├── .circleci ├── Dockerfile ├── README.md ├── config.yml ├── portforward.sh ├── start-portforward-service.sh └── with-kind-cluster.sh ├── LICENSE ├── README.md ├── kind-with-registry.sh ├── teardown-kind-with-registry.sh └── test ├── pod.yaml └── test.sh /.circleci/Dockerfile: -------------------------------------------------------------------------------- 1 | FROM debian:buster 2 | 3 | RUN apt update 4 | RUN apt install -y curl ca-certificates liblz4-tool rsync socat 5 | 6 | # Install docker 7 | # Adapted from https://github.com/circleci/circleci-images/blob/staging/shared/images/Dockerfile-basic.template 8 | # Check https://download.docker.com/linux/static/stable/x86_64/ for latest versions 9 | ENV DOCKER_VERSION=19.03.5 10 | RUN set -exu \ 11 | && DOCKER_URL="https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz" \ 12 | && echo Docker URL: $DOCKER_URL \ 13 | && curl --silent --show-error --location --fail --retry 3 --output /tmp/docker.tgz "${DOCKER_URL}" \ 14 | && ls -lha /tmp/docker.tgz \ 15 | && tar -xz -C /tmp -f /tmp/docker.tgz \ 16 | && mv /tmp/docker/* /usr/bin \ 17 | && rm -rf /tmp/docker /tmp/docker.tgz \ 18 | && which docker \ 19 | && (docker version || true) 20 | 21 | # Install kubectl client 22 | RUN apt install -y apt-transport-https gnupg \ 23 | && curl -fsS https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - \ 24 | && touch /etc/apt/sources.list.d/kubernetes.list \ 25 | && echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" | tee -a /etc/apt/sources.list.d/kubernetes.list \ 26 | && apt update && apt install -y kubectl 27 | 28 | # install Kind 29 | ENV KIND_VERSION=v0.10.0 30 | RUN set -exu \ 31 | && curl -fLo ./kind-linux-amd64 "https://github.com/kubernetes-sigs/kind/releases/download/${KIND_VERSION}/kind-linux-amd64" \ 32 | && chmod +x ./kind-linux-amd64 \ 33 | && mv ./kind-linux-amd64 /usr/local/bin/kind 34 | 35 | # Install the script for portforwarding connections from the remote cluster 36 | ADD start-portforward-service.sh /usr/local/bin/start-portforward-service.sh 37 | ADD portforward.sh /usr/local/bin/portforward.sh 38 | ADD with-kind-cluster.sh /usr/local/bin/with-kind-cluster.sh 39 | -------------------------------------------------------------------------------- /.circleci/README.md: -------------------------------------------------------------------------------- 1 | # Kind on CircleCI with Remote Docker 2 | 3 | This config demonstrates how to run Kind 4 | with a local registry on CircleCI. 5 | 6 | ## Why is it hard to run Kind on CircleCI? 7 | 8 | CircleCI doesn't run Docker the same way you run Docker on your 9 | local computer. 10 | 11 | Instead, CircleCI creates a [remote environment](https://circleci.com/docs/2.0/building-docker-images/) 12 | and runs Docker there. 13 | 14 | This means that when you run Kind, you need to make sure 15 | that whenever you want to talk to the Kind cluster, 16 | you're talking to the remote docker, not to localhost. 17 | 18 | ## How do I use it? 19 | 20 | Create a circleci job that looks like this: 21 | 22 | ``` 23 | version: 2.1 24 | jobs: 25 | build: 26 | docker: 27 | - image: tiltdev/circleci-kind:v1.4.0 28 | 29 | steps: 30 | - setup_remote_docker 31 | - checkout 32 | - run: with-kind-cluster.sh [YOUR TEST COMMAND] 33 | ``` 34 | 35 | The `circleci-kind` image has all the tools you need to set up 36 | and talk to the cluster. You can build on this image with: 37 | 38 | ``` 39 | FROM tiltdev/circleci-kind:v1.4.0 40 | ``` 41 | 42 | Or copy out the helper scripts: 43 | 44 | ``` 45 | COPY --from=tiltdev/circleci-kind:v1.4.0 /usr/local/bin/start-portforward-service.sh /usr/local/bin/ 46 | COPY --from=tiltdev/circleci-kind:v1.4.0 /usr/local/bin/portforward.sh /usr/local/bin/ 47 | COPY --from=tiltdev/circleci-kind:v1.4.0 /usr/local/bin/with-kind-cluster.sh /usr/local/bin/ 48 | ``` 49 | 50 | See [Dockerfile](Dockerfile) for instructions on how to add these tools to 51 | your own docker image. 