Makefile, contrib: Add script to create kind cluster

Makefile

@@ -496,6 +496,9 @@ microk8s: check-microk8s ## Build cilium-dev docker image and import to mircrok8
 	$(QUIET)$(CONTAINER_ENGINE) tag $(IMAGE_REPOSITORY)/cilium-dev:$(LOCAL_IMAGE_TAG) $(LOCAL_IMAGE)
 	$(QUIET)./contrib/scripts/microk8s-import.sh $(LOCAL_IMAGE)
 
+kind: ## Create a kind cluster for Cilium development.
+	$(QUIET)./contrib/scripts/kind.sh
+
 precheck: logging-subsys-field ## Peform build precheck for the source code.
 ifeq ($(SKIP_K8S_CODE_GEN_CHECK),"false")
 	@$(ECHO_CHECK) contrib/scripts/check-k8s-code-gen.sh

contrib/scripts/kind.sh

@@ -0,0 +1,107 @@
+#!/usr/bin/env bash
+
+# Source: https://kind.sigs.k8s.io/docs/user/local-registry/
+
+set -euo pipefail
+
+default_controlplanes=1
+default_workers=1
+default_cluster_name=""
+default_image=""
+
+PROG=${0}
+CONTROLPLANES="${1:-${default_controlplanes}}"
+WORKERS="${2:-${default_workers}}"
+CLUSTER_NAME="${3:-${default_cluster_name}}"
+# IMAGE controls the K8s version as well (e.g. kindest/node:v1.11.10)
+IMAGE="${4:-${default_image}}"
+
+usage() {
+  echo "Usage: ${PROG} [control-plane node count] [worker node count] [cluster-name] [node image]"
+}
+
+have_kind() {
+    [[ -n "$(command -v kind)" ]]
+}
+
+if ! have_kind; then
+    echo "Please install kind first:"
+    echo "  https://kind.sigs.k8s.io/docs/user/quick-start/#installation"
+fi
+
+if [[ "${#}" -gt 4 ]]; then
+  usage
+  exit 1
+fi
+
+if [[ "${#}" -gt 4 ]] ||
+   [[ "${CONTROLPLANES}" == "-h" ||
+      "${CONTROLPLANES}" == "--help" ]]; then
+  usage
+  exit 0
+fi
+
+# Registry will be localhost:5000
+reg_name="kind-registry"
+reg_port="5000"
+running="$(docker inspect -f '{{.State.Running}}' "${reg_name}" 2>/dev/null || true)"
+if [[ "${running}" != "true" ]]; then
+  docker run \
+    -d --restart=always -p "${reg_port}:5000" --name "${reg_name}" \
+    registry:2
+fi
+
+kind_cmd="kind create cluster"
+
+if [[ -n "${CLUSTER_NAME}" ]]; then
+  kind_cmd+=" --name ${CLUSTER_NAME}"
+fi
+if [[ -n "${IMAGE}" ]]; then
+  kind_cmd+=" --image ${IMAGE}"
+fi
+
+control_planes() {
+  line="- role: control-plane"
+
+  for _ in $(seq 1 "${CONTROLPLANES}"); do
+    echo "$line"
+  done
+}
+
+workers() {
+  line="- role: worker"
+
+  for _ in $(seq 1 "${WORKERS}"); do
+    echo "$line"
+  done
+}
+
+# create a cluster with the local registry enabled in containerd
+cat <<EOF | ${kind_cmd} --config=-
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+$(control_planes)
+$(workers)
+networking:
+  disableDefaultCNI: true
+containerdConfigPatches:
+- |-
+  [plugins."io.containerd.grpc.v1.cri".registry.mirrors."localhost:${reg_port}"]
+    endpoint = ["http://${reg_name}:${reg_port}"]
+EOF
+
+docker network connect "kind" "${reg_name}" || true
+
+for node in $(kind get nodes); do
+  kubectl annotate node "${node}" "kind.x-k8s.io/registry=localhost:${reg_port}";
+done
+
+set +e
+kubectl taint nodes --all node-role.kubernetes.io/master-
+set -e
+
+echo
+echo "Images are pushed into the kind registry like so:"
+echo "  export DOCKER_REGISTRY=localhost:5000"
+echo "  make dev-docker-image"