volumes_from instruction - docker compose

Question

With the below docker-compose.yml file:

test:
  build: ../../
  dockerfile: docker/dev/Dockerfile
  volumes_from:
    - cachev

cachev:
  build:         


        

Answer 1

Yes, you can verify by executing a command inside both containers. if creat file in test container under touch /build/fromtest.txt path, it will be visible in cacheV container on the same path /build/fromtest.txt.

volumes_from

Mount all of the volumes from another service or container

compose-file-volumes_from

A demo you can try

test:
  image: alpine
  command: sh -c "touch /build/fromtest.txt && echo hell from test-container && ls /build/"
  volumes_from:
    - cachev

cachev:
  image: node:alpine
  command: sh -c "touch /build/fromcache.txt && echo hello from cache-container && ls /build/"
  volumes:
    - /build

log will be

Recreating compose-volume_cachev_1 ... done
Recreating compose-volume_test_1   ... done
Attaching to compose-volume_cachev_1, compose-volume_test_1
cachev_1  | hello from cache-container
test_1    | hell from test-container
test_1    | fromcache.txt
test_1    | fromtest.txt
cachev_1  | fromcache.txt
cachev_1  | fromtest.txt