Networking

How to Set Up PostgreSQL Streaming Replication on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up PostgreSQL Streaming Replication on FreeBSD 12

Introduction This guide explains how to Set Up PostgreSQL Streaming Replication on FreeBSD 12 on FreeBSD 12. 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 […]

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How to Configure Network QoS with tc on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Network QoS with tc on RHEL 8

Quality of Service (QoS) with the Linux traffic control subsystem (tc) gives you precise control over bandwidth allocation, latency, and scheduling for network interfaces on RHEL 8. Using the Hierarchical Token Bucket (HTB) queuing discipline you can guarantee minimum bandwidth to critical services, cap bandwidth for bulk transfers, and prioritize interactive traffic over background workloads. […]

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Common Problems 118002

UFW Blocks Expected Service Traffic

🟡 Medium   ⏱ 5–30 min  Last verified: 14 March 2021 📖 ~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 115636

firewalld Blocking Required Application Port – RHEL 7 Post 107

🟡 Medium   ⏱ 5–30 min  Last verified: 14 March 2021 📖 ~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 113415

Windows Server 2012 R2 — Split-brain DNS returns incorrect internal host records for hybrid workloads — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 14 March 2021 Affected versions: Windows Server 2012 R2 📖 ~2 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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How to Configure Redis Sentinel on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Redis Sentinel on Oracle Linux 8

Introduction This tutorial demonstrates how to Configure Redis Sentinel on Oracle Linux 8 on Oracle Linux 8. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 8 system with the default […]

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How to Install Xdebug for PHP on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install Xdebug for PHP on FreeBSD 12

Introduction How to Install Xdebug for PHP on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]

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How to Configure Oracle Linux 8 for Edge Computing — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Oracle Linux 8 for Edge Computing

Introduction Setting up configure oracle linux 8 for edge computing on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure Oracle Linux 8 for Edge Computing, with all the commands you need, the SELinux and firewalld considerations to keep in […]

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Common Problems 118502

Ubuntu 16.04 Interface Fails to Come Up After /etc/network/interfaces Edit

🟡 Medium   ⏱ 5–30 min  Last verified: 12 March 2021 📖 ~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 115109

RHEL 8 – Postfix Mail Queue Stalls from DNS Resolver Problems

🟡 Medium   ⏱ 5–30 min  Last verified: 12 March 2021 📖 ~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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