Linux

How to Back Up and Restore MySQL Databases with mysqldump on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Back Up and Restore MySQL Databases with mysqldump on RHEL 9

Regular database backups are non-negotiable for any production system. mysqldump is the standard MySQL/MariaDB logical backup tool — it exports database contents as SQL statements (CREATE TABLE, INSERT) that can be restored on any compatible server. While mysqldump is not the fastest solution for very large databases (where Percona XtraBackup or MySQL Enterprise Backup are […]

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Debian 11 — commons-beanutils — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — commons-beanutils — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2014-0114 CVE-2019-10086 CVE-2025-48734 Upstream summary: Apache Commons BeanUtils, as distributed in lib/commons-beanutils-1.8.0.jar in Apache Struts 1.x through 1.3.10 and in other products requiring commons-beanutils through 1.9.2, does not […]

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Common Problems 116475

Ubuntu 24.04 LTS – snap refresh fails repeatedly – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Ubuntu 24.04 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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How to Configure MySQL Group Replication on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure MySQL Group Replication on RHEL 9

MySQL Group Replication extends traditional primary-replica replication with a built-in, distributed consensus protocol (Paxos-based) that provides automatic failover, multi-primary writes, and conflict detection. Unlike standard replication where a manual intervention is needed to promote a replica to primary, Group Replication automatically elects a new primary if the current primary fails — making it the foundation […]

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Debian 13 — rust-hyper — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — rust-hyper — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-35863 CVE-2021-21299 CVE-2021-32714 CVE-2021-32715 CVE-2022-31394 Upstream summary: An issue was discovered in the hyper crate before 0.12.34 for Rust. HTTP request smuggling can occur. Remote code execution can […]

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How to Configure MySQL Primary-Replica Replication on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure MySQL Primary-Replica Replication on RHEL 9

MySQL primary-replica replication (formerly called master-slave) copies data changes from a primary (write) server to one or more replica (read) servers in near-real-time. Replication solves multiple operational problems: distributing read traffic across replicas reduces load on the primary, a replica provides a hot standby for failover if the primary fails, replicas can be used for […]

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Common Problems 114996

RHEL 8 LVM Thin Pool Full Triggers Read-Only Application Errors

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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Debian 13 — activemq — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — activemq — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2011-4905 CVE-2014-3576 CVE-2014-3600 CVE-2014-3612 CVE-2015-5254 CVE-2015-6524 CVE-2015-7559 CVE-2016-0782  +12 more Upstream summary: Apache ActiveMQ before 5.6.0 allows remote attackers to cause a denial of service (file-descriptor exhaustion and […]

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How to Install phpMyAdmin on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install phpMyAdmin on RHEL 9

phpMyAdmin is a web-based graphical administration interface for MySQL and MariaDB databases. It allows developers and DBAs to manage databases, tables, rows, users, and permissions through a browser without needing to use the command-line MySQL client. phpMyAdmin is especially useful for non-technical users who need to browse data, run queries, import/export CSV or SQL files, […]

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Debian 11 — iniparser — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — iniparser — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2023-33461 CVE-2025-0633 Upstream summary: iniparser v4.1 is vulnerable to NULL Pointer Dereference in function iniparser_getlongint which misses check NULL for function iniparser_getstring's return. Table of contents Symptom & […]

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