Multiple .dockerignore files in same directory

Question

In the same directory I have two Dockerfiles and I would like to add a separate .dockerignore for each of them.

Currently, I have:

Dockerfile.npm
Dockerfile.nginx

But can I have something like this?:

.dockerignore.npm
.dockerignore.nginx

user_1927079 · Answer

You can now use multiple .dockerignore files in Docker.

Firstly you need to enable BuildKit mode; this is done either by setting:

export DOCKER_BUILDKIT=1

or by adding this configuration:

{ "features": { "buildkit": true } }

to the Docker daemon configuration in ~/.docker/daemon.json and restarting the daemon. This will be enabled by default in future.

You also need to prefix the name of your .dockerignore file with the Dockerfile name.

So if your Dockerfile is called OneApp.Dockerfile the ignore file needs to be called OneApp.dockerignore.

user_451480 · Answer

Multiple dockerignore files or specifying which dockerignore file to use is currently not supported by Docker.