Networking

How to Configure Apache2 MPM Worker on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Configure Apache2 MPM Worker on Debian 12

Introduction How to Configure Apache2 MPM Worker on Debian 12 is a fundamental operation for any administrator maintaining a Debian 12 Bookworm server. Debian 12 Bookworm ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 12. […]

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How to Set Up SSH Key Authentication on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Set Up SSH Key Authentication on Debian 12

Introduction Debian 12 Bookworm is built around the ethos of stability and free software. Setting up set up ssh key authentication on debian 12 on Bookworm leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bookworm freeze. Follow each step carefully […]

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How to Install VictoriaMetrics as a Prometheus Alternative on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install VictoriaMetrics as a Prometheus Alternative on RHEL 9

VictoriaMetrics is a high-performance, open-source time-series database and monitoring solution that is fully compatible with the Prometheus query API. It offers significantly better data compression, faster ingestion rates, and lower memory consumption compared to Prometheus, making it an attractive choice for large or long-retention deployments. On RHEL 9 you can run VictoriaMetrics as a drop-in […]

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How to Set Up WireGuard VPN on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Set Up WireGuard VPN on FreeBSD 14 (ON-FREEBSD-14)

Introduction This guide explains how to Set Up WireGuard VPN 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 […]

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Common Problems 122692

NFS Mounts Intermittently Freeze Applications

🟠 High   ⏱ 5–30 min  Last verified: 25 January 2024 Affected versions: FreeBSD 14 📖 ~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 & Hardening Related Errors & […]

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Common Problems 114593

RHEL 9 dnf download failures behind enterprise proxy

🟡 Medium   ⏱ 5–30 min  Last verified: 23 January 2024 📖 ~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 & Hardening Related Errors & Cross-Refs References & Further […]

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How to Manage Systemd Services and Units on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Manage Systemd Services and Units on RHEL 9

Systemd is the init system and service manager for RHEL 9 — it is PID 1, the parent of every other process on the system. Understanding how to manage systemd services is foundational to every other administrative task: installing Nginx means enabling the nginx service; configuring a database means understanding its unit file; debugging a […]

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Common Problems 114450

SELinux Denial Prevents Service Operation

🟡 Medium   ⏱ 5–30 min  Last verified: 17 January 2024 📖 ~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 & Hardening Related Errors & Cross-Refs References & Further […]

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How to Configure OpenVPN Server on FreeBSD 14 — step-by-step FreeBSD 14 tutorial on Progressive Robot

How to Configure OpenVPN Server on FreeBSD 14

Introduction This guide explains how to Configure OpenVPN Server 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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