Checking SSL Certificate Expiration and Notifying the Result to Slack

Overview

The SSL certificate expired and the site became inaccessible.

I built this so that something like the above would not happen.

Shell Script

• It checks the expiration dates of multiple domains configured in DOMAIN_LIST.

• In practice, I run this on Jenkins, and the build parameters make it easy to add domains.

• I do a review every first Monday of the month.

Monitoring with Zabbix as Well

I found an article on Qiita.

Monitoring SSL certificate expiration with Zabbix

You can also set up a phone notification once there is less than a week left. Whatever the measure, having something in place gives you peace of mind.

That’s all.