Category: Zabbix

Zabbix – Recognize bare-metal and virtual machines

This afternoon was spent on searching for ways to auto-register clients and assign them into different policies based on whether they’re virtual or not and, to my surprise, I couldn’t find an out-of-the-box way of achieving this with Zabbix.

After looking into different Zabbix agent calls and modules, I found a way I could use to reliably tell whether it’s a baremetal machine or not.

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Zabbix – Monitoring SSL certificate expiry dates and alerting when it’s due to expire

Nowadays almost every website provides an encrypted way of communication between itself and end user. I would love to say it’s because web administrators these are concerned about their visitors’ data safety but, while that might also be true in some cases, browsers these days will show a big “ERRRR, SOMETHING’S WRONG!” warning message when we try to connect to a non-HTTPS website.

While obtaining the certificates is pretty much free nowadays (as long as we’re OK with the amount of trustworthiness we get by running a Let’s Encrypt! certificate) and some providers will even help us put them in the right place, we still have to remember to renew our certificates every now and then. If we don’t then, oh well. We’re back to square one because having expired certificate is as good as having no certificate at all when it comes to browsers screaming at us.

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OPNSense – Monitor number of connected OpenVPN users with Zabbix

Hello everyone!

Recently I’ve been toying around with my new, fully featured lab. I couldn’t decide what kind of firewall I’d like to use (obviously considering the fact that I was trying to avoid getting anything commercial). I really enjoyed using pfSense in the past but felt like the UI was a bit dated. Fortunately, OPNSense exists!

After configuring everything and setting up remote access I decided to set up a Zabbix server in my new environment to keep an eye on various things. The one thing I couldn’t monitor, however, was the amount of remote users connected to my OpenVPN server hosted on my OPNSense firewall.

I read a couple of articles, as well as few stackoverflow questions and thought to myself – alright, that won’t be pretty. And it’s not. But hey, it works!

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