Backup Recovery

Common Problems 118568

Nginx fails to reload due to duplicate server_name

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 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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Common Problems 115637

firewalld Blocks Required Application Port – RHEL 7 Post 133

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 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 NFS Server and Client on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up NFS Server and Client on Debian 9

Introduction How to Set Up NFS Server and Client on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch 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 differ from […]

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How to Configure Managed Service Accounts on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure Managed Service Accounts on Windows Server 2012 R2

How to Configure Managed Service Accounts on Windows Server 2012 R2 Managed Service Accounts (MSAs) were introduced in Windows Server 2008 R2 to address the operational challenges of managing traditional service account passwords. An MSA is a special type of domain account whose password is automatically managed by Active Directory — the password is a […]

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Common Problems 118408

Hash Sum Mismatch on apt update

🟡 Medium   ⏱ 5–30 min  Last verified: 25 October 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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Common Problems 117951

Ubuntu 18.04 DNS Resolution Fails Intermittently

🟡 Medium   ⏱ 5–30 min  Last verified: 25 October 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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Common Problems 113572

Windows Server 2012 R2 Tiered Storage Spaces Not Rebalancing Hot Data Correctly – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 24 October 2019 Affected versions: Windows Server 2012 R2 📖 ~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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How to Set Up PowerHA Geographic Mirroring on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Set Up PowerHA Geographic Mirroring on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to set up powerha geographic mirroring on ibm aix 7.1 […]

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How to Configure LVM on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure LVM on RHEL 7

How to Configure LVM on RHEL 7 Logical Volume Manager (LVM) is one of the most powerful storage management tools available on Linux. Unlike traditional partitioning, LVM introduces an abstraction layer between physical storage devices and the file systems that use them, enabling administrators to resize volumes online, create snapshots for consistent backups, and pool […]

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How to Automate Backups with rsync and cron on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Automate Backups with rsync and cron on RHEL 8

Reliable backups are the last line of defense against data loss from hardware failures, ransomware, or accidental deletion, and on RHEL 8 the combination of rsync and cron provides a powerful, scriptable, and dependency-free backup pipeline. rsync is a fast incremental file-transfer utility that only copies changed data, making it efficient for both local and […]

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