chris

Oracle Linux 8 — varnish:6 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — varnish:6 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2020-4756)

🟡 Medium   ⏱ 10–30 min  Last verified: 27 October 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4756 Related CVEs: CVE-2019-20637 CVE-2019-15892 CVE-2020-11653 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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Common Problems 121593

Debian 9: PostgreSQL fails because WAL partition is full

🔴 Critical   ⏱ 5–30 min  Last verified: 27 October 2020 Affected versions: Debian 9 📖 ~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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Common Problems 121474

Debian 9 – apt update shows NO_PUBKEY and rejects repository signatures

🟠 High   ⏱ 5–30 min  Last verified: 27 October 2020 Affected versions: Debian 9 📖 ~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 the ELK Stack on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Set Up the ELK Stack on Oracle Linux 8

Introduction This tutorial demonstrates how to Set Up the ELK Stack on Oracle Linux 8 on Oracle Linux 8. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered Oracle Linux 8 system with […]

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Common Problems 118503

Ubuntu 16.04 LTS – NTP drift causes clock skew and auth failures – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 October 2020 Affected versions: Ubuntu 16.04 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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Common Problems 117964

Ubuntu 18.04 root partition out of disk space

🟡 Medium   ⏱ 5–30 min  Last verified: 27 October 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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Ubuntu 16.04 — libmediainfo — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — libmediainfo — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 October 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5237-1 Related CVEs: CVE-2020-15395 CVE-2020-26797 CVE-2019-11372 CVE-2019-11373 Upstream summary: It was discovered that MediaInfoLib incorrectly handled certain specially crafted files. An attacker could possibly use this issue to cause a […]

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JUnit Setup Maven - JUnit 4 and JUnit 5 — step-by-step Programming tutorial on Progressive Robot

JUnit Setup Maven – JUnit 4 and JUnit 5

URL: https://www.progressiverobot.com/junit-setup-maven/ JUnit 4 and JUnit 5 are completely different frameworks. They both serve the same purpose, but the JUnit 5 is a completely different testing framework written from scratch. It's not using anything from JUnit 4 APIs. Here we will look into how to setup JUnit 4 and [JUnit 5](/community/tutorials/junit5-tutorial) in our maven projects. […]

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Java Socket Programming - Socket Server, Client example — step-by-step Programming tutorial on Progressive Robot

Java Socket Programming – Socket Server, Client example

URL: https://www.progressiverobot.com/java-socket-programming-server-client/ Welcome to Java Socket programming example. Every server is a program that runs on a specific system and listens on a specific port. Sockets are bound to the port numbers and when we run any server it just listens on the socket and waits for client requests. For example, tomcat server running on […]

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OpenBSD 7.6 — pffrag — errata 007_pffrag — reliability fix — syspatch and remediation — diagnosis and fix on OpenBSD 7.6

OpenBSD 7.6 — pffrag — errata 007_pffrag — reliability fix — syspatch and remediation

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: OpenBSD 7.6 📖 ~4 min read  •  Source: OpenBSD 7.6 errata 007_pffrag Errata topic: Reliability: pffrag (All architectures) Issued: February 10, 2025 Upstream summary: pf(4) could reassemble overlapping fragments into an incorrect IP packet that was too short. Table of contents Symptom […]

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