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create-kind-cluster.sh
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create-kind-cluster.sh
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#!/bin/sh
set -o errexit
# 1. Create registry container unless it already exists
reg_name='kind-registry'
reg_port='5000'
if [ "$(docker inspect -f '{{.State.Running}}' "${reg_name}" 2>/dev/null || true)" != 'true' ]; then
docker 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
name: capi-test
containerdConfigPatches:
- |-
[plugins."io.containerd.grpc.v1.cri".registry]
config_path = "/etc/containerd/certs.d"
nodes:
- role: control-plane
extraMounts:
- hostPath: /var/run/docker.sock
containerPath: /var/run/docker.sock
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 $(kind get nodes --name capi-test); do
docker exec "${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
docker 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