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Can I create a container using docker run <image> without the --link option and link other containers to it afterwards? If so, how do I link these containers then?
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Surprisingly or not, neither Docker nor Podman support exposing multiple containers on the same host's port right out of the box. Example: docker-compose failing scenario with "Service specifies a port on the host. If multiple containers for this service are created on a single host, the port will clash."
It is possible to grant a container access to docker so that it can spawn other containers on your host. You do this by exposing the docker socket inside the container, e.g: docker run -v /var/run/docker. sock:/var/run/docker.
Thats how you normally would do it. Fire up container A and start container B with --link B:resourcename. Inside container B, you can now get to the stuff container A EXPOSEs, with the info you can see inside the environment-variables env (they will be named something with resourcename in this case.
You can not do this the other way around (as I thought your question was originally about). The information the container needs to get to resources on the other is available as environment-variables. Which you cant inject into a running process (as far as I know..).
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