52 | 53 | ## How does it work? 54 | 55 | There are five steps 56 | 57 | 1) Create a port-forward service on the remote machine 58 | that knows how to forward connections. 59 | 60 | 2) Create an image registry. 61 | 62 | 3) Create a Kind cluster connected to the image registry. 63 | 64 | 4) Tell the port-forward service to connect the image registry to localhost. 65 | 66 | 5) Tell the port-forward service to connect the Kind cluster to localhost. 67 | -------------------------------------------------------------------------------- /.circleci/config.yml: -------------------------------------------------------------------------------- 1 | version: 2.1 2 | jobs: 3 | build: 4 | docker: 5 | - image: tiltdev/circleci-kind:v1.4.0 6 | 7 | steps: 8 | - setup_remote_docker 9 | - checkout 10 | - run: with-kind-cluster.sh test/test.sh 11 | -------------------------------------------------------------------------------- /.circleci/portforward.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # 3 | # Sets up portforwarding for the specified port. 4 | # 5 | # Usage: 6 | # start-portforward-service.sh 7 | # portforward.sh [port] 8 | # 9 | # Adapted from 10 | # https://github.com/kubernetes-retired/kubeadm-dind-cluster/blob/master/build/portforward.sh 11 | # 12 | # Copyright 2020 The Kubernetes Project 13 | # 14 | # Licensed under the Apache License, Version 2.0 (the "License"); 15 | # you may not use this file except in compliance with the License. 16 | # You may obtain a copy of the License at 17 | # 18 | # http://www.apache.org/licenses/LICENSE-2.0 19 | # 20 | # Unless required by applicable law or agreed to in writing, software 21 | # distributed under the License is distributed on an "AS IS" BASIS, 22 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 23 | # See the License for the specific language governing permissions and 24 | # limitations under the License. 25 | 26 | port="${1}" 27 | if [[ "$port" == "" ]]; then 28 | echo "Must specify a port" 29 | exit 1 30 | fi 31 | 32 | mode="" 33 | localhost="localhost" 34 | if [[ "${IP_MODE:-ipv4}" = "ipv6" ]]; then 35 | mode="6" 36 | localhost="[::1]" 37 | fi 38 | 39 | socat "TCP-LISTEN:${port},reuseaddr,fork" \ 40 | EXEC:"'docker exec -i portforward socat STDIO TCP${mode}:${localhost}:${port}'" & 41 | 42 | # Wait for a successful connection. 43 | for ((n = 0; n < 20; n++)); do 44 | if socat - "TCP${mode}:localhost:${port}" initializing Docker registry" 35 | 36 | # create registry container unless it already exists 37 | running="$(docker inspect -f '{{.State.Running}}' "${reg_name}" 2>/dev/null || true)" 38 | if [ "${running}" != 'true' ]; then 39 | docker run \ 40 | -d --restart=always -p "${reg_port}:5000" --name "${reg_name}" \ 41 | registry:2 42 | fi 43 | 44 | echo "> initializing Kind cluster: ${KIND_CLUSTER_NAME} with registry ${reg_name}" 45 | 46 | # create a cluster with the local registry enabled in containerd 47 | cat < port-forwarding k8s API server" 59 | /usr/local/bin/start-portforward-service.sh start 60 | 61 | APISERVER_PORT=$(kubectl config view -o jsonpath='{.clusters[].cluster.server}' | cut -d: -f 3 -) 62 | /usr/local/bin/portforward.sh $APISERVER_PORT 63 | kubectl get nodes # make sure it worked 64 | 65 | echo "> port-forwarding local registry" 66 | /usr/local/bin/portforward.sh $reg_port 67 | 68 | echo "> applying local-registry docs" 69 | 70 | cat < waiting for kubernetes node(s) become ready" 83 | kubectl wait --for=condition=ready node --all --timeout=60s 84 | 85 | echo "> with-kind-cluster.sh setup complete! 