I use certdays for it: https://github.com/no-gravity/certdays https://github.com/no-gravity/certdays Works with any monitoring system. For example if you want

I use certdays for it: https://github.com/no-gravity/certdays https://github.com/no-gravity/certdays Works with any monitoring system. For example if you want your tests to fail if the cert for a domain is valid for less that 14 days, you put this in your tests: certdays.sh somedomain.com 14