Docker In Docker with Builx and IPv6

Some times Docker in Docker is require for more organization or one time runs such as build container with Gitlab-ci. Regular dind is not support buildx and IPv6. This repository aim that these kind a problems.

This dind is require privileged mode.

To enable buildx, set env variable buildx is to yes.
If main docker is configured with IPv6, dind container has a IPv6 detection system and system try to find and set IPv6.
You can set IPv6 by manual with set ipv6 env variable to your IPv6 block

Before build command start docker service with /src/start-docker.sh

Example gitlab-ci.yml from some project.

docker-build:
    variables:
      buildx: "yes"
    image: ahmetozer/dind:latest
    stage: build
    before_script:
      - /src/start-docker.sh
      - docker login -u "ahmetozer" -p "$dhub"
    script:
      - docker buildx build --platform linux/amd64,linux/arm64,linux/arm --push -t ahmetozer/cors-proxy .
    only:
      - master

Overlay layer is more optimized for performance and disk space. So you can run your dind with mounting docker lib path to real ext4 path on disk.

#   Create directory for your dind containers
mkdir -p /dind/dind1

docker run -it --rm --privileged -v /dind/dind1:/var/lib/docker ahmetozer/dind

Example gitlab-runner config.

concurrent = 1
check_interval = 0

[session_server]
  session_timeout = 1800
  listen_address = "[::]:8093"

[[runners]]
  name = "dind1"
  url = "https://gitlab.com/"
  token = "My_SECRET_TOKEN"
  executor = "docker"
  [runners.custom_build_dir]
  [runners.cache]
    [runners.cache.s3]
    [runners.cache.gcs]
  [runners.docker]
    tls_verify = false
    image = "alpine:latest"
    privileged = true
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    volumes = ["/cache","/var/lib/docker/dind-overlay:/var/lib/docker:rw"]
    shm_size = 0