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Core Java Tutorial — step-by-step Programming tutorial on Progressive Robot

Core Java Tutorial

Welcome to Core Java Tutorial. We have written a lot on Core Java and Java EE frameworks. There was no index post for Core Java tutorial and we used to get emails asking to make one so that any beginner can follow them and learn core java programming. Finally, we got time and here we […]

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Arch Linux — virtualbox — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — virtualbox — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202110-3 Related CVEs: CVE-2021-35545 CVE-2021-35542 CVE-2021-35540 CVE-2021-35538 CVE-2021-2475 CVE-2021-2454 CVE-2021-2443 CVE-2021-2442  +12 more Upstream summary: Type: multiple issues. Status: Fixed. Affected: 6.1.26-2. Fixed in: 6.1.28-1. Group: AVG-2476. Table of contents […]

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How to Scan for Vulnerabilities with OpenVAS on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Scan for Vulnerabilities with OpenVAS on FreeBSD 13

Introduction This guide explains how to Scan for Vulnerabilities with OpenVAS on FreeBSD 13 on FreeBSD 13. 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 […]

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Oracle Linux 8 — Graphics controller requirements for an installation on an Oracle VM VirtualBox guest — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Graphics controller requirements for an installation on an Oracle VM VirtualBox guest

🟠 High   ⏱ 5–30 min  Last verified: 18 November 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: Oracle Bug 30004543 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 […]

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Common Problems 119004

Ubuntu 14.04 LTS MySQL Service Crash Loop on Startup

🟡 Medium   ⏱ 5–30 min  Last verified: 18 November 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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AlmaLinux 8 — rhncfg — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — rhncfg — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2019:3355 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Common Problems 115534

logrotate Not Rotating Large Logs

🟡 Medium   ⏱ 5–30 min  Last verified: 18 November 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 Packer on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install Packer on FreeBSD 13

Introduction Deploying install packer on freebsd 13 on a FreeBSD 13 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

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FreeBSD 13 — isc-dhcp31-server — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — isc-dhcp31-server — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 18 November 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: isc-dhcp-server — server halt upon processing certain packets Related CVEs: CVE-2011-2748 CVE-2011-2749 Upstream summary: ISC reports: A pair of defects cause the server to halt upon processing certain packets. The […]

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