Expose Kind docker daemon

kind-docker-proxy.yaml

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: docker-proxy
  namespace: kube-system
  labels:
    app: docker-proxy
spec:
  selector:
    matchLabels:
      app: docker-proxy
  template:
    metadata:
      labels:
        app: docker-proxy
    spec:
      containers:
        - image: alpine/socat
          name: docker-proxy
          args:
          - -d
          - -d
          - TCP-L:2375,fork
          - UNIX:/var/run/docker.sock
          resources:
            limits:
              cpu: 20m
              memory: 100Mi
            requests:
              cpu: 10m
              memory: 50Mi
          ports:
          - name: http
            containerPort: 2375
          volumeMounts:
          - name: docker-sock
            mountPath: /var/run/docker.sock
      volumes:
      - name: docker-sock
        hostPath:
          path: /var/run/docker.sock
---
apiVersion: v1
kind: Service
metadata:
  name: docker-proxy
  namespace: kube-system
  labels:
    app: docker-proxy
spec:
  ports:
    - port: 2375
      targetPort: 2375
      name: http
  selector:
    app: docker-proxy

kind-environment.sh

#!/bin/bash

set -e

if [ -z $KIND_CLUSTER ]; then
  echo "Please set KIND_CLUSTER in environment"
  exit 1
fi

if [ ! -f ~/.kube/kind-config-$KIND_CLUSTER ]; then
  echo "No Kind cluster found for name $KIND_CLUSTER"
  exit 1
fi

if [ ! -x $(which yq) ]; then
  echo "No yq installed, please `pip install yq`"
  exit 1
fi

mkdir -p ~/.kube/certs/kind-$KIND_CLUSTER
yq -r '.users[].user."client-certificate-data"' ~/.kube/kind-config-$KIND_CLUSTER | base64 --decode > ~/.kube/certs/kind-$KIND_CLUSTER/cert.pem
yq -r '.users[].user."client-key-data"' ~/.kube/kind-config-$KIND_CLUSTER | base64 --decode > ~/.kube/certs/kind-$KIND_CLUSTER/key.pem
yq -r '.clusters[].cluster."certificate-authority-data"' ~/.kube/kind-config-$KIND_CLUSTER | base64 --decode > ~/.kube/certs/kind-$KIND_CLUSTER/ca.pem

SERVER=$(yq -r '.clusters[].cluster.server' ~/.kube/kind-config-$KIND_CLUSTER | sed -e 's|https://||')

echo "# 'eval' the output of this script to set your environment to talk to your Kind cluster"
echo "# eval \$(KIND_CLUSTER=<cluster-name> ./kind-environment.sh)"
echo "export DOCKER_TLS_VERIFY=\"1\""
echo "export DOCKER_HOST=\"$SERVER/api/v1/namespaces/kube-system/services/docker-proxy:http/proxy\""
echo "export DOCKER_CERT_PATH=~/.kube/certs/kind-$KIND_CLUSTER"
echo "export KUBECONFIG=~/.kube/kind-config-$KIND_CLUSTER"

Steps to get a Kind cluster up and running and expose the Docker daemon to your local terminal:

1. Install Kind: go get sigs.k8s.io/kind
2. Create a cluster: kind create cluster --name <give-your-cluster-a-name>
3. Run the kind-environment.sh script: eval $(KIND_CLUSTER=<your_kind_cluster_name> ./kind-environment.sh)
4. Install the docker-proxy: kubectl apply -f kind-docker-proxy.yaml
5. Wait until the docker-proxy pod has started and then docker ps and you should be pointing at the docker daemon running within your Kind cluster