Troubleshooting

How to Configure Logstash on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Logstash on Debian 9

Introduction Deploying configure logstash on debian 9 on a Debian 9 Stretch 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 Ensure Debian 9 Stretch […]

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Debian 9 — zeromq3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — zeromq3 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 January 2020 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-13132 CVE-2019-6250 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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Arch Linux — cgit — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — cgit — vulnerability — 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-201808-2 Related CVEs: CVE-2018-14912 Upstream summary: Type: directory traversal. Status: Fixed. Affected: 1.2-1. Fixed in: 1.2.1-1. Group: AVG-745. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]

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How to Configure Huge Pages for Database Performance on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Huge Pages for Database Performance on RHEL 7

How to Configure Huge Pages for Database Performance on RHEL 7 Database engines — particularly Oracle, PostgreSQL, and MySQL/InnoDB — allocate and manage large memory pools for their buffer caches and shared memory segments. By default, the Linux kernel manages memory in 4 KB pages, which means that a 32 GB database buffer pool requires […]

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Common Problems 115090

Custom unit changes ignored because daemon-reload not run

🟡 Medium   ⏱ 5–30 min  Last verified: 8 January 2020 📖 ~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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Common Problems 114932

RHEL 8 SELinux Denies Apache Access to Custom Content Directory

🟠 High   ⏱ 5–30 min  Last verified: 8 January 2020 Affected versions: 8.6 8.7 8.8 8.9 8.10 📖 ~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 […]

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How to Deploy a Zend Framework Application on SLES 15 — step-by-step SUSE Linux Enterprise 15 tutorial on Progressive Robot

How to Deploy a Zend Framework Application on SLES 15

Introduction This tutorial covers How to Deploy a Zend Framework Application on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: […]

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FreeBSD 12 — paraview — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — paraview — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 January 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: tiff — buffer overflow vulnerability Related CVEs: CVE-2004-0803 CVE-2004-0804 CVE-2004-0886 CVE-2004-1308 CVE-2005-1544 Upstream summary: A Gentoo Linux Security Advisory reports: Tavis Ormandy of the Gentoo Linux Security Audit Team discovered […]

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

How to Set Up Yubikey Authentication on Debian 9

Introduction How to Set Up Yubikey Authentication 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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