Adding a helper script for a podman based kind cluster with an image …

…registry

Signed-off-by: Igor Troyanovsky <itroyano@redhat.com>

kind-with-registry-podman.sh

@@ -0,0 +1,68 @@
+#!/bin/sh
+set -o errexit
+
+# 1. Create registry container unless it already exists
+reg_name='kind-registry'
+reg_port='5001'
+if [ "$(podman inspect -f '{{.State.Running}}' "${reg_name}" 2>/dev/null || true)" != 'true' ]; then
+  podman run \
+    -d --restart=always -p "127.0.0.1:${reg_port}:5000" --network bridge --name "${reg_name}" \
+    registry:2
+fi
+
+# 2. Create kind cluster with containerd registry config dir enabled
+# TODO: kind will eventually enable this by default and this patch will
+# be unnecessary.
+#
+# See:
+# https://github.com/kubernetes-sigs/kind/issues/2875
+# https://github.com/containerd/containerd/blob/main/docs/cri/config.md#registry-configuration
+# See: https://github.com/containerd/containerd/blob/main/docs/hosts.md
+cat <<EOF | kind create cluster --config=-
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+featureGates:
+  "ValidatingAdmissionPolicy": true
+runtimeConfig:
+  "admissionregistration.k8s.io/v1beta1": true
+containerdConfigPatches:
+- |-
+  [plugins."io.containerd.grpc.v1.cri".registry]
+    config_path = "/etc/containerd/certs.d"
+EOF
+
+# 3. Add the registry config to the nodes
+#
+# This is necessary because localhost resolves to loopback addresses that are
+# network-namespace local.
+# In other words: localhost in the container is not localhost on the host.
+#
+# We want a consistent name that works from both ends, so we tell containerd to
+# alias localhost:${reg_port} to the registry container when pulling images
+REGISTRY_DIR="/etc/containerd/certs.d/localhost:${reg_port}"
+for node in $(kind get nodes); do
+  podman exec "${node}" mkdir -p "${REGISTRY_DIR}"
+  cat <<EOF | podman exec -i "${node}" cp /dev/stdin "${REGISTRY_DIR}/hosts.toml"
+[host."http://${reg_name}:5000"]
+EOF
+done
+
+# 4. Connect the registry to the cluster network if not already connected
+# This allows kind to bootstrap the network but ensures they're on the same network
+if [ "$(podman inspect -f='{{json .NetworkSettings.Networks.kind}}' "${reg_name}")" = 'null' ]; then
+  podman network connect "kind" "${reg_name}"
+fi
+
+# 5. Document the local registry
+# https://github.com/kubernetes/enhancements/tree/master/keps/sig-cluster-lifecycle/generic/1755-communicating-a-local-registry
+cat <<EOF | kubectl apply -f -
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: local-registry-hosting
+  namespace: kube-public
+data:
+  localRegistryHosting.v1: |
+    host: "localhost:${reg_port}"
+    help: "https://kind.sigs.k8s.io/docs/user/local-registry/"
+EOF