thank you Stefan for that suggestion, this is a very good idea!
I wish you a very nice sunday, too!
nobody
0
NobbZ
Cowboy does bind to 0.0.0.0 (aka all interfaces) per default and cowboy is the web server used by phoenix.
As I already mentioned in How to bind phoenix app to specific ip address? - #2 by NobbZ you can of course change the IP to bind to. And as you can set a config, you can ask for its value as well.
2
nobody
you are right, sysasi - I should have asked more detailed, so really everybody can understand it!
So to be very exact I would like to get the IP address to which phoenix binds to automatically when it is run, I jsut wanted to add a quick debug statement in my template for this, but then it turns out that it evolves into a major task.
Of course in the end it is much more important to be able to bind phoenix to a specific ip address, please see my other question about that from today, thank you very much!
1
joe
If anyone else is looking for it’s own IP address and finds this thread.. In my nerves project I use :inet.getif/0 and loop through the result until I find one that fits my pattern (e.g. one that starts with 192.168).
3
PJUllrich
Author of Building Table Views with Phoenix LiveView
Just a side note: If you cannot get your “real world” IP with :inet.getif/0, then you might want to consider making a HTTP-Request to https://httpbin.org/ip, which simply returns your request-IP.
1
blackham
A way to make a good guess at your server IP. (It might not be your public IP if you have NAT). Sadly I couldn’t find a way for erlang to return a list of the network routes, so I had to fall back to a System.cmd call. The idea is find the default gateway for the server, see what dev (interface) it us using, then find the IP addr of that device.
I promise there are better ways to do this that will work with ipv6, not rely on a System.cmd (like read /proc), handle multiple IPs assigned to the same device, etc.. but its’ quick and dirty and works for me.:
# Get the name of the default interface (IF)
# Wish erlang hand a command to nicely get the route information
# Could work with `netstat -rn` too with some changes to the regex
{result, 0} = System.cmd("ip", ["route","list","default"])
default_if = Regex.scan(~r/.*dev (.*) .*/U, result, capture: :all_but_first) |> List.first |> List.first |> String.to_charlist
# Now find the default device in the list of all devices
{:ok, ifs} = :inet.getifaddrs
{_if, attrs} = List.keyfind(ifs, default_if, 0)
# Now grab the IP in {a,b,c,d} format
{:addr, ip} = List.keyfind(attrs, :addr, 0)
# Now make it a string (sorry, binary BitString.. whatever)
{a,b,c,d} = ip
"#{a}.#{b}.#{c}.#{d}"
0