port number range for Passenger with Node.js

[Puneet T]

Hi,

I am using the Passsenger inversion of control to launch an Express app, as suggested in a gist given in the thread here: https://groups.google.com/forum/#!topic/phusion-passenger/sZ4SjU8ypwc

I checked the port number used by the Node app when launched using Passenger is 57911.

$ netstat -atpee|grep node
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode       PID/Program name
tcp        0      0 *:57911                 *:*                     LISTEN      xxxxx     917107      29318/node   

I want to make sure that I do not use the ports used by Passenger in any other application. So wanted to check if the range of port numbers that Passenger may use to launch Express app, is it documented somewhere?

Thanks,
Puneet

[Hongli Lai]

Phusion Passenger uses a random available port. It does so by binding
to port 0, and then the OS tells it which port was chosen.

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