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Technically, you should be able to share a domain socket via a shared volume too (between an "app" and "web" container) - as with postgres:

Curious about benchmarks and tests of TCP vs Unix domain sockets between docker containers.

Another example is API Platform's docker setup:

I'm also curious on the performance differences between containers.

I found a simple comparison from 2014 - which shows Unix domain sockets to have a 2-3x advantage over localhost TCP:

"Unix Domain Sockets vs Loopback TCP Sockets"