Capacity Planning

How to Configure DRBD for High Availability on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure DRBD for High Availability on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying configure drbd for high availability on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Configure DRBD for High Availability on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the […]

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

How to Install HAProxy on CentOS Stream 9

Introduction How to Install HAProxy 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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How to Set Up OpenVPN on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up OpenVPN on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying set up openvpn on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Set Up OpenVPN on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

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How to Set Up MySQL with SSL on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up MySQL with SSL on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying set up mysql with ssl on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Set Up MySQL with SSL on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the […]

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Common Problems 117492

Ubuntu 20.04 LTS – disk full under /var/log causes service failures – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 17 January 2022 Affected versions: Ubuntu 20.04 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 119101

Ubuntu 14.04 LTS PHP-FPM workers exhausted causing 502 Bad Gateway

🟠 High   ⏱ 5–30 min  Last verified: 14 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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How to Write Advanced PowerShell Scripts for Windows Server 2016 Administration — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Write Advanced PowerShell Scripts for Windows Server 2016 Administration

Introduction Advanced PowerShell scripting transforms Windows Server 2016 administration from a manual, time-intensive process into a streamlined, automated workflow. This guide covers advanced scripting patterns, error handling, modules, and real-world automation scenarios every Windows Server 2016 administrator should master. PowerShell Execution Policy and Script Signing Before deploying advanced scripts, configure an appropriate execution policy and […]

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How to Configure Windows Server 2019 Initial Settings — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Windows Server 2019 Initial Settings

How to Configure Windows Server 2019 Initial Settings After installing Windows Server 2019, several initial configuration tasks must be completed before the server is ready for production use. This includes setting the hostname, assigning a static IP address, configuring the time zone, joining a domain, enabling remote management, and setting up basic security policies. Completing […]

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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 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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