Cannot increase open file descriptors above 1024

Ibrahemoo Ghost ibrahemooghost at
Fri Nov 18 08:45:55 UTC 2022

> Is there any error?  Can you run it in debug mode to see what's going on?

I am running under ubuntu server 20, After raising the file descriptors
limit, When i run freeradius as service (in multithreaded mode) signal gets
aborted after 1 second with the following error in syslog:
freeradius.service: Main process exited, code=killed, status=6/ABRT
freeradius.service: Failed with result 'signal'.

But when i try to run it under debug mode freeradius -X (single threaded),
it works fine, but the problem is i can't put it under single threaded mode
for too long because it is in production environment.

What I've done right now to temporarily solve the issue of reaching 1024
file descriptors limit: Is to decrease sql connection pools values as
idle_timeout = 1
retry_delay = 1

But I know this is a temporary solution and the problem will rise again
when my network grows.

I could not share the connection pool across sql instances because it
shared a single connection to a single database, What I want is to have
each sql instance connect to a different database (Under the same mysql

Best Regards
Ibrahem Ghost

On Thu, Nov 17, 2022 at 11:29 PM Alan DeKok <aland at>

> On Nov 17, 2022, at 2:30 PM, Ibrahemoo Ghost <ibrahemooghost at>
> wrote:
> > I actually added freerad limits on /etc/security/limits.conf then
> > rebooted and also tried to run freeradius as root.
> > Then I discovered that increasing the limit for the user only does not
> > affect the service itself, By examining the soft limit file values in
> > /proc/$pid_of_freeradius/limits (1024)
> >
> > The only way to increase the limit is by also increasing it in the
> > service file, but as I said after that the service won't start
> > anymore.
>   What does that mean?
>   Is there any error?  Can you run it in debug mode to see what's going on?
>   There is nothing in FreeRADIUS which says "don't start if the OS allows
> more than 1024 file descriptors".
>   Alan DeKok.
> -
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