DNS

How to Install MariaDB on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Install MariaDB on RHEL 7

How to Install MariaDB on RHEL 7 MariaDB is a community-developed, fully open-source relational database management system that serves as the default MySQL-compatible database engine on Red Hat Enterprise Linux 7. Maintained by the original developers of MySQL, MariaDB offers full SQL compliance, excellent performance, and a rich set of storage engines. Because RHEL 7 […]

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Common Problems 118389

Ubuntu 16.04 LTS – apt update fails with NO_PUBKEY for third-party repository – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 3 December 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 115095

RHEL 8 Postfix Mail Delivery Blocked by Firewall and SELinux

🟡 Medium   ⏱ 5–30 min  Last verified: 3 December 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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Common Problems 115045

RHEL 8 journalctl Storage Growth Consumes Root Disk

🟡 Medium   ⏱ 5–30 min  Last verified: 3 December 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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Common Problems 112993

Windows Server 2016 — Server (LanmanServer) service refuses connections — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 3 December 2020 Affected versions: Windows Server 2016 📖 ~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 Fail2ban on Oracle Linux 8 — step-by-step Oracle Linux 8 tutorial on Progressive Robot

How to Configure Fail2ban on Oracle Linux 8

Introduction This tutorial demonstrates how to Configure Fail2ban 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 the default AppStream […]

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Common Problems 117418

Ubuntu 20.04 LTS – apt update shows NO_PUBKEY for repository signatures

🟠 High   ⏱ 5–30 min  Last verified: 2 December 2020 Affected versions: Ubuntu 20.04 LTS Ubuntu 20.04 Ubuntu 20.04.6 📖 ~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 VLAN Tagging on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up VLAN Tagging on Debian 9

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up set up vlan tagging on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step carefully and […]

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Настройка BIND в качестве DNS-сервера частной сети на базе Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

Настройка BIND в качестве DNS-сервера частной сети на базе Ubuntu 18.04

Важным элементом управления конфигурацией и инфраструктурой сервера является поддержание удобного способа просмотра сетевых интерфейсов и IP-адресов по имени с помощью настройки корректной системы доменных имен (DNS). Использование полных доменных имен (FQDN), а не IP-адреса, для…

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How to Set Up a Load-Balanced PostgreSQL Cluster with Patroni on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up a Load-Balanced PostgreSQL Cluster with Patroni on RHEL 7

How to Set Up a Load-Balanced PostgreSQL Cluster with Patroni on RHEL 7 Running a single PostgreSQL instance is a liability in any production environment — it is a single point of failure that, when it goes down, takes your entire application with it. Patroni is an open-source, Python-based high-availability solution for PostgreSQL that uses […]

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