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The text should be enclosed in the appropriate 184 | comment syntax for the file format. We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # kind-local 2 | 3 | When using Tilt with a [Kind](https://github.com/kubernetes-sigs/kind) cluster, 4 | we recommend using a local registry for faster image pushing and pulling. 5 | 6 | This repo documents the best way to set Kind up. 7 | 8 | ## UPDATE(2023-09-15) 9 | 10 | The Kind project maintains an official script for setting up a local registry. The official script 11 | is kept up to date with the latest containerd settings. 12 | 13 | https://kind.sigs.k8s.io/docs/user/local-registry/ 14 | 15 | For a more comprehensive tool for setting up local clusters and registries, check out [ctlptl](http://github.com/tilt-dev/ctlptl). 16 | 17 | `ctlptl` uses many of the techniques in the official shell script, but with more features and better error-reporting. 18 | 19 | Therefore, this repo is obsolete, but will be archived for posterity. 20 | 21 | ## Why use Kind with a local registry? 22 | 23 | When developing locally, you want to push images to the cluster as fast as possible. 24 | 25 | Pushing to an in-cluster image registry skips a lot of overhead: 26 | 27 | - Unlike with a remote registry, the image stays local to your machine, with no network traffic 28 | 29 | - Unlike with `kind load`, docker will skip pushing any layers that already exist in the registry 30 | 31 | This makes it a great solution for iterative local development. But setting it up is awkward and fiddly. This script makes it easy. 32 | 33 | ## How to Try It 34 | 35 | 1) Install [Kind](https://github.com/kubernetes-sigs/kind) 36 | 37 | 2) Copy the [kind-with-registry.sh](kind-with-registry.sh) somewhere on your path. 38 | 39 | 3) Create a cluster with `kind-with-registry.sh`. Currently it creates the registry at port 5000. 40 | 41 | ``` 42 | kind-with-registry.sh 43 | ``` 44 | 45 | 4) Try pushing an image. 46 | 47 | ``` 48 | docker tag alpine localhost:5000/alpine 49 | docker push localhost:5000/alpine 50 | ``` 51 | 52 | You can now use the image name `localhost:5000/alpine` in any resources you deploy to the Kind cluster. 53 | 54 | [Tilt](https://tilt.dev) will automatically detect the local registry created by this script, 55 | and do the image tagging dance (as of Tilt v0.12.0). 56 | 57 | ## How to Use it in CI 58 | 59 | We also have instructions for setting Kind up with a local registry in 60 | 61 | - [.circleci](.circleci) 62 | 63 | ## Thanks to 64 | 65 | High five to [MicroK8s](https://github.com/ubuntu/microk8s) for the initial local registry feature 66 | that inspired a lot of this work. 67 | 68 | The Kind team ran with this, writing up documentation and hooks for how to [set up a local registry](https://kind.sigs.k8s.io/docs/user/local-registry/) with Kind. 69 | 70 | This repo modifies the Kind team's script to apply the local registry configmap, so that tools 71 | like Tilt can discover the local-registry. This protocol is a [Kubernetes Enhancement Proposal](https://github.com/kubernetes/enhancements/issues/1755). 