Docker: adding a file from a parent directory

Question

In my Dockerfile I‘ve got :

ADD ../../myapp.war /opt/tomcat7/webapps/

That file exists as ls ../../myapp.war returns me the correct file but when I execute sudo docker build -t myapp . I‘ve got :

Step 1 : ADD ../../myapp.war /opt/tomcat7/webapps/
2014/07/02 19:18:09 ../../myapp.war: no such file or directory

Does somebody know why and how to do it correctly?

Some workarounds superuser.com/questions/842642 – Günter Zöchbauer Nov 30 ‘14 at 19:51 — Günter Zöchbauer, Nov 30 ‘14 at 19:51

mbarthelemy · Accepted Answer · 2016-06-20 12:45:01Z

Unfortunately, (for practical and security reasons I guess), if you want to add/copy local content, it must be located under the same root path than the Dockerfile.

From the documentation:

The <src> path must be inside the context of the build; you cannot ADD ../something/something, because the first step of a docker build is to send the context directory (and subdirectories) to the docker daemon.

EDIT: There‘s now an option (-f) to set the path of your Dockerfile ; it can be used to achieve what you want, see @Boedy ‘s response nelow.

Is there a "clean" workaround for this? I‘d rather not restructure my whole project directory just to accommodate this. – ben_frankly Nov 21 ‘14 at 18:35 — ben_frankly, Nov 21 ‘14 at 18:35
As said by @Günter, there is a workaround here superuser.com/a/842690/136024 ... is it really "clean"? Well at least it‘s a "workaround" :) – Anthony O. Dec 2 ‘14 at 8:39 — Anthony O., Dec 2 ‘14 at 8:39
See better answer from @Boedy stackoverflow.com/a/34300129/2950621 – nmgeek Jun 19 at 19:27 — nmgeek, Jun 19 at 19:27

Boedy · Answer 2 · 2015-12-15 21:54:08Z

up vote8down vote

You can build the Dockerfile from the parent directory:

docker build -t <some tag> -f <dir/dir/Dockerfile> .

answered Dec 15 ‘15 at 21:54

Boedy

388515

Worked smoothly ;) – Souciance Eqdam Rashti Mar 2 at 10:51

Thank you! This works fine on a local box, but Docker Hub fails to build the image since it tries to do it from its same directory (tbh, just what one would normally expect). Is there any way to do the same trick in Docker Hub? – Marcel Hernandez Mar 25 at 20:31

Not that I know of. You could push the image to the registry instead of using automated build. – Boedy Mar 29 at 9:15

1

This should be marked as the right answer – Courtland Caldwell Jun 15 at 19:09

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score 0down vote · Answer 3

The solution for those who use composer is to use a volume pointing to the parent folder:

#docker-composer.yml

foo:
  build: foo
  volumes:
    - ./:/src/:ro

But I‘m pretty sure the can be done playing with volumes in Dockerfile.

Docker: adding a file from a parent directory

3 Answers