How To Tech BlogUseful documentation for everyone! Practical guides, system administration, security, and AI-driven research.https://blog.andre.systems/Install CentOS 8 (and 2026 RHEL Alternatives: Rocky Linux 9 & AlmaLinux 9)https://blog.andre.systems/install-centos-8/https://blog.andre.systems/install-centos-8/Step-by-step visual guide to installing CentOS 8 on a virtual machine, modernized for 2026 with AlmaLinux 9, Rocky Linux 9, and automated Kickstart deployments.Sat, 18 Apr 2020 00:00:00 GMTBuild a Domain Controller on Windows Server 2016 (with 2026 PowerShell & Server 2025 Guide)https://blog.andre.systems/build-a-domain-controller-on-server-2016/https://blog.andre.systems/build-a-domain-controller-on-server-2016/Visual guide to promoting a Windows Server 2016 machine to an Active Directory Domain Controller, updated with automated PowerShell deployment for Windows Server 2022/2025.Fri, 17 Apr 2020 00:00:00 GMTAutomate Updates on Windows Server 2019 (Group Policy & Modern Cloud Patching)https://blog.andre.systems/automate-updates-on-windows-server-2019/https://blog.andre.systems/automate-updates-on-windows-server-2019/How to automate Windows Updates and Defender definition updates on Windows Server 2019 using Local Group Policy, plus modern PowerShell and Azure Update Manager workflows.Sat, 15 Feb 2020 00:00:00 GMTHow to Create a Hyper-V VM via PowerShell (with Modern Automated Provisioning)https://blog.andre.systems/how-to-create-a-vm-via-powershell/https://blog.andre.systems/how-to-create-a-vm-via-powershell/Learn how to create and configure Generation 2 Hyper-V virtual machines, virtual hard disks, CPU, SecureBoot, and networking using Windows PowerShell.Tue, 14 Jan 2020 00:00:00 GMTHow to Import Ed25519 Keys for Use in PuTTY on Windows (Plus Native Windows OpenSSH)https://blog.andre.systems/how-to-import-ed25519-keys-for-use-in-putty-on-windows/https://blog.andre.systems/how-to-import-ed25519-keys-for-use-in-putty-on-windows/Step-by-step tutorial on converting OpenSSH Ed25519 private keys to PuTTY .ppk format using PuTTYgen, plus how to use native OpenSSH in Windows 11.Sun, 24 Nov 2019 00:00:00 GMTHow to Generate and Install Ed25519 SSH Keys on Linux (with 2026 FIDO2 Hardware Key Guide)https://blog.andre.systems/how-to-generate-and-install-ed25519-ssh-keys-on-linux-centos-7/https://blog.andre.systems/how-to-generate-and-install-ed25519-ssh-keys-on-linux-centos-7/Learn how to generate Ed25519 SSH key pairs and deploy them to Linux servers using ssh-copy-id, plus modern FIDO2/YubiKey (ed25519-sk) and sshd hardening.Sat, 23 Nov 2019 00:00:00 GMT