dockerfiles/dind/daemon.json

{
    "experimental": true,
    "debug": true,
    "log-level": "info",
    "registry-mirrors": ["https://mirror.gcr.io"],
    "insecure-registries": [
        "127.0.0.1"
    ],
    "hosts": [
        "unix:///var/run/docker.sock",
        "tcp://0.0.0.0:2375"
    ],
    "tls": DOCKER_TLSENABLE,
    "tlscacert": "DOCKER_TLSCACERT",
    "tlscert": "DOCKER_TLSCERT",
    "tlskey": "DOCKER_TLSKEY"
}