Capacity Planning

How to Configure Patch Management with WSUS on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Patch Management with WSUS on Windows Server 2016

How to Set Up Windows Server 2016 Patch Management with WSUS Windows Server Update Services (WSUS) is Microsoft’s free server role that enables administrators to manage the distribution of updates released through Microsoft Update to computers in a network. Rather than having each server and workstation download updates directly from Microsoft, WSUS downloads updates once […]

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How to Set Up System Center Operations Manager (SCOM) on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up System Center Operations Manager (SCOM) on Windows Server 2019

Introduction to System Center Operations Manager System Center Operations Manager (SCOM) is Microsoft’s enterprise monitoring platform designed for large-scale Windows environments. It uses management packs — extensible plug-ins — to provide out-of-the-box monitoring intelligence for Windows Server operating systems, SQL Server, IIS, Active Directory, Hyper-V, and hundreds of third-party applications. SCOM uses agents deployed to […]

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How to Set Up DHCP Failover on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up DHCP Failover on Windows Server 2019

Introduction to DHCP Failover on Windows Server 2019 DHCP Failover allows two Windows Server 2019 DHCP servers to share address assignment responsibility for a scope, providing high availability and load balancing for IP address leasing. Without failover, a single DHCP server failure means clients cannot renew leases or obtain new ones — which causes network […]

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Common Problems 118059

Ubuntu 18.04 LTS Apache 503 Service Unavailable Under Load

🟠 High   ⏱ 5–30 min  Last verified: 11 September 2019 Affected versions: 18.04 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 Monitor Windows Server 2012 R2 with Performance Monitor — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Monitor Windows Server 2012 R2 with Performance Monitor

How to Monitor Windows Server 2012 R2 with Performance Monitor Performance Monitor (PerfMon) is the built-in diagnostic tool in Windows Server 2012 R2 for collecting, analysing, and logging performance data from the operating system, hardware, and applications. It provides real-time graphing of hundreds of performance counters covering CPU, memory, disk, network, and application-specific metrics. When […]

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How to Configure SLB MUX on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure SLB MUX on Windows Server 2016

How to Configure Windows Server 2016 SLB MUX The Software Load Balancer (SLB) Multiplexer (MUX) is a core component of the Windows Server 2016 SDN stack that provides inbound network address translation and load balancing for virtual IP (VIP) addresses. The SLB MUX runs as a virtual machine on the SDN fabric and works in […]

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How to Set Up a LEMP Stack on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up a LEMP Stack on RHEL 7

How to Set Up a LEMP Stack on RHEL 7 A LEMP stack — Linux, Nginx, MySQL, and PHP — is one of the most common foundations for modern dynamic web applications. On RHEL 7 the individual components are available from a combination of the base repositories, the EPEL community repository, the official MySQL community […]

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Common Problems 119031

Ubuntu 14.04 LTS Apache returns 503 Service Unavailable under peak load

🟠 High   ⏱ 5–30 min  Last verified: 8 September 2019 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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Common Problems 113622

Windows Server 2012 R2 Write Cache Policy Disabled Reducing Array Write Performance – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 7 September 2019 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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Common Problems 121709

Debian 9 Logrotate Not Rotating Application Logs

🟡 Medium   ⏱ 5–30 min  Last verified: 5 September 2019 Affected versions: Debian 9 📖 ~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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