Capacity Planning

Common Problems 112540

Windows Server 2019 VSS Snapshot Failures Due to Low Shadow Copy Storage – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 17 May 2022 Affected versions: Windows Server 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 […]

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How to Configure LVM (Logical Volume Manager) on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure LVM (Logical Volume Manager) on RHEL 9

Logical Volume Manager (LVM) is a flexible storage management layer built into the Linux kernel that lets you create, resize, and remove storage volumes without downtime. On RHEL 9, LVM is the default storage layout used during installation and is deeply integrated with the system tooling. Unlike partitions tied directly to physical disks, LVM abstracts […]

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How to Create a Virtual Machine in Hyper-V on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Create a Virtual Machine in Hyper-V on Windows Server 2016

How to Set Up Windows Server 2016 Virtual Machine Creating and configuring virtual machines (VMs) in Windows Server 2016 Hyper-V is a fundamental skill for any system administrator. This guide provides a comprehensive walkthrough of VM creation, hardware configuration, operating system installation, and post-setup tasks using both PowerShell and Hyper-V Manager. Prerequisites Hyper-V role installed […]

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How to Configure Logrotate for Application Logs on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Logrotate for Application Logs on RHEL 7

How to Configure Logrotate for Application Logs on RHEL 7 Log files are essential for diagnosing problems and auditing system activity, but left unmanaged they will silently consume all available disk space and eventually bring a server to a halt. Logrotate is the standard tool on RHEL 7 for automating log file rotation, compression, and […]

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How to Install PostgreSQL on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install PostgreSQL on CentOS Stream 9

Introduction This tutorial demonstrates how to Install PostgreSQL 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 the default AppStream […]

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How to Set Up SSH Two-Factor Authentication on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up SSH Two-Factor Authentication on CentOS Stream 9

Introduction How to Set Up SSH Two-Factor Authentication on CentOS Stream 9 on CentOS Stream 9 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 […]

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How to Install WooCommerce on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install WooCommerce on CentOS Stream 9

Introduction How to Install WooCommerce on CentOS Stream 9 on CentOS Stream 9 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 is reproducible […]

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Common Problems 117071

Ubuntu 22.04 LTS – OOM killer terminates critical services under load – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 7 May 2022 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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How to Configure Kernel Parameters with sysctl on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure Kernel Parameters with sysctl on CentOS Stream 9

Introduction This tutorial demonstrates how to Configure Kernel Parameters with sysctl 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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Common Problems 120542

Debian 11: /var fills up due to systemd journal growth

🟠 High   ⏱ 5–30 min  Last verified: 2 May 2022 Affected versions: Debian 11 📖 ~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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