Kernel Drivers

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2021-9037)

• September 1, 2021
• Linux
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🟠 High   ⏱ 15–60 min  Last verified: 1 September 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-9037 Related CVEs: CVE-2020-28374 CVE-2020-36158 CVE-2020-29569 CVE-2021-20177 CVE-2020-29660 CVE-2020-29568 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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How to Set Up Vagrant and VirtualBox on RHEL 7

• September 1, 2021
• Linux
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How to Set Up Vagrant and VirtualBox on RHEL 7 Vagrant is an open-source tool by HashiCorp that automates the creation, configuration, and management of virtualized development environments. Combined with VirtualBox as a hypervisor backend, Vagrant allows developers and operations engineers on RHEL 7 to spin up reproducible Linux (or Windows) virtual machines with a […]

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Windows Server 2016 — AD account repeatedly locked out moments after unlock — Fix & Prevention

• August 31, 2021
• Tutorials
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🟠 High   ⏱ 5–30 min  Last verified: 31 August 2021 Affected versions: Windows Server 2016 📖 ~2 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 Configure VLAN Tagging with 802.1Q on RHEL 7

• August 31, 2021
• Linux
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How to Configure VLAN Tagging with 802.1Q on RHEL 7 VLANs (Virtual Local Area Networks) allow a single physical network interface to participate in multiple logically isolated network segments simultaneously. The 802.1Q standard defines how Ethernet frames are tagged with a 12-bit VLAN ID, enabling switches and hosts to segregate traffic without requiring dedicated physical […]

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How to Configure PowerShell Just Enough Administration (JEA) on Windows Server 2012 R2

• August 30, 2021
• Tutorials
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How to Configure PowerShell Just Enough Administration (JEA) on Windows Server 2012 R2 Just Enough Administration (JEA) is a PowerShell security technology that enables role-based access to administrative functions without granting full administrator privileges. Rather than making a helpdesk technician a local administrator to restart a service, JEA creates a constrained PowerShell endpoint where the […]

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Oracle Linux 8 – Common Problem 012 – Diagnosis and Fix

• August 29, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 29 August 2021 Affected versions: Oracle Linux 8 📖 ~3 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 Kernel Updated but Old Entry Boots by Default

• August 29, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 29 August 2021 📖 ~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 Graylog on FreeBSD 12

• August 28, 2021
• FreeBSD
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Introduction How to Install Graylog on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet filtering, and […]

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Amazon Linux 2 — kernel-livepatch-4.14.252-195.483 — vulnerability — patch and remediation guide

• August 28, 2021
• Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2LIVEPATCH-2021-069 Related CVEs: CVE-2021-4002 Upstream summary: No CVE associated with this advisory Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – […]

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Ubuntu 20.04 Docker permission denied for non-root user

• August 27, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 27 August 2021 📖 ~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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