Hello Steven, it's because of Ubuntu's systemd hardening setup since Ubuntu 24.04, please see here for more details and solution: https://mmonit.com/wiki/Monit/FAQ#hardening
Best regards, The M/Monit team > On 9. 4. 2025, at 23:50, Steven Christensen <ste...@c88.org> wrote: > > I have a new Ubuntu VM and I installed monit (version 5.33.0). I am > well-versed with monit, and run it on multiple platforms. > > Anyway, I have a simple configuration to check for the existence of a > process, and if it is missing, start it. > > Here is the configuration > ===================================== > check process udptunnel matching "127.0.0.1:21116 <http://127.0.0.1:21116/>" > start program = "/root/start_udptunnel.sh" with timeout 15 seconds > stop program = "/usr/bin/pkill -f 'udptunnel -s 21000'" > ===================================== > > The start_udptunnel.sh script looks like this: > ===================================== > #!/bin/bash -x > > echo "Starting" | ts >> /tmp/udptunnel.log > /usr/local/sbin/udptunnel -s 21000 127.0.0.1:21116 <http://127.0.0.1:21116/> > -v 2>&1 | ts >> /tmp/udptunnel.log & > exit 0 > ===================================== > > Everything works when I invoke start_udptunnel.sh manually. The permissions > on start_udptunnel.sh are appropriate. > > However, when I start up monit, this is in the log: > ===================================== > [2025-04-09T16:21:08+0000] info : Reinitializing monit daemon > [2025-04-09T16:21:08+0000] info : Reinitializing Monit -- control file > '/etc/monit/monitrc' > [2025-04-09T16:21:09+0000] warning : /etc/monit/conf-enabled/udptunnel:2: > Program does not exist: '/root/start_udptunnel.sh' > [2025-04-09T16:21:09+0000] info : 'xxxxxxxx.com <http://xxxxxxxx.com/>' > Monit reloaded > [2025-04-09T16:21:20+0000] error : 'udptunnel' process is not running > [2025-04-09T16:21:21+0000] info : 'udptunnel' trying to restart > [2025-04-09T16:21:21+0000] info : 'udptunnel' start: > '/root/start_udptunnel.sh' > [2025-04-09T16:21:21+0000] error : 'udptunnel' failed to start (exit > status -1) -- Program /root/start_udptunnel.sh failed: File > '/root/start_udptunnel.sh' does not exist > ===================================== > > For the life of me I can't figure out why monit says that the script doesn't > exist. > > I have copied and pasted the script name from the log just to make sure there > is no typo. > > Am I missing something obvious? > > Thanks
