Docker in Docker cannot mount volume

Question

I am running a Jenkins cluster where in the Master and Slave, both are running as a Docker containers.

The Host is latest boot2docker VM running on MacOS.

T

Answer 1

You can solve this passing in an environment variable. Example:

.
├── docker-compose.yml
└── my-volume-dir
    └── test.txt

In docker-compose.yml

version: "3.3"
services:
  test:
    image: "ubuntu:20.04"
    volumes:
      - ${REPO_ROOT-.}/my-volume-dir:/my-volume
    entrypoint: ls /my-volume

To test run

docker run -e REPO_ROOT=${PWD} \
   -v /var/run/docker.sock:/var/run/docker.sock \
   -v ${PWD}:/my-repo \
   -w /my-repo \
   docker/compose \
   docker-compose up test

You should see in the output:

test_1  | test.txt