Use multiple Docker containers without exposing ports

[almereyda (jon r)]

@almereyda

Where the term ports is being used for the regular Docker NATting to the host system, the term expose can be used to offer services inside a container without forwarding to the host system.

Since nginx-proxy catched up to Docker Networking support, this became prevailent again.
One workaround for this can look like the following in your pups YAML:

expose:
#  - "80"
#  - "2222:22"

# any extra arguments for Docker?
docker_args: --net=your_desired_network --expose=80

where no ports are exposed (in pups’ language) to certain ports (in Docker’s) of the host system, but exposed to a desired Docker network.