Kernel Drivers

How to Set Up borgbackup on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up borgbackup on Debian 9

Introduction How to Set Up borgbackup 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. This […]

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Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2022-7110)

🟠 High   ⏱ 15–60 min  Last verified: 8 July 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-7110 Related CVEs: CVE-2022-23816 CVE-2022-2588 CVE-2022-23825 CVE-2022-29901 CVE-2022-1353 CVE-2022-29900 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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Common Problems 117611

Ubuntu 20.04 LTS – PHP-FPM pool crashes under load with memory limit issues – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 7 July 2021 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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How to Set Up WireGuard VPN on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Set Up WireGuard VPN on FreeBSD 12 (FREEBSD-12-2)

Introduction How to Set Up WireGuard VPN 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 […]

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FreeBSD 13 — FreeBSD-kernel — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — FreeBSD-kernel — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 6 July 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: FreeBSD — Missing validation in ptrace(PT_SC_REMOTE) Related CVEs: CVE-2004-0230 CVE-2013-3077 CVE-2013-4851 CVE-2013-5209 CVE-2014-1453 CVE-2014-3000 CVE-2014-3711 CVE-2014-3873  +12 more Upstream summary: Problem Description: ptrace(PT_SC_REMOTE) failed to properly validate parameters for the […]

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Common Problems 125173

Oracle Linux 8 – Common Problem 021 – Diagnosis and Fix

🟡 Medium   ⏱ 5–30 min  Last verified: 5 July 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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How to Monitor System Resources with htop, top and vmstat on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Monitor System Resources with htop, top and vmstat on RHEL 7

How to Monitor System Resources with htop, top and vmstat on RHEL 7 Effective system monitoring is the foundation of proactive administration. Whether you are troubleshooting a performance complaint, capacity planning for a growing workload, or simply verifying that a server is running within normal parameters, having command-line resource monitoring tools at your fingertips is […]

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How to Upgrade FreeBSD 13 to FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Upgrade FreeBSD 13 to FreeBSD 13

Introduction How to Upgrade FreeBSD 13 to FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 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, […]

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Common Problems 118597

Ubuntu 16.04 LTS CIFS network share fails to mount at boot

🟡 Medium   ⏱ 5–30 min  Last verified: 2 July 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 Configure the System Timezone on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure the System Timezone on FreeBSD 13

Introduction How to Configure the System Timezone on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 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 […]

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