VRRP (Virtual Router Redundancy Protocol) is commonly used for providing first-hop IPv4 or IPv6 router (“default gateway”) redundancy for network-attached devices. Some network appliances like wireless LAN controllers use it to provide a virtual IP that can always be used for reaching the active member in the device cluster. VRRP can also be used on […]
Entra ID Groups to NetBox 4.x Groups
When using the built-in SSO (Single Sign-On) in NetBox with Entra ID, the Active Directory (AD) group or role information for the users is not available out of the box. Based on the discussions in NetBox repo I tested and wrote down a short memo of getting the users’ groups usable in NetBox. In this […]
Debian Template with cloud-init on Proxmox VE
These notes have been tested with Proxmox Virtual Environment (PVE) 8.2.4, Debian 12 and cloud-init 22.4.2 (from Debian 12 packaging). First create a virtual machine and install Debian Linux on it normally, with all the additional tools and updates as required. I usually use the netinstall CD image from Debian. After completing the installation, for […]
Size of Debian Linux Installation
I often need a Linux virtual machine for testing specific things. Debian Linux is my choice of Linux distribution, and I have wondered how much space does each installed package take in it, to possibly optimize the size of the VM if needed. I installed two VMs: The results after “sudo apt clean“: Installation Disk […]
VDR Setup, 2025 Edition
RuuviTag Monitoring in Zabbix
RuuviTag is a small battery-powered sensor that measures temperature, humidity, air pressure and movement. It communicates the measured data by broadcasting the data values using Bluetooth. I’m using a few of those sensors to monitor some rooms at home. There is an official Ruuvi Gateway Router available that can be used to interface the RuuviTags […]
SQLite Commands
You know cloud computing is powered by shell scripts and SQLite databases, right? That’s how the saying goes. But what is an SQLite database anyway? It is a file, and it can be inspected with the SQLite application or a compatible library. There is no server daemon to connect to. Usually, when accessing a database, […]
24-hour Timestamps for Zabbix 7
The default language in the Zabbix user interface (UI) installation is “en_US”, meaning English (US). Probably because of the European roots of Zabbix, the timestamps have still been shown in 24-hour (world-standard) format, up until Zabbix version 6.4. Now in Zabbix 7.0 the default time display format has been changed to correspond to the selected […]
MAC Address Move in VM Live Migration
The switches in Ethernet networks learn all connected hosts’ link-layer addresses (layer 2 or MAC (Media Access Control) addresses) dynamically when the hosts communicate in the network and the switches see the traffic. Based on that information the switches are then able to forward frames optimally without flooding. When you disconnect a physical host from […]
HE Dynamic DNS ACME Support for Proxmox VE
Since the Broadcom’s announcement about changing the licensing for VMware vSphere products and discarding the free Hypervisor license, there has been a massive uptake for other virtualization platforms. Also in my own systems, where I reinstalled the ESXi hosts as Proxmox Virtual Environment (PVE) nodes, and imported the existing virtual machines in the new platform. […]