72 | 73 | Tested on Kind 0.7.0 and Kind 0.8.0 74 | 75 | ## License 76 | 77 | Copyright 2019 Windmill Engineering 78 | 79 | Licensed under [the Apache License, Version 2.0](LICENSE) 80 | -------------------------------------------------------------------------------- /kind-with-registry.sh: -------------------------------------------------------------------------------- 1 | #!/bin/sh 2 | # 3 | # Adapted from: 4 | # https://github.com/kubernetes-sigs/kind/commits/master/site/static/examples/kind-with-registry.sh 5 | # 6 | # Copyright 2020 The Kubernetes Project 7 | # 8 | # Licensed under the Apache License, Version 2.0 (the "License"); 9 | # you may not use this file except in compliance with the License. 10 | # You may obtain a copy of the License at 11 | # 12 | # http://www.apache.org/licenses/LICENSE-2.0 13 | # 14 | # Unless required by applicable law or agreed to in writing, software 15 | # distributed under the License is distributed on an "AS IS" BASIS, 16 | # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 | # See the License for the specific language governing permissions and 18 | # limitations under the License. 19 | 20 | set -o errexit 21 | 22 | # desired cluster name; default is "kind" 23 | KIND_CLUSTER_NAME="${KIND_CLUSTER_NAME:-kind}" 24 | KIND_CLUSTER_OPTS="--name ${KIND_CLUSTER_NAME}" 25 | 26 | if [ -n "${KIND_CLUSTER_IMAGE}" ]; then 27 | KIND_CLUSTER_OPTS="${KIND_CLUSTER_OPTS} --image ${KIND_CLUSTER_IMAGE}" 28 | fi 29 | 30 | kind_version=$(kind version) 31 | kind_network='kind' 32 | reg_name='kind-registry' 33 | reg_port='5000' 34 | case "${kind_version}" in 35 | "kind v0.7."* | "kind v0.6."* | "kind v0.5."*) 36 | kind_network='bridge' 37 | ;; 38 | esac 39 | 40 | # create registry container unless it already exists 41 | running="$(docker inspect -f '{{.State.Running}}' "${reg_name}" 2>/dev/null || true)" 42 | if [ "${running}" != 'true' ]; then 43 | docker run \ 44 | -d --restart=always -p "${reg_port}:5000" --name "${reg_name}" \ 45 | registry:2 46 | fi 47 | 48 | reg_host="${reg_name}" 49 | if [ "${kind_network}" = "bridge" ]; then 50 | reg_host="$(docker inspect -f '{{.NetworkSettings.IPAddress}}' "${reg_name}")" 51 | fi 52 | echo "Registry Host: ${reg_host}" 53 | 54 | # create a cluster with the local registry enabled in containerd 55 | cat </dev/null || true)" 32 | if [ "${running}" == 'true' ]; then 33 | cid="$(docker inspect -f '{{.ID}}' "${reg_name}")" 34 | echo "> Stopping and deleting Kind Registry container..." 35 | docker stop $cid >/dev/null 36 | docker rm $cid >/dev/null 37 | fi 38 | 39 | echo "> Deleting Kind cluster..." 40 | kind delete cluster --name=$KIND_CLUSTER_NAME 41 | -------------------------------------------------------------------------------- /test/pod.yaml: -------------------------------------------------------------------------------- 1 | apiVersion: v1 2 | kind: Pod 3 | metadata: 4 | name: kind-test 5 | labels: 6 | app: kind-test 7 | spec: 8 | containers: 9 | - name: kind-test 10 | image: localhost:5000/busybox 11 | command: ["sh", "-c", "busybox httpd -f -p 8000"] 12 | ports: 13 | - containerPort: 8000 14 | -------------------------------------------------------------------------------- /test/test.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # 3 | # Make sure the Kind local registry works as expected. 4 | 5 | set -ex 6 | 7 | cd $(dirname $0) 8 | 9 | docker pull busybox 10 | docker tag busybox localhost:5000/busybox 11 | docker push localhost:5000/busybox 12 | kubectl delete -f pod.yaml --ignore-not-found 13 | kubectl create -f pod.yaml 14 | kubectl wait --for=condition=ready pod/kind-test --timeout=60s 15 | --------------------------------------------------------------------------------