DNS

How to Install HAProxy on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install HAProxy on Oracle Linux 8

Introduction Setting up install haproxy on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install HAProxy on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and […]

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How to Configure Drone CI on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Drone CI on Debian 9

Introduction This guide explains how to Configure Drone CI 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 […]

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How to Configure DHCP Policies on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure DHCP Policies on Windows Server 2019

Introduction to DHCP Policies on Windows Server 2019 DHCP Policies allow the Windows Server 2019 DHCP server to assign different configuration options — including IP address ranges, lease durations, default gateways, DNS servers, and custom options — to clients based on attributes of the DHCP request itself. Without policies, all clients in a scope receive […]

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Common Problems 115508

RHEL 7 Cron Job Runs but Script Fails Under SELinux

🟡 Medium   ⏱ 5–30 min  Last verified: 27 November 2020 📖 ~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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Common Problems 115077

systemd-resolved Not Used and DNS Queries Intermittently Fail

🟡 Medium   ⏱ 5–30 min  Last verified: 27 November 2020 📖 ~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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Common Problems 117488

Ubuntu 20.04 LTS – GRUB rescue prompt shows unknown filesystem

🔴 Critical   ⏱ 5–30 min  Last verified: 26 November 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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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Common Problems 121511

Debian 9 – Network Interface Rename Breaks Connectivity – Persistent Naming Fix

🟠 High   ⏱ 5–30 min  Last verified: 25 November 2020 Affected versions: Debian 9 📖 ~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 Configure Docker Networks on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Docker Networks on Debian 9

Introduction Deploying configure docker networks on debian 9 on a Debian 9 Stretch 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 begin, […]

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Common Problems 118939

Ubuntu 14.04 LTS DNS Resolution Intermittently Fails

🟡 Medium   ⏱ 5–30 min  Last verified: 24 November 2020 Affected versions: 14.04 LTS 📖 ~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 Install Nginx on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Nginx on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying install nginx on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Install Nginx on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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