Let’s see how the Zabbix active agent autoregistration works in the communication. I have configured the Zabbix agent (version 6.2.3) on the Linux host at 192.168.7.17 with this configuration: ServerActive=192.168.7.15 Hostname=Test-agent After restarting the agent, the Zabbix server (version 6.2.3) at 192.168.7.15 logged immediately in /var/log/zabbix/zabbix_server.log: cannot send list of active checks to “192.168.7.17”: host […]
Tag: zabbix
Basics of Zabbix API with Python and PyZabbix
Zabbix API is the way to go when you need to manage Zabbix configurations or get data from Zabbix programmatically. For Python applications one of the community-based libraries is PyZabbix. Note: There is also a package called py-zabbix. That is a different one, not handled in this post. In this post I’ll show: How to […]
Graph Filtering Gotcha When Upgrading from Zabbix 5.0 to 6.0
The current Long Term Support (LTS) version series of Zabbix is 6.0, released in February 2022. The previous LTS version was 5.0, released in May 2020. Many of us are upgrading the Zabbix installation from 5.0 to 6.0 series these days, here is one catch to be aware of. In 5.0, when viewing graphs of […]
Tag Guidelines in Zabbix
This is a tag-specific summary from the official Zabbix guidelines documentation, based on the situation as of Zabbix 6.0 LTS. Note: “Please note that this model might become enforced in the future Zabbix releases. Templates that do not follow specified rules will need to be updated.“ Tag name and value format lowercase only allowed characters: […]
Moving Zabbix Database
In the series “why wouldn’t I put this out public instead of just saving it to my own notes”: Moving the Zabbix database to a new database server. Old server: Debian Linux 9, running MariaDB 10.1.48 New server: Debian Linux 11, running MariaDB 10.5.12 (from Debian packaging) Zabbix (5.0.19 LTS) frontend is running on Apache […]
Configuring SNMP Trap Receiver for Zabbix on Debian
In order to handle SNMP traps in Zabbix you need to configure your server to receive the traps. Here are the steps, tested with Zabbix 5.4 on Debian Linux 10 (Buster), assuming Zabbix server has already been installed from the official repository: (Note: Long commands and paths below can appear split incorrectly, so be careful […]
How to Decrypt TLS Traffic with Wireshark
This is a small note to keep the links to posts by Peter Wu: Extract pre-master keys from an OpenSSL application Extracting openssl pre-master secret from apache2 Example in Debian Buster: With the keys saved by that process (and doing the packet capture at the same time, in either server or client side), you can […]
High Availability Clustering with Zabbix on Debian
Later in this document: Setting up the database servers Setting up the Zabbix servers Setting up the frontend (web) servers Edmunds Vesmanis had a presentation in Zabbix Summit 2019 about Zabbix HA setups (video in Youtube), and he also wrote a post in Zabbix blog titled High Availability cluster building with Zabbix for continued service: […]
Configuring MariaDB Replication
This is a plain list of actions I did when creating a MariaDB database master-slave replication setup. It is assumed that you already know why you want to create such a configuration and how you can use it in your case. Some links anyway: Global Transaction ID (mariadb.com): “[…] it is generally recommended to use […]
Zabbix Protocol Dissector for Wireshark
While troubleshooting a Zabbix communication problem I realized that there was no Zabbix protocol dissector in Wireshark. Long story short: I wrote my own dissector in Lua as an exercise. Actually, I wrote two dissectors, one for Zabbix passive agent communication (port 10050, the not-so-json-style protocol) and one for other Zabbix components (port 10051). You […]