Backup Recovery

How to Install SQLite on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Install SQLite on FreeBSD 12

Introduction This guide explains how to Install SQLite on FreeBSD 12 on FreeBSD 12. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained privilege separation. […]

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How to Set Up BGP Routing with BIRD on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up BGP Routing with BIRD on Debian 9

Introduction This guide explains how to Set Up BGP Routing with BIRD on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install […]

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How to Configure SSH Hardening on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure SSH Hardening on Debian 9

Introduction Deploying configure ssh hardening on debian 9 on a Debian 9 Stretch machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites You will need […]

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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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Common Problems 114914

RHEL 8 systemctl Service Fails to Start After Boot

🟡 Medium   ⏱ 5–30 min  Last verified: 11 September 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 & Cross-Refs References & Further […]

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How to Configure Advanced IPAM on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Configure Advanced IPAM on Windows Server 2016

How to Configure Windows Server 2016 IPAM Advanced IP Address Management (IPAM) in Windows Server 2016 provides a centralized platform for discovering, monitoring, auditing, and managing the IP address space and DNS and DHCP servers across your network. The advanced features in Windows Server 2016 IPAM include role-based access control (RBAC), integration with System Center […]

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Common Problems 121644

Debian 9 – software RAID array stays degraded and rebuild does not start

🔴 Critical   ⏱ 5–30 min  Last verified: 10 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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Common Problems 117919

Ubuntu 18.04 LTS Netplan Misconfiguration Causes No Network

🟠 High   ⏱ 5–30 min  Last verified: 10 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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Common Problems 118990

Ubuntu 14.04 LTS NTP Drift Causes Kerberos and SSL Failures

🟠 High   ⏱ 5–30 min  Last verified: 9 September 2019 Affected versions: 14.04 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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