Capacity Planning

How to Configure Multi-Site Active Directory on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Multi-Site Active Directory on Windows Server 2019

Introduction to Multi-Site Active Directory Active Directory Sites and Services controls how domain controllers replicate directory information across geographically distributed locations. A properly designed multi-site AD topology ensures efficient replication between data centers, controls client login traffic so that workstations authenticate against local domain controllers rather than remote ones, and defines site link costs to […]

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Common Problems 113607

Windows Server 2012 R2 — WSUS Synchronization Stalls and New Security Updates Never Appear — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 4 December 2020 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 Install Prometheus and Grafana on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Prometheus and Grafana on Oracle Linux 8

Introduction This tutorial demonstrates how to Install Prometheus and Grafana on Oracle Linux 8 on Oracle Linux 8. 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 Oracle Linux 8 system with the […]

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How to Set Up Software RAID with mdadm on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up Software RAID with mdadm on RHEL 7

  • November 30, 2020
  • Linux
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How to Set Up Software RAID with mdadm on RHEL 7 Software RAID (Redundant Array of Independent Disks) allows you to combine multiple physical disks into a single logical device that provides redundancy, improved performance, or both — without requiring a dedicated hardware RAID controller. On RHEL 7, the mdadm utility is the standard tool […]

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How to Set Up Oracle Linux 8 in Oracle Cloud Infrastructure — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Set Up Oracle Linux 8 in Oracle Cloud Infrastructure

Introduction This tutorial demonstrates how to Set Up Oracle Linux 8 in Oracle Cloud Infrastructure on Oracle Linux 8. 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 Oracle Linux 8 system with […]

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How to Install HAProxy on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install HAProxy on Oracle Linux 8

Introduction Setting up install haproxy on oracle linux 8 on a Oracle Linux 8 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install HAProxy on Oracle Linux 8, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and […]

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How to Install Nginx on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Install Nginx on Oracle Linux 8

Introduction Oracle Linux 8 ships with a stable, security-hardened base that makes deploying install nginx on oracle linux 8 both straightforward and auditable. This tutorial covers the complete procedure for how to Install Nginx on Oracle Linux 8, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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Common Problems 117585

Ubuntu 20.04 LTS No Space Left on Device During apt Upgrade

  • November 23, 2020
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 23 November 2020 📖 ~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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Initial Server Setup with Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

Initial Server Setup with Oracle Linux 8

Introduction This tutorial demonstrates initial Server Setup with Oracle Linux 8 on Oracle Linux 8. 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 Oracle Linux 8 system with the default AppStream repositories […]

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How to Create and Manage Swap Space on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Create and Manage Swap Space on RHEL 7

  • November 22, 2020
  • Linux
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How to Create and Manage Swap Space on RHEL 7 Swap space is a designated area on disk that the Linux kernel uses as an overflow when physical RAM is exhausted. While swap is not a substitute for adequate RAM — disk I/O is orders of magnitude slower than memory access — it is a […]

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