Port 5000 is already in use on OS X

[danlishka]

When switching from Linux to OSX for development, I run into this issue when launching a control plane in the development mode:

panic: listen tcp 0.0.0.0:5000: bind: address already in use

We run HTTP metrics on port 5000 as defined in the app/controlplane/configs/config.devel.yaml file.

In the latest versions of OSX, the AirPlay service process uses the 5000 port as well.

lsof -i :5000
COMMAND    PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
ControlCe 1081 d    7u  IPv4 0x4dfbc9201515d62b      0t0  TCP *:commplex-main (LISTEN)
ControlCe 1081 d    8u  IPv6 0x4dfbc9201439e933      0t0  TCP *:commplex-main (LISTEN)

There is a way to change it in System Preferences/Sharing by unchecking the AirPlay Receiver to fix the issue, but I think we better change this port or adequately document it.