How to add a program running in the background to startup?

Question

linux

You need to reread the squid config every second or faster.
Made a service like this, did systemctl daemon-reload && systemctl start my.service and but it doesn't work:

Process: 25961 ExecStart=/usr/bin/watch -n 1 squid -k reconfigure (code=exited, status=1/FAILURE)
Main PID: 25961 (code=exited, status=1/FAILURE)
systemd[1]: Started reread proxy config every 1 seconds.
watch[25961]: Error opening terminal: unknown.
systemd[1]: мой.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: мой.service: Failed with result 'exit-code'.

my.service:

[Unit]
Description=reread proxy config every 1 seconds
After=syslog.target
After=nginx.service

[Service]
#User=root
ExecStart=/usr/bin/watch -n 1 squid -k reconfigure
#Type=forking
#Restart=always

[Install]
WantedBy=multi-user.target

Maybe someone knows why?

Answer 1

Need to reread squid config every second or faster

You are clearly doing something wrong.

Answer 2

do you need a daemon for that? go to crontab

Answer 3

As already said, most likely you can avoid the need to do a reload every second.
But if you still want to do this, then you need to use systemd timer, not service: https://opensource.com/article/20/7/systemd-timers