How To Use the cloud provider’s DNS For Custom GitHub URLs
This tutorial shows how to setup a DNS redirection from your own custom domain to point to your GitHub-hosted static website using the cloud provider’s DNS control panel.
Ubuntu 16.04 LTS UFW Rules Block Return Traffic
🟡 Medium ⏱ 5–30 min Last verified: 29 January 2021 Affected versions: 16.04 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 & […]
RHEL 7 systemctl Service Restart Loop Triggered by OOM Kills
🟠 High ⏱ 5–30 min Last verified: 29 January 2021 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 & […]
How to Use Docker Volumes and Bind Mounts on RHEL 8
Persistent data is one of the most important concerns when running containers, since a container’s writable layer is destroyed when the container is removed. Docker provides three storage mechanisms to address this: named volumes managed by Docker itself, bind mounts that link a host directory directly into a container, and tmpfs mounts for ephemeral in-memory […]
snapd Installation or Refresh Failures on Ubuntu 16.04
🟡 Medium ⏱ 5–30 min Last verified: 28 January 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 […]
Ubuntu 18.04 LTS sudoers misconfiguration locks out admin privileges
🟡 Medium ⏱ 5–30 min Last verified: 28 January 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 […]
Ubuntu 20.04 LTS Swap Thrashing Under Memory Pressure
🟠 High ⏱ 5–30 min Last verified: 28 January 2021 Affected versions: 20.04 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 & […]
How to Configure OPcache for PHP on Oracle Linux 8
Introduction How to Configure OPcache for PHP on Oracle Linux 8 on Oracle Linux 8 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 […]
Ubuntu 14.04 LTS – network interface naming changes break startup scripts – Fix & Prevention
🟡 Medium ⏱ 5–30 min Last verified: 27 January 2021 Affected versions: Ubuntu 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 […]
RHEL 8 – Kernel Update Ends in Dracut Emergency Shell
🟡 Medium ⏱ 5–30 min Last verified: 27 January 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 […]
