Gitlab Docker Layer Caching for Kubernetes Executor

docker-dind.pvc.yaml

## PVC for storing dind data
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  labels:
    app: docker-dind
  name: docker-dind-data
  namespace: gitlab-managed-apps
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 100Gi

docker-dind.svc.yaml

## Service for exposing docker-dind
apiVersion: v1
kind: Service
metadata:
  labels:
    app: docker-dind
  name: docker-dind
  namespace: gitlab-managed-apps
spec:
  ports:
    - port: 2375
      protocol: TCP
      targetPort: 2375
  selector:
    app: docker-dind

docker-dind.yaml

## Deployment for docker-dind
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: docker-dind
  name: docker-dind
  namespace: gitlab-managed-apps
spec:
  replicas: 1
  selector:
    matchLabels:
      app: docker-dind
  template:
    metadata:
      labels:
        app: docker-dind
    spec:
      containers:
        - image: docker:19.03-dind
          name: docker-dind
          env:
            - name: DOCKER_HOST
              value: tcp://0.0.0.0:2375
            - name: DOCKER_TLS_CERTDIR #Disable TLS as traffic is not going outside of network.
              value: ""
          volumeMounts:
            - name: docker-dind-data-vol #Persisting the docker data
              mountPath: /var/lib/docker/
          ports:
            - name: daemon-port
              containerPort: 2375
              protocol: TCP
          securityContext:
            privileged: true #Required for dind container to work.
      volumes:
        - name: docker-dind-data-vol
          persistentVolumeClaim:
            claimName: docker-dind-data