DNS

Common Problems 113897

RHEL 10 – DNF metadata download fails behind proxy with Curl error 28 – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 April 2026 Affected versions: RHEL 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 Related Errors & […]

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Common Problems 113988

RHEL 10 NFS Mount Hangs During Startup

🟠 High   ⏱ 5–30 min  Last verified: 19 April 2026 Affected versions: RHEL 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 Related Errors & […]

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Alpine Linux edge — dnsdist — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — dnsdist — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 2.0.4-r0 📖 ~4 min read  •  Source: Alpine secdb entry — dnsdist 2.0.4-r0 Related CVEs: CVE-2026-0396 CVE-2026-0397 CVE-2026-24028 CVE-2026-24029 CVE-2026-24030 CVE-2026-27853 CVE-2026-27854 CVE-2026-33254  +12 more Upstream summary: Alpine community repository for vedge ships dnsdist 2.0.4-r0 which […]

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How to Configure DRBD for High-Availability Storage on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure DRBD for High-Availability Storage on RHEL 9

DRBD (Distributed Replicated Block Device) is a kernel-level storage replication solution that mirrors a block device between two servers in real time, functioning as a network-based RAID 1. It is widely used as the shared-storage layer in high-availability clusters managed by Pacemaker and Corosync on RHEL 9. Unlike shared-disk solutions, DRBD requires no SAN or […]

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How to Install Kustomize on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Kustomize on RHEL 10

Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying install kustomize both straightforward and auditable. This tutorial covers the complete procedure for how to Install Kustomize on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. Prerequisites The procedure assumes you are […]

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Red Hat Enterprise Linux 9 — dnsmasq — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Red Hat Enterprise Linux 9

Red Hat Enterprise Linux 9 — dnsmasq — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read  •  Source: Red Hat advisory RHSA RHSA-2026:19373 Related CVEs: CVE-2026-2291 CVE-2026-4890 CVE-2026-4891 CVE-2026-4892 CVE-2026-4893 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary […]

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How to Install PostgreSQL 17 on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install PostgreSQL 17 on RHEL 10

Introduction Setting up install postgresql 17 on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install PostgreSQL 17 on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and how to validate the […]

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Ubuntu 16.04 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — dnsmasq — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 17 April 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8268-1 Related CVEs: CVE-2026-4890 CVE-2026-4891 CVE-2026-2291 CVE-2026-4892 CVE-2026-5172 CVE-2026-4893 CVE-2023-28450 CVE-2023-50387  +12 more Upstream summary: Andrew S. Fasano, Royce M, and Hugo Martinez Ray discovered that Dnsmasq did not allocate […]

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Common Problems 114108

RHEL 10 Kdump Fails to Capture Crash Dump After Kernel Panic

🔴 Critical   ⏱ 5–30 min  Last verified: 15 April 2026 Affected versions: RHEL 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 Related Errors & […]

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Red Hat Enterprise Linux 9 — bind9.18 — vulnerability — patch and remediation guide — diagnosis and fix on Red Hat Enterprise Linux 9

Red Hat Enterprise Linux 9 — bind9.18 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Red Hat Enterprise Linux 9 📖 ~4 min read  •  Source: Red Hat advisory RHSA RHSA-2026:7915 Related CVEs: CVE-2026-1519 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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