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trying to figure out how to tell a docker container from compose A to communicate with a container from compose B. set up a simplified set of compose files with containers running socat to try and figure things out.
now, of course, i can't even talk to a single container in one of those composes from the host. and am wondering if anything will ever work ever.
happily, this seems to have been something wrong with the socat processes running inside the containers. changed one of them to an nginx container, and everything Just Worked. kinda annoyed, but not enough to really spend any time root causing this. going to just take the win.