Operations

How to Configure MySQL Group Replication on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure MySQL Group Replication on RHEL 8

MySQL Group Replication extends traditional replication with built-in automatic failover and a distributed consensus protocol, making it suitable for high-availability deployments without requiring additional orchestration tools. In single-primary mode, one node accepts writes at a time while all nodes serve reads, and the group automatically elects a new primary if the current one fails. This […]

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Amazon Linux 2 — nettle — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — nettle — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2021-1629 Related CVEs: CVE-2021-20305 Upstream summary: A flaw was found in Nettle, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point […]

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Oracle Linux 8 — samba — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — samba — security and stability fixes — required update (ELSA-2022-7111)

🟡 Medium   ⏱ 10–30 min  Last verified: 8 February 2022 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-7111 Related CVEs: CVE-2022-32742 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Common Problems 121634

Debian 9 – ext4 filesystem remounts read-only after I/O errors

🔴 Critical   ⏱ 5–30 min  Last verified: 8 February 2022 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 Configure PostgreSQL Replication on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure PostgreSQL Replication on CentOS Stream 9

Introduction How to Configure PostgreSQL Replication on CentOS Stream 9 on CentOS Stream 9 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]

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AlmaLinux 8 — gegl04 — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — gegl04 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2022:0177 Related CVEs: CVE-2021-45463 Upstream summary: GEGL (Generic Graphics Library) is a graph-based image processing framework. Security Fix(es): * gegl: shell expansion via a crafted pathname (CVE-2021-45463) For more details about the […]

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Common Problems 117965

Ubuntu 18.04 LTS – hostname and FQDN mismatch causes sudo delay

🟡 Medium   ⏱ 5–30 min  Last verified: 8 February 2022 Affected versions: Ubuntu 18.04 LTS Ubuntu 18.04 Ubuntu 18.04.6 📖 ~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 […]

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How to Set Up Tekton CI/CD Pipelines on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up Tekton CI/CD Pipelines on Debian 11

Introduction How to Set Up Tekton CI/CD Pipelines on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 […]

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Gentoo Linux — net-im/telegram-desktop — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — net-im/telegram-desktop — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202105-07 Related CVEs: CVE-2021-27351 CVE-2020-17448 CVE-2020-25824 Upstream summary: It was discovered that Telegram failed to invalidate a recently active session. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]

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