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How to Configure a Static IP Address with Netplan on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Install Certbot and Manage Let’s Encrypt Certificates on Ubuntu 24.04

Let’s Encrypt provides free, automated SSL/TLS certificates via the ACME protocol. Certbot is the official Let’s Encrypt client. This guide installs Certbot and manages certificates for Nginx on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Nginx installed A domain name pointed to your server Port 80 and […]

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How to Install Vagrant and VirtualBox on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Install Vagrant and VirtualBox on Ubuntu 24.04

Vagrant provides a consistent, portable development environment by automating the creation and provisioning of virtual machines. This guide installs Vagrant and VirtualBox on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS desktop or server CPU with hardware virtualisation enabled (VT-x/AMD-V) A user with sudo privileges Step 1 – Add […]

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How to Harden Nginx with Security Headers on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Harden Nginx with Security Headers on FreeBSD 14

Introduction FreeBSD 14 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up harden nginx with security headers on freebsd 14 on FreeBSD 14 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any […]

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How to Configure sudo and Sudoers on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure sudo and Sudoers on RHEL 9

The sudo (superuser do) tool allows designated users to run commands with elevated privileges without sharing the root password. This is fundamental to the principle of least privilege: each administrator gets exactly the access they need for their role, no more. When access is misconfigured — for example with blanket ALL=(ALL) ALL entries or unsafe […]

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How to Deploy a .NET Application on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Deploy a .NET Application on RHEL 9

.NET 8 is the current Long-Term Support release of Microsoft’s open-source runtime and is fully supported on RHEL 9 through Microsoft’s official package repository. ASP.NET Core applications run as self-contained processes, which makes them easy to containerise or proxy behind Nginx for production workloads. This tutorial walks through adding the Microsoft repository, installing the .NET […]

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How to Secure Nginx with Let's Encrypt SSL on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Secure Apache with Let’s Encrypt SSL on Ubuntu 24.04

This guide secures an Apache virtual host on Ubuntu 24.04 LTS with a free Let’s Encrypt SSL certificate using Certbot. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Apache installed with a virtual host configured Domain DNS A record pointing to your server Port 80 and 443 open in UFW Step […]

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Common Problems 124627

Oracle Linux 9 – Common Problem 017 – Diagnosis and Fix

🟢 Low   ⏱ 5–30 min  Last verified: 8 September 2024 Affected versions: Oracle Linux 9 📖 ~2 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]

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How to Set Up Software RAID with mdadm on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Install Zabbix 7 on Ubuntu 24.04

Zabbix 7 is an enterprise-grade open-source monitoring solution for networks, servers, and cloud services. This guide installs Zabbix Server 7.0 LTS on Ubuntu 24.04 LTS with MySQL and Nginx. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server MySQL 8.0 installed Nginx and PHP 8.3-FPM installed A user with sudo privileges Step […]

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How to Install Apache Kafka on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Install Apache Kafka on FreeBSD 14

Introduction This guide explains how to Install Apache Kafka on FreeBSD 14 on FreeBSD 14. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege […]

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Common Problems 116612

Ubuntu 24.04 LTS – certbot renew fails due to challenge and webroot mismatch

🟠 High   ⏱ 5–30 min  Last verified: 26 August 2024 Affected versions: Ubuntu 24.04 LTS Ubuntu 24.04 Ubuntu 24.04.1 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention […]

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