KVM (Kernel-based Virtual Machine) is a virtualization technology built into the Linux kernel that allows Linux to run multiple virtual machines (VMs) on a single physical server. KVM converts the Linux kernel into a Type-1 (bare-metal) hypervisor using CPU virtualization features.
In this blog post, I describe what KVM is and how to enable KVM on Linux Server.
Ubuntu Linux is a popular, open-source operating system based on Linux. It is designed to be easy to use, secure, and suitable for desktops, servers, and cloud environments. It is developed and maintained by Canonical Ltd.
In this blog post we will document basic Ubuntu Linux operational procedures.
Rocky Linux is an open-source, community-driven Linux distribution designed to be a bug-for-bug compatible downstream rebuild of Red Hat Enterprise Linux (RHEL). It aims to provide a stable, predictable, and enterprise-grade operating system, especially for servers and production workloads.
In this blog post we will document basic Rocky Linux operational procedures.
I'm running Mailcow mail stack for my own domain. I wrote a blog post about Mailcow install here. I have to say that it is pretty nice mailstack for my personal use. It has a significant hardware requirements (2x CPU, 4 GB RAM, 100 GB HDD) but it works pretty well and the most important is that simplicity of operations because I do not want to spend hours with mail server administration.
I recently realized, my Mailcow stack is outdated and there are available updates. I decided to make my first Mailcow update and it was pretty straightforward. Here is the procedure.
DBeaver is a free, open-source database management tool for personal projects. Manage and explore SQL databases like MySQL, MariaDB, PostgreSQL, SQLite, Apache Family, and more.
I have Ubuntu running in Virtual Machine in macOS with Apple M4 Silicon, therefore I have ARM-based Ubuntu (aarch64).
In this blog post I will show DBeaver installation install and basic usage.
I have Ubuntu OS running within VM in VMware Fusion (macOS) so expanding disk from 50 GB to 55 GB is pretty easy. Let's demonstrate the expansion process.
THIS IS NOT OPTIMAL SOLUTION, BUT I KEEP IT HERE FOR EDUCATIONAL PURPOSE.
Improved fully automated solution is documented and at https://github.com/davidpasek/blog.uw.cz/
HAProxy (short for High Availability Proxy) is an open-source software that acts as a load balancer and proxy server for TCP and HTTP-based applications. It is widely used in both small and large-scale production environments to improve performance, reliability, and scalability of web and application services.
Any L7 load balancer (reverse http proxy) nowadays is used for SSL/TLS termination and very often with combination with ACME (Automatic Certificate Management Environment).
How ACME works? Below is the simplified process ...
I use DNS-01 CA challenge, therefore integration with DNS provider is necessary. I use Active24.cz DNS provider.
For my personal load-balancer I use VM with 2 vCPUs, 2 GB RAM, 10 GB vSSD, 1x vNIC, Linux OS - Debian 13.0
If you are interested how to install and configure above solution, keep reading.
