Feature: ryuk should be able to use TCP socket to connect to Docker engine API

[snowflyak]

What are you trying to do?

I'm trying to run testcontainers on a host with Docker Engine API exposed via TCP socket instead of a Unix socket. Testcontainers run fine but ryuk fails to start because it wants to bind mount /var/run/docker.sock into container.

Using unix socket and bind mounts is hardcoded here:

testcontainers-python/core/testcontainers/core/container.py

Lines 285 to 293 in e7feb53

	Reaper._container = (
	DockerContainer(c.ryuk_image)
	.with_name(f"testcontainers-ryuk-{SESSION_ID}")
	.with_exposed_ports(8080)
	.with_volume_mapping(c.ryuk_docker_socket, "/var/run/docker.sock", "rw")
	.with_kwargs(privileged=c.ryuk_privileged, auto_remove=True)
	.with_env("RYUK_RECONNECTION_TIMEOUT", c.ryuk_reconnection_timeout)
	.start()
	)

Supporting mTLS TCP sockets would also be cool. mTLS support may be split off into another issue though.

Other references:

• Similar issue in testcontainers-java: [Bug]: Testcontainers forces Ryuk to use Unix sockets as Docker host, breaking environments which use a TCP socket testcontainers-java#9137