I\'m trying to start python script with start-stop-daemon:
sudo /sbin/start-stop-daemon --start --pidfile /home/loop.pid \\
--user www-data --group www-data -b
I tried your script and command line, and it is working on my machine. Are you sure your script is located at /home/loop.py
?
Also, don't expect to see those prints, because you are specifying the -b
(background) option, so the process is being detached from your terminal. Try running it without the -b
for testing purposes and then you can redirect the standard output to a logfile with the -stdout
option:
sudo /sbin/start-stop-daemon --start --pidfile /home/loop.pid \
--user www-data --group www-data -b --make-pidfile --chuid www-data \
--exec /usr/bin/python /home/loop.py --verbose -stdout /var/log/loop.log
Rather than exec python directly, if you --exec (or --startas) a nested shell, then you can do the redirection in there (as per this answer):
start-stop-daemon --start --quiet --chuid $DAEMONUSER \
--make-pidfile --pidfile $PIDFILE --background \
--startas /bin/bash -- -c "exec $DAEMON $DAEMON_ARGS > /var/log/some.log 2>&1"
This works for me and logs my Python stdout quite happily once I realized the output was buffered (my script wasn't writing very much)! I then found this article which uses 'stdbuf' to flush to the output more eagerly than the default (and also explains it quite well):
start-stop-daemon --start --background \
--pidfile $PIDFILE --make-pidfile --startas /bin/bash \
-- -c "exec stdbuf -oL -eL $DAEMON $DAEMONARGS > $LOGFILE 2>&1"