Networking

How to Set Resource Limits with /etc/security/limits.conf on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Set Resource Limits with /etc/security/limits.conf on RHEL 10

Introduction This tutorial demonstrates how to Set Resource Limits with /etc/security/limits.conf on RHEL 10 on RHEL 10. 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 RHEL 10 system with the default AppStream […]

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Common Problems 116137

apt over IPv6 fails while IPv4 path works

🟡 Medium   ⏱ 5–30 min  Last verified: 1 July 2026 Affected versions: Ubuntu 26.04 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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Common Problems 124016

Oracle Linux 10 – NetworkManager ignores static route after restart – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 30 June 2026 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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Common Problems 115925

Ubuntu 26.04 LTS – Netplan apply fails from invalid YAML syntax – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 June 2026 Affected versions: Ubuntu 26.04 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 Configure Apache mod_security WAF on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Configure Apache mod_security WAF on RHEL 10

Introduction Setting up configure apache mod_security waf on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Configure Apache mod_security WAF on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and how to […]

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Common Problems 116122

Ubuntu 26.04 LTS – systemd-resolved stub resolver returns intermittent DNS failures – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 June 2026 Affected versions: Ubuntu 26.04 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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Common Problems 113955

RHEL 10 – Podman container cannot bind privileged port due to SELinux context

🟠 High   ⏱ 5–30 min  Last verified: 29 June 2026 Affected versions: RHEL 10 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 & […]

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Common Problems 116117

Ubuntu 26.04 LTS – chrony service not syncing after VM resume – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 29 June 2026 Affected versions: Ubuntu 26.04 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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Common Problems 115947

Ubuntu 26.04 LTS – systemd-resolved DNS lookup intermittently fails – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 June 2026 Affected versions: Ubuntu 26.04 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 Set Up a DNS Server with Bind9 on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Install Rust on Ubuntu 26.04

Rust is a systems programming language that guarantees memory safety without a garbage collector through its borrow checker. It is used for WebAssembly, operating systems, game engines, and high-performance network services. This guide installs Rust via rustup on Ubuntu 26.04 LTS. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS A user account […]

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