🟢 Low ⏱ 5–30 min Last verified: 1 January 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Selected tuned profile is shown but kernel parameters remain unchanged. Symptoms tuned-adm […]
nftables is the modern successor to iptables and is the default firewall framework in RHEL 9. It replaces iptables, ip6tables, arptables, and ebtables with a single unified tool, offering better performance through an improved kernel path, atomic rule replacement, and a cleaner, more readable configuration syntax. This tutorial covers everything you need to know to […]
🟠 High ⏱ 5–30 min Last verified: 27 December 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Domain users cannot log in during directory service outages. Symptoms pam_sss errors […]
🟠 High ⏱ 5–30 min Last verified: 6 December 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]
Introduction Setting up tune system performance with tuned on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Tune System Performance with tuned on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and […]
Percona XtraBackup is the industry-standard open-source tool for online, non-blocking hot backups of MySQL and MariaDB InnoDB databases. Unlike mysqldump, which produces a logical SQL dump and requires more time for large databases, XtraBackup performs a physical backup — copying InnoDB data files directly while MySQL is running, without acquiring table locks that would block […]
🔴 Critical ⏱ 5–30 min Last verified: 14 November 2025 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 & […]
SQLite is a self-contained, serverless, zero-configuration SQL database engine that stores an entire database in a single file on disk. Unlike MySQL, PostgreSQL, and MongoDB which require a running server process, SQLite is a library that is linked directly into the application — there is no network connection, no authentication, and no administration overhead. SQLite […]
PostgreSQL Streaming Replication sends WAL (Write-Ahead Log) records from a primary server to one or more standby servers in near-real-time, keeping standbys continuously synchronised with the primary. This provides high availability (automatic or manual failover when the primary fails), read scaling (queries can be distributed to hot standbys), and geographic redundancy. Unlike logical replication which […]
🟠 High ⏱ 5–30 min Last verified: 12 November 2025 Affected versions: CentOS Stream 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 […]
