DNS

How to Configure System Center Operations Manager on Windows Server 2016

• August 27, 2019
• Tutorials
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How to Set Up Windows Server 2016 Operations Manager System Center Operations Manager (SCOM) is Microsoft’s enterprise monitoring platform for Windows Server, Linux, network devices, and applications. SCOM uses management packs containing pre-built knowledge about specific technologies to automatically discover components, apply monitoring rules, generate alerts, and produce performance data. Deployed on Windows Server 2016, […]

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Ubuntu 18.04 End of Standard Support Upgrade Planning Gaps

• August 26, 2019
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 26 August 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 Docker Daemon TLS on FreeBSD 12

• August 26, 2019
• FreeBSD
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Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up configure docker daemon tls on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux […]

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How to Restrict Kernel Module Loading on Debian 9

• August 26, 2019
• Linux
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Introduction How to Restrict Kernel Module Loading on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 9. […]

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How to Configure Windows Server Software-Defined Networking (SDN) on Windows Server 2019

• August 26, 2019
• Tutorials
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Introduction to Software-Defined Networking on Windows Server 2019 Software-Defined Networking (SDN) in Windows Server 2019 provides a programmable network infrastructure that decouples network configuration from the underlying hardware. Windows Server 2019 SDN, part of the Microsoft SDN stack, includes Network Controller (NC), Software Load Balancer (SLB), Windows Server Gateway (WSG), and Hyper-V Network Virtualisation (HNV). […]

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Ubuntu 16.04 LTS – sudo fails due to incorrect /etc/sudoers permissions – Fix & Prevention

• August 25, 2019
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 25 August 2019 Affected versions: Ubuntu 16.04 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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RHEL 8 sudo Fails When SSSD or Identity Provider Is Unavailable

• August 25, 2019
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 25 August 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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Ubuntu 14.04 LTS – DHCP lease not renewing causes network loss – Fix & Prevention

• August 24, 2019
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 24 August 2019 Affected versions: Ubuntu 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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NO_PUBKEY Error for Third-Party apt Repository

• August 24, 2019
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 24 August 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 Install Gradle Build Tool on Debian 9

• August 24, 2019
• Linux
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Introduction This guide explains how to Install Gradle Build Tool 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 with the […]

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