Firewall

How to Install Ruby with rbenv on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install Ruby with rbenv on Debian 13

Introduction Deploying install ruby with rbenv on a Debian 13 Trixie 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 Ensure Debian 13 Trixie is […]

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Common Problems 114539

Intermittent DNS Resolution Failures On RHEL 9

🟡 Medium   ⏱ 5–30 min  Last verified: 30 August 2025 📖 ~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 Set Up a Static IP Address with Netplan on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Set Up a Static IP Address with Netplan on Debian 13

Introduction How to Set Up a Static IP Address with Netplan on Debian 13 is a fundamental operation for any administrator maintaining a Debian 13 Trixie server. Debian 13 Trixie 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 […]

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How to Set Up StrongSwan IPsec on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Set Up StrongSwan IPsec on Oracle Linux 10

Introduction Setting up set up strongswan ipsec on oracle linux 10 on a Oracle Linux 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Set Up StrongSwan IPsec on Oracle Linux 10, with all the commands you need, the SELinux and firewalld considerations to […]

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Common Problems 124114

Oracle Linux 10 – NFS exports inaccessible due to firewalld zone mismatch – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 August 2025 Affected versions: Oracle Linux 10 📖 ~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 Create a Custom systemd Service Unit on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Create a Custom systemd Service Unit on RHEL 10

Introduction Setting up create a custom systemd service unit on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Create a Custom systemd Service Unit on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in […]

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How to Configure Kerberos on Oracle Linux 10 — step-by-step Oracle Linux 10 tutorial on Progressive Robot

How to Configure Kerberos on Oracle Linux 10

Introduction How to Configure Kerberos on Oracle Linux 10 on Oracle Linux 10 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 reproducible […]

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How to Configure Squid Proxy on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Squid Proxy on Debian 13

Introduction Deploying configure squid proxy on a Debian 13 Trixie 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 Ensure Debian 13 Trixie is fully […]

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How to Use Docker Compose on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Use Docker Compose on Debian 13

Introduction This guide explains how to Use Docker Compose on Debian 13 on Debian 13 Trixie. Debian Trixie 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 13 install with the standard […]

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Common Problems 113960

RHEL 10 – firewalld rich rule does not persist across reboot – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 August 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 & Hardening Related […]

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