate
Network latency
Packet loss rate


	cd $GOPATH/src/k8s.io/kubernetes

	make WHAT="test/e2e/e2e.test vendor/github.com/onsi/ginkgo/ginkgo"

	# export KUBECONFIG=${HOME}/kind.conf
	export GINKGO_PARALLEL=y
	export KUBERNETES_CONFORMANCE_TEST='y'
	export KUBE_CONTAINER_RUNTIME=remote

	# three node (two workers) cluster config
	kind: Cluster
	apiVersion: kind.x-k8s.io/v1alpha4
	networking:
	serviceSubnet: 10.96.0.0/16
	ipFamily: ipv4
	nodes:
	- role: control-plane
	- role: worker
	- role: worker

	apiVersion: v1
	kind: Pod
	metadata:
	creationTimestamp: null
	labels:
	component: etcdclient
	tier: debug
	name: etcdclient
	namespace: default
	spec:

	apiVersion: apps/v1
	kind: Deployment
	metadata:
	name: hostnet-deployment
	labels:
	app: MyApp
	spec:
	replicas: 3
	selector:
	matchLabels:

	ARG IMAGE=kindest/node
	ARG VERSION=1.19
	ARG MINOR=1
	ARG OS=xUbuntu_20.04

	FROM ${IMAGE}:v${VERSION}.${MINOR}

	ARG VERSION
	ARG OS