README.md

concourse-dind

Based on the official docker dind image, but using a modified version of the concourse/docker-image-resource helper scripts to make dind working in Concourse.

Container startup explained

• The container will check is cgroups sanitization is required (can be skipped with SKIP_PRIVILEGED=true ENVVAR).
• The container will start docker using the official dockerd-entrypoint.sh script + additionals server args.

Configure

Env var name	Description
SKIP_PRIVILEGED	Skip cgroups sanitization (default: false)
LOG_FILE	Docker daemon output log file within the container (default: /var/log/docker.log)
STARTUP_TIMEOUT	Maximum time the script will wait for docker to start in seconds (default: 120)
MAX_CONCURRENT_DOWNLOADS	To set the dockerd --max-concurrent-downloads arg (default: none)
MAX_CONCURRENT_UPLOADS	To set the dockerd --max-concurrent-uploads arg (default: none)
INSECURE_REGISTRY	To set the dockerd --insecure-registry arg (default: none)
REGISTRY_MIRROR	To set the dockerd --registry-mirror arg (default: none)

Usage in Concourse

jobs:
  - name: my-job
    plan:
      - task: my-task
        privileged: true
        config:
          platform: linux
          image_resource:
            type: registry-image
            source:
              repository: cycloid/concourse-dind
              tag: latest
          run:
            path: concourse-dind-entrypoint.sh
            args:
              - 'bash'
              - '-ec'
              - |
                # Docker is started by the concourse-dind-entrypoint.sh entrypoint script

                # You can put here your code using docker

                # You can load docker images downloaded in advance by Concourse using the `docker_load` function
                source /opt/docker-utils.sh
                docker_load image_database/image.tar
                # or loading multiples images using GLOB
                docker_load "image_*/image.tar"

Build manually

docker build -t cycloid/concourse-dind:manual .