How to link docker containers on build?

Question

I linked my app container to postgres on run:

docker run --link postgres:postgres someproject/develop

and it worked fine.

Answer 1

True, but docker build does accept the --network option.

You can put your prerequisite containers on a named / custom network, e.g.:

docker network create whatever
docker run --network whatever --name postgres [etc.] someproject/develop

Then build on that network:

docker build --network whatever [etc.]

Works well.