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Today's Topics:
1. Re: netdisco-web fails to bind after upgrade to version
2.078000 on Debian 11 (Sven Duscha)
--- Begin Message ---
Hi Oliver,
On 30.08.24 10:45, Oliver Gorwits wrote:
No, I think it unlikely that the IPV default changed; it's been the
same since 2012. The IPV variable comes from the Net::Server package
(socket handling) which is in turn used by the Starman package (web
server) which is in turn used by Netdisco.
My best guess is that Net::Server, when it checks for protocol support
in the operating system, is still getting the idea that IPv6 is
enabled/available. Something might have changed in the OS upgrade or
reinstallation of Netdisco to bring a newer library with different
behaviour, or there's another setting to set in Debian. I wouldn't know.
I see. I would have to check, if I can dig in a Debian 10 version and
compare it. I'd have to fire up a clone of my netdisco-VM booting the
backed up disk image. But I am not sure, if I have to the time for that.
And I am not so familiar with Perl packages interna.
Perhaps ask Debian support or open a ticket against Net::Server?
Unfortunately, the Net::Server code isn't easy to follow, and I don't
have a reproducing system on which to investigate myself, but it's
_probably_ this bit:
https://metacpan.org/dist/Net-Server/source/lib/Net/Server/Proto.pm#L107,
in case anyone with a system with the issue wants to have a dig around.
Thank you for the hint.
Would you be willing/able to add a section to this wiki page with the
hint for others? https://github.com/netdisco/netdisco/wiki/Troubleshooting
This would be my suggestion for the troubleshooting wiki page:
When having updated from Debian 10 (Buster) to Debian (Bullseye), in
order to get Python3 version 3.9.2, because a minimum version of
Python3.9 is required for netdisco version 2.078000, there is a problem
with binding the local 5000 port to the server's IP address, if you are
using an IPv4 address.
This can be seen in the netdisco logs, ~/logs/netdisco-web.log, where
netdisco tries to bind the local TCP port 5000 to an unset IPv6 address:
|2024/08/29-14:55:55 Starman::Server (type Net::Server::PreFork)
starting! pid(3862) Resolved [*]:5000 to [::]:5000, IPv6 Not including
resolved host [0.0.0.0] IPv4 because it will be handled by [::] IPv6
Binding to TCP port 5000 on host :: with IPv6 2024/08/29-14:55:55 Can't
connect to TCP port 5000 on :: [Invalid argument] at line 66 in file
/home/netdisco/perl5/lib/perl5/Net/Server/Proto/TCP.pm|
This can be solved by setting the environment variable IPV to 4, before
starting the netdisco web-frontend:
$ export IPV=4
$ /home/netdisco/bin/netdisco-web start
The content of IPV can be checked by:
$ printenv | grep IPV
It is advisable to set the IPV environment variable in your netdisco
user's .bashrc source script.
Best wishes,
Sven
--
Sven Duscha
Deutsches Herzzentrum München
TUM Universitätsklinikum
Lazarettstraße 36
80636 München
+49 89 1218 2602
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--- End Message ---
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