Capacity Planning

How to Perform Disaster Recovery Testing on Windows Server 2025 — step-by-step Windows Server 2025 tutorial on Progressive Robot

How to Perform Disaster Recovery Testing on Windows Server 2025

How to Perform Disaster Recovery Testing on Windows Server 2025 A disaster recovery plan that has never been tested is not a plan — it is a hypothesis. The uncomfortable truth that most IT organizations discover only during an actual disaster is that DR documentation written six months ago may not account for new servers, […]

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Common Problems 116569

Ubuntu 24.04 LTS Apache2 with PHP-FPM Returns 503 Backend Unavailable

🟡 Medium   ⏱ 5–30 min  Last verified: 20 October 2024 📖 ~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 116582

Ubuntu 24.04 LTS – /var filesystem full breaks package and service operations

🔴 Critical   ⏱ 5–30 min  Last verified: 8 October 2024 Affected versions: Ubuntu 24.04 LTS Ubuntu 24.04 Ubuntu 24.04.1 📖 ~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 116443

Ubuntu 24.04 LTS – snapd service fails and snap applications do not launch

🟠 High   ⏱ 5–30 min  Last verified: 8 October 2024 Affected versions: Ubuntu 24.04 LTS Ubuntu 24.04 Ubuntu 24.04.1 📖 ~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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How to Install InfluxDB and Telegraf on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install InfluxDB and Telegraf on RHEL 9

InfluxDB 2.x is a purpose-built time-series database that excels at storing high-cardinality metrics with millisecond precision, while Telegraf is its companion agent that collects metrics from hundreds of input plugins and writes them directly to InfluxDB. Together they form the “TIG stack” backbone when paired with Grafana for visualisation. On RHEL 9, both packages are […]

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Common Problems 120096

Debian 12 High I/O Wait Caused by Swap Thrashing

🟠 High   ⏱ 5–30 min  Last verified: 8 September 2024 Affected versions: Debian 12 📖 ~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 117081

Ubuntu 22.04 LTS – journalctl disk usage grows rapidly and fills root filesystem – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 8 September 2024 Affected versions: Ubuntu 22.04 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 114530

Disk Space Not Recovered After Deleting Large Log Files

🟡 Medium   ⏱ 5–30 min  Last verified: 31 August 2024 📖 ~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 LUKS Disk Encryption on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up LUKS Disk Encryption on CentOS Stream 9

Introduction This tutorial demonstrates how to Set Up LUKS Disk Encryption on CentOS Stream 9 on CentOS Stream 9. 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 CentOS Stream 9 system with […]

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How to Install VictoriaMetrics as a Prometheus Alternative on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install VictoriaMetrics as a Prometheus Alternative on RHEL 9

VictoriaMetrics is a high-performance, open-source time-series database and monitoring solution that is fully compatible with the Prometheus query API. It offers significantly better data compression, faster ingestion rates, and lower memory consumption compared to Prometheus, making it an attractive choice for large or long-retention deployments. On RHEL 9 you can run VictoriaMetrics as a drop-in […]

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