28 Jan
2019
28 Jan
'19
9:35 a.m.
On 28/01/2019 01.12, Peter P. wrote:
Now I try to start jackd automatically from a systemd
service file
created as /etc/systemd/system/jackd.service with the following
contents:
[Unit]
Description=jackd
After=sound.target
[Service]
User=peter
ExecStart=/usr/bin/jackd -d alsa -r 44100 -P
[Install]
WantedBy=multi-user.target
When I start that service it fails with errors in the journal:
"JACK is running in realtime mode, but you are not allowed to use
realtime scheduling."
and
"Please check your /etc/security/limits.conf for the following line"
and so on. Messages that are not present when starting jackd as user
from the command line.
Now I am puzzled because I thought that it is enough to specify user
"peter" in the systemd service.
When using systemd to start the service, use systemd directives to set
the limits. systemd won't start PAM session for this service, so
/etc/security/limits.conf is not used.
Try adding:
LimitRTPRIO=95
LimitMEMLOCK=infinity
to the [Service] section of your jackd.service file.
See `man systemd.unit` fro more info on setting the limits in a service
file.
Greets,
Jacek