From 3602c3b42eb3ee2788dd32527aac4ddc933eecaa Mon Sep 17 00:00:00 2001
From: Pavlos Tzianos <pavlos.tzianos@gmail.com>
Date: Mon, 29 Jan 2024 16:50:54 +0000
Subject: [PATCH] Add script for setting up KiND cluster

---
 scripts/kind-with-registry.sh | 77 +++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100755 scripts/kind-with-registry.sh

diff --git a/scripts/kind-with-registry.sh b/scripts/kind-with-registry.sh
new file mode 100755
index 000000000..404b8606c
--- /dev/null
+++ b/scripts/kind-with-registry.sh
@@ -0,0 +1,77 @@
+#!/bin/bash
+
+# based on the script from KiND docs
+
+set -o errexit
+
+reg_name='kind-registry'
+reg_port='5001'
+cluster_name='dracon-demo'
+
+source ./scripts/util.sh
+
+while getopts n:p:c: flag
+do
+    case "${flag}" in
+        u) reg_name=${OPTARG};;
+        p) reg_port=${OPTARG};;
+        c) cluster_name=${OPTARG};;
+        *) util::error "unknown flag ${flag}"; exit 1;;
+    esac
+done
+
+# 1. Create registry container unless it already exists
+if [ "$(docker inspect -f '{{.State.Running}}' ${reg_name} 2>/dev/null)" != "true" ]
+then
+  util::info "Spinning up container with Docker registry"
+  docker run --detach \
+            --restart=always \
+            --publish "127.0.0.1:${reg_port}:5000" \
+            --network bridge \
+            --name "${reg_name}" \
+            registry:2
+fi
+
+# 2. Create kind cluster with containerd registry config dir enabled
+if ! $(kind get clusters 2>&1 | grep "${cluster_name}")
+then
+  cat <<EOF | kind create cluster --name ${cluster_name} --config=-
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+containerdConfigPatches:
+- |-
+  [plugins."io.containerd.grpc.v1.cri".registry]
+    config_path = "/etc/containerd/certs.d"
+EOF
+
+  # 3. Add the registry config to the nodes
+  REGISTRY_DIR="/etc/containerd/certs.d/localhost:${reg_port}"
+  for node in $(kind get nodes --name "${cluster_name}"); do
+    docker exec "${node}" mkdir -p "${REGISTRY_DIR}"
+    cat <<EOF | docker exec -i "${node}" cp /dev/stdin "${REGISTRY_DIR}/hosts.toml"
+[host."http://${reg_name}:5000"]
+EOF
+  done
+
+  # 4. Connect the registry to the cluster network if not already connected
+  # This allows kind to bootstrap the network but ensures they're on the same network
+  if [ "$(docker inspect -f='{{json .NetworkSettings.Networks.kind}}' "${reg_name}")" = 'null' ]
+  then
+    util::info "Connecting KiND cluster container to the registry container"
+    docker network connect "kind" "${reg_name}"
+  fi
+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