'kresd' throws errors and warnings...

'kresd' throws errors and warnings...

[Matthias Fischer]

Hi,

while searching for the reason why the zone files can't be updated or
changed, I've found these earnings / errors from 'kresd':

***SNIP***
root@ipfire: ~ # kresd
[system] warning: hard limit for number of file-descriptors is only 4096
but recommended value is 524288
[net   ] bind to '127.0.0.1@53' (TCP): Address already in use
[system] error while loading config:
/usr/lib/knot-resolver/postconfig.lua:42: bind to 127.0.0.1@53 error
occurred here (config filename:lineno is at the bottom, if config is
involved):
stack traceback:
        [C]: at 0x004162f0
        [C]: in function 'pcall'
        /usr/lib/knot-resolver/postconfig.lua:40: in main chunk
ERROR: net.listen() failed to bind (workdir '/root')
***SNAP***

Can anyone confirm? Is there a need for action?

Best
Matthias

Re: 'kresd' throws errors and warnings...

[Michael Tremer]

Hello Matthias,

You are trying to start a Knot Resolver worker when Knot Resolver is already running in the background.

That is all about this one.

Best,
-Michael

> On 22 Jul 2026, at 15:00, Matthias Fischer <matthias.fischer@ipfire.org> wrote:
> 
> Hi,
> 
> while searching for the reason why the zone files can't be updated or
> changed, I've found these earnings / errors from 'kresd':
> 
> ***SNIP***
> root@ipfire: ~ # kresd
> [system] warning: hard limit for number of file-descriptors is only 4096
> but recommended value is 524288
> [net   ] bind to '127.0.0.1@53' (TCP): Address already in use
> [system] error while loading config:
> /usr/lib/knot-resolver/postconfig.lua:42: bind to 127.0.0.1@53 error
> occurred here (config filename:lineno is at the bottom, if config is
> involved):
> stack traceback:
>        [C]: at 0x004162f0
>        [C]: in function 'pcall'
>        /usr/lib/knot-resolver/postconfig.lua:40: in main chunk
> ERROR: net.listen() failed to bind (workdir '/root')
> ***SNAP***
> 
> Can anyone confirm? Is there a need for action?
> 
> Best
> Matthias
>