Kernel Drivers

How to Configure AD Sites and Services on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure AD Sites and Services on Windows Server 2012 R2

How to Configure AD Sites and Services on Windows Server 2012 R2 Active Directory Sites and Services is the administrative tool used to manage the physical topology of your Active Directory infrastructure. Sites represent physical network segments or geographic locations connected by reliable, high-bandwidth links. The Sites and Services configuration drives replication scheduling, client site […]

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How to Take ZFS Snapshots on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Take ZFS Snapshots on FreeBSD 13

Introduction How to Take ZFS Snapshots on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet filtering, […]

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How to Configure Automatic Security Updates on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure Automatic Security Updates on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying configure automatic security updates on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure Automatic Security Updates on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]

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Common Problems 117500

Ubuntu 20.04 LTS Excessive Swap Usage Causes Slowness

🟡 Medium   ⏱ 5–30 min  Last verified: 11 January 2022 📖 ~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 Configure Disk Quotas on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure Disk Quotas on FreeBSD 13 (FREEBSD-13-2)

Introduction How to Configure Disk Quotas on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet filtering, […]

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How to Configure Windows Server 2019 with Nagios — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Windows Server 2019 with Nagios

How to Configure Windows Server 2019 with Nagios Nagios is a widely-used open-source infrastructure monitoring platform that can monitor Windows Server 2019 hosts for availability, performance, and service health. Integration is achieved through the NSClient++ agent installed on Windows servers, which responds to Nagios check commands over NRPE (Nagios Remote Plugin Executor) or NSCP protocol. […]

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Common Problems 125093

Oracle Linux 8 – Common Problem 013 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 9 January 2022 Affected versions: Oracle Linux 8 📖 ~3 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 115003

RHEL 8 XFS filesystem remounts read-only after metadata error

🟡 Medium   ⏱ 5–30 min  Last verified: 9 January 2022 📖 ~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 Configure Network Load Balancing (NLB) on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Network Load Balancing (NLB) on Windows Server 2019

Introduction to Network Load Balancing on Windows Server 2019 Network Load Balancing (NLB) is a built-in Windows Server 2019 feature that distributes incoming TCP/IP traffic across multiple servers to improve scalability and availability for stateless applications. NLB is commonly used for web server farms, Remote Desktop Session Host farms, VPN gateways, and Terminal Services. Unlike […]

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Common Problems 118992

Ubuntu 14.04 LTS swap thrashing causes severe performance degradation

🟠 High   ⏱ 5–30 min  Last verified: 8 January 2022 Affected versions: 14.04 📖 ~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 […]

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