DNS

How to Install Nginx on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Nginx on Debian 9 (DEBIAN-9-2)

Introduction This guide explains how to Install Nginx on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with the standard repositories […]

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How to Set Up GlusterFS Distributed Storage on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up GlusterFS Distributed Storage on Debian 11

Introduction This guide explains how to Set Up GlusterFS Distributed Storage on Debian 11 on Debian 11 Bullseye. Debian Bullseye uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 11 install with […]

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How to Configure Redis Cluster on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure Redis Cluster on CentOS Stream 9

Introduction How to Configure Redis Cluster on CentOS Stream 9 on CentOS Stream 9 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]

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Common Problems 120489

Debian 11 APT Update Fails with NO_PUBKEY Errors

🟡 Medium   ⏱ 5–30 min  Last verified: 4 April 2022 Affected versions: Debian 11 📖 ~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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How to Set Up Riemann Event Stream Processor on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up Riemann Event Stream Processor on Debian 9

Introduction This guide explains how to Set Up Riemann Event Stream Processor on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install […]

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How to Install Kotlin and Set Up a JVM Project on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Install Kotlin and Set Up a JVM Project on Debian 11

Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up install kotlin and set up a jvm project on debian 11 on Bullseye leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bullseye freeze. Follow […]

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Common Problems 120673

Debian 11: certbot renewal fails because web server port is occupied

🟠 High   ⏱ 5–30 min  Last verified: 3 April 2022 Affected versions: Debian 11 📖 ~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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How to Set Up MariaDB Replication on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up MariaDB Replication on Debian 11

Introduction How to Set Up MariaDB Replication on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 11. […]

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How to Write Ansible Playbooks for Debian 11 Systems — step-by-step Debian 11 tutorial on Progressive Robot

How to Write Ansible Playbooks for Debian 11 Systems

Introduction Deploying write ansible playbooks for debian 11 systems on a Debian 11 Bullseye machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Before you […]

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How to Configure iptables Firewall Rules on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure iptables Firewall Rules on RHEL 7

How to Configure iptables Firewall Rules on RHEL 7 RHEL 7 ships with firewalld as the default firewall management layer, but many system administrators prefer to work directly with iptables, the underlying Linux netfilter framework. iptables provides precise, stateful packet filtering through a chain-based rule system and is the right choice when you need fine-grained […]

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