problem deploying on google cloud instance
I have build the hello world example and I am trying to deploy this on a Google Cloud instance. It seems to run fine locally (hence it has all the necessary library dependencies). However, I am not able to it to deploy on the server.
I am trying (using my actual http address which is different from the example below)
./hello --docroot . --http-address 126.96.36.1994 --http-port 80
but it responds with
Error (asio): bind : cannot assign requested address
It seems to work fine using (0.0.0.0/0)
The cloud instance allows HTTP tcp/80 traffic.
Any ideas what might be wrong?
I have tried setcap 'cap_net_bind_service=+ep' ~/hello
to allow non-root users to publish on ports below 1024, but also to no avail.
RE: problem deploying on google cloud instance - Added by Wim Dumon 9 months ago
No idea... any luck with './hello --docroot . --http-address 0.0.0.0 --http-port 80'? 0.0.0.0 means 'listen on all interfaces'.
It is correct that you have to be root to listen on ports < 1024 on unix systems. You may test to run the Wt application as root; if that works, your setcap command may be wrong or insufficient...
Wim thanks that (./hello --docroot . --http-address 0.0.0.0 --http-port 80') works. However, this does not look like a production solution. It seems the machine could be misused for DoS attacks.
I also tried to run it as ./hello --docroot . --http-address 10.150.0.4 --http-port 80
where 10.150.0.4 is the interal IP and that also works. This already looks more secure, but would be great if anyone could confirm that it is save.