[LAU] changing ulimit from rc.local in order to start audio scripts from there

[Athanasios Silis]

Hi Jeremy,
the file you refer to already exists and "nass" user is already part of the
@audio group.
Are you implying that limits could be raised even without uncommenting the
line in /etc/pam.d/su:
# session    required   pam_limits.so

??

BTW this is indeed what make it all work. Thank you :)

On Tue, Oct 10, 2017 at 10:16 AM, Jeremy Jongepier <jeremy at autostatic.com>
wrote:

> Hello Athanasios,
>
> On 10/09/2017 08:15 PM, Athanasios Silis wrote:
> > Hi there,
> > I have setup an audio system around jackd based on ubuntu studio (14.04
> > LTS). I have written various scripts to setup jackd and clients. It is
> > tested and up running. Now I would like to add a cmd in rc.local in order
> > for the whole system to be brought up at boot.
> >
> > I tried
> >
> > #set limits
> > su - nass -c "ulimit -r 95 -l unlimited" 2>&1 | tee -a  /tmp/audio.log
> >
> > #verify limits
> > su - nass -c "ulimit -r -l" 2>&1 | tee -a  /tmp/audio.log
> >
> > #boot audio stuff
> > su - nass -c "cd /home/nass/audio_setup/scripts ; bash ./cmdaudio start"
> > 2>&1 | tee -a  /tmp/audio.log
> >
> > However the ulimit "set" command fails with message
> > ulimit: real-time priority: cannot modify limit: Operation not permitted
> >
> > I read that ulimits are not ready yet at this time. Is there a way to
> > forcefully "bring them up" in order to have them set for the user "nass"
> > before starting the audio scripts ??
> >
>
> Try uncommenting the following line in /etc/pam.d/su:
> # session    required   pam_limits.so
>
> Reboot and your script should work. I would advise you though to not set
> limits this way but to add the nass user to the audio group and check if
> /etc/security/limits.d/audio.conf exists. If it doesn't then run sudo
> dpkg-reconfigure jackd2 and answer yes to the question if you want to
> use JACK with realtime settings.
>
> Best,
>
> Jeremy
>
>
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