Mounting a container volume into another container on a different path

Question

Is it possible to mount a volume from a container into another container on a different path? E.g.

• contA exposes a volumen /source
• mounting it in another container docker run --volumes-from contA -v /source/somedir:/etc/otherdir

I'm trying to use this with docker-compose and jwilder/nginx-proxy:

docker-compose.yml

myapp:
  build: .
  command: ./run.sh
  volumes:
    - /source

nginx:
  image: jwilder/nginx-proxy
  volumes_from:
    - myapp
  volumes:
    - /source/vhost.d:/etc/nginx/vhost.d:ro
    - /var/run/docker.sock:/tmp/docker.sock
  links:
    - myapp:myapp

If I'm trying so, I can't see my files at /etc/nginx/vhost.d:

$ docker-compose run nginx bash                                  
root@f200c1c476c7:/app# ls -l
total 32
-rw-r--r-- 1 root root 1076 Apr  9 22:10 Dockerfile
-rw-r--r-- 1 root root 1079 Apr  9 22:10 LICENSE
-rw-r--r-- 1 root root  129 Apr  9 22:10 Procfile
-rw-r--r-- 1 root root 8385 Apr  9 22:10 README.md
-rw-r--r-- 1 root root 5493 Apr  9 22:10 nginx.tmpl
root@f200c1c476c7:/app# ls -l /etc/nginx/vhost.d
total 0
root@f200c1c476c7:/app# ls -l /source/nginx/
total 8
-rw-r--r-- 1 1000 staff 957 Apr 24 07:17 dockerhost.me

Answer 1

It doesn't seem possible, considering the syntax - v /host/path:/container/path is reserved for mounting a path from host (and not from another container)

That leaves you with the option of adding to your second container a symbolic link from /etc/otherdir to /source/somedir (which will exist because of the --volumes-from contA directive)