After getting frustrated that Kuma, a tool for monitoring applications cannot run on FreeBSD due to unsupported Node dependencies, I decided to write a simple Python script to check some of my services and email me in case I’m wrong.
This script only uses the standard library, so it should be able to run in any environment. Just make sure your python distribution have sqlite support, fill in the configuration file and run it using cron job.
I configure the jobs the following way (in a freebsd jail):
0 */2 * * * /usr/local/bin/python3 /root/simple-smtp-monitoring/main.py --type regular
0 0 * * * /usr/local/bin/python3 /root/simple-smtp-monitoring/main.py --type resume
This way it will check each url every 2 hours, and at end of each day it will report the result to me.
What it does? It has a string check if it should use urllib or telnetlib, and opens a connection
to the url (GET requests and telnet open command). If everything goes correctly, it logs the result,
and with fails it sends an email.