How to use Linux software watchdog?

Question

Can anybody tell me how to handle the software watchdog in Linux?

I have a program SampleApplication which runs continuously and I need to restart it if

Answer 1

You can use "Monit" utility to restart and monitor your services. Simply install by issuing command `"apt-get install monit".

Answer 2

If anyone has arrived at this page looking for an operating system watchdog (which is not directly what the OP wanted), this is what you need:

sudo apt-get install watchdog
service watchdog status
service watchdog start 

To check that it's working execute:

tail -f /var/log/syslog | grep watchdog

You should see something like:

Jul 25 22:03:35 nuc watchdog[14229]: still alive after 733 interval(s)
Jul 25 22:03:36 nuc watchdog[14229]: still alive after 734 interval(s)
Jul 25 22:03:36 nuc watchdog[14229]: still alive after 735 interval(s)
Jul 25 22:03:37 nuc watchdog[14229]: still alive after 736 interval(s)
Jul 25 22:03:37 nuc watchdog[14229]: still alive after 737 interval(s)

I hope I'm answering the question correctly. All the other answers seem to be very different.

Answer 3

Use /etc/inittab you can utilize it to start in the specific run levels and if it is killed it shall be restarted automatically

n:2345:respawn:/path/to/app

This will make it respawn in run levels 2345 you probably only need 3 and 5 but this will work fine and is built into Linux.