Mounting volume from CI container into docker-compose container

Question

We're using CircleCI for a project, with the default docker execution type. This means that each CI job that gets kicked off starts a new Docker container, and the build runs inside that container.

This CI container has the following files:

docker-compose.yml
sql-setup.sql

This docker-compose.yml file starts a MySQL image and uses volumes to copy the SQL script inside so it's ready at startup, like:

  mysql:
    image: mysql:8.0.18
    ...
    volumes:
      - ./sql-setup.sql:/docker-entrypoint-initdb.d/sql-setup.sql

(This works on a local developer machine.)

The Problem is that when running on CI, the docker-compose up in the 'parent' CI container creates a 'child/sibling' container with:

drwxr-xr-x 2 root root   40 Jul  8 17:26 sql-setup.sql

Note it's a directory!

My debugging suggests this is because ./sql-setup.sql doesn't exist on the host . (Only on the CI container running on the host .)

My Question: How can I configure my docker-compose.yml (or my CircleCI config) so that the file from the CI container (which is running docker-compose up ) gets copied properly into the resulting mysql compose container?

Answer 1

Using machine executor instead of docker executor solves this

Ref: https://discuss.circleci.com/t/copying-files-to-docker-compose-container/12837