Running Phoenix on Unix socket

[acrolink]

How to do that?

[entone]

I’m not sure how it would be done through Phoenix, but I believe you can pass {:local, "/path/to/unix/socket"} to :cowboy.start_clear() as a transport option. I haven’t tested this myself, but the docs would lead me to believe that.

https://ninenines.eu/docs/en/cowboy/2.6/manual/cowboy.start_clear/
https://ninenines.eu/docs/en/ranch/2.0/manual/ranch_tcp/

Specifically this from the ranch_tcp docs,

On UNIX systems, it is also possible to use a UNIX Domain socket file by specifying {local, SocketFile} .

[hubertlepicki]

Yes, you do it like that, also set port to 0.

This thread may be helpful:

Running Phoenix on a Unix socket

Much of this depends on the version of kernel. It is true that since the beginning of time, communication over the loopback subnet went through the entire TCP stack, twice, “outgoing” and “incoming”. But in some recent’ish Linux kernel short-circuiting was added so that those comms now skip that overhead and work much more like domain sockets.

[acrolink]

Indeed, it is possible like this:
http: [ip: {:local, '/srv/phx/project/development.socket'}, port: 0],

Thanks @entone, @hubertlepicki