Boot Startup

How to Create Custom SRC Subsystems on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Create Custom SRC Subsystems on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to create custom src subsystems on ibm aix 7.2 on […]

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How to Perform a CIS Benchmark Audit on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Perform a CIS Benchmark Audit on Debian 11

Introduction How to Perform a CIS Benchmark Audit on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 […]

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How to Use Lynis Security Auditing on IBM AIX 7.3 — step-by-step IBM AIX 7.3 tutorial on Progressive Robot

How to Use Lynis Security Auditing on IBM AIX 7.3

Introduction IBM AIX 7.3 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.3 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to use lynis security auditing on IBM AIX 7.3 with […]

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Common Problems 115605

RHEL 7 Custom systemctl Unit Restart Loop

🟠 High   ⏱ 5–30 min  Last verified: 28 August 2022 Affected versions: RHEL 7 📖 ~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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Oracle Linux 8 — grub2 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — grub2 — vulnerability — patch and remediation guide (ELSA-2022-9595)

🟠 High   ⏱ 15–60 min  Last verified: 28 August 2022 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-9595 Related CVEs: CVE-2021-3696 CVE-2022-28737 CVE-2022-28734 CVE-2022-28735 CVE-2022-28736 CVE-2021-3697 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 Configure Network QoS with tc on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure Network QoS with tc on RHEL 9

Network Quality of Service (QoS) lets you control how bandwidth is distributed across different types of traffic, ensuring that latency-sensitive applications like VoIP or interactive SSH sessions remain responsive even when bulk transfers saturate the link. The Linux tc (traffic control) subsystem implements this through a combination of queuing disciplines, classes, and packet filters. This […]

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How to Set Up Dovecot IMAP Server on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up Dovecot IMAP Server on Debian 11

Introduction Deploying set up dovecot imap server on debian 11 on a Debian 11 Bullseye 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 Before […]

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How to Mount Cloud Object Storage on IBM AIX 7.3 — step-by-step IBM AIX 7.3 tutorial on Progressive Robot

How to Mount Cloud Object Storage on IBM AIX 7.3

Introduction IBM AIX 7.3 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.3 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to mount cloud object storage on IBM AIX 7.3 with […]

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Common Problems 120491

Debian 11 – GRUB Rescue Prompt After Kernel Update – Restore Bootability

🔴 Critical   ⏱ 5–30 min  Last verified: 27 August 2022 Affected versions: Debian 11 📖 ~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 Snapshots with LVM on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up Snapshots with LVM on Debian 11

Introduction How to Set Up Snapshots with LVM on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 […]

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