Firewall

Common Problems 115414

YUM Fails Due to DNS Resolution Problems

🟡 Medium   ⏱ 5–30 min  Last verified: 6 September 2019 📖 ~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 Install Rust with rustup on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Rust with rustup on Debian 9

Introduction This guide explains how to Install Rust with rustup 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 […]

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Common Problems 115632

RHEL 7 firewalld Direct Rules Lost After Reload

🟡 Medium   ⏱ 5–30 min  Last verified: 4 September 2019 Affected versions: RHEL 7 📖 ~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 115081

RHEL 8 Cockpit Web Console Unreachable After Firewall Policy Change

🟡 Medium   ⏱ 5–30 min  Last verified: 4 September 2019 📖 ~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 Hyper-V on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up Hyper-V on Windows Server 2012 R2

How to Set Up Hyper-V on Windows Server 2012 R2 Hyper-V is Microsoft’s Type-1 hypervisor, shipping as a role in Windows Server 2012 R2. It enables hardware virtualisation directly on the server, allowing you to run multiple virtual machines (VMs) with different operating systems on the same physical hardware. Windows Server 2012 R2 Hyper-V includes […]

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How to Monitor Windows Server 2016 with Grafana and InfluxDB — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Monitor Windows Server 2016 with Grafana and InfluxDB

How to Set Up Windows Server 2016 with Grafana Grafana is an open-source observability and visualization platform that creates rich, interactive dashboards from diverse data sources including Prometheus, InfluxDB, Elasticsearch, and many others. While Grafana itself is not a monitoring agent, it serves as the visualization and alerting layer when combined with a metrics collection […]

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How to Configure sudo for Non-Root Users on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure sudo for Non-Root Users on FreeBSD 12

Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure sudo for non-root users on freebsd 12 on FreeBSD 12 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 PostgreSQL Remote Access and SSL on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure PostgreSQL Remote Access and SSL on RHEL 7

How to Configure PostgreSQL Remote Access and SSL on RHEL 7 By default, PostgreSQL on RHEL 7 only accepts connections from localhost and rejects all remote clients. For multi-tier applications where the web or application server runs on a separate host from the database, you need to explicitly open PostgreSQL to remote connections — and […]

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How to Deploy a Django Application with Gunicorn and Nginx on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Deploy a Django Application with Gunicorn and Nginx on RHEL 8

Django is one of the most popular Python web frameworks, and deploying it in production requires more than the built-in development server. The recommended production stack on RHEL 8 pairs Django with Gunicorn as the WSGI application server and Nginx as a reverse proxy that handles static files, TLS termination, and connection management. This tutorial […]

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