DNS

How to Configure Nginx as a TCP/UDP Load Balancer on Debian 11 (DEBIAN-11-2)

• July 22, 2022
• Linux
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Introduction Deploying configure nginx as a tcp/udp load balancer on debian 11 on a Debian 11 Bullseye machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. […]

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Debian 11 APT Lock Contention During Package Operations

• July 21, 2022
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 21 July 2022 Affected versions: Debian 11 📖 ~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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Ubuntu 22.04 LTS – NetworkManager and netplan renderer mismatch causes interface issues – Fix & Prevention

• July 21, 2022
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 21 July 2022 Affected versions: Ubuntu 22.04 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 Install Helm Package Manager for Kubernetes on Debian 11

• July 21, 2022
• Linux
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Introduction This guide explains how to Install Helm Package Manager for Kubernetes on Debian 11 on Debian 11 Bullseye. Debian Bullseye uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 11 install […]

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How to Install pip and Manage Python Packages on Debian 11

• July 20, 2022
• Linux
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Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up install pip and manage python packages on debian 11 on Bullseye leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Bullseye freeze. Follow each step […]

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Debian 11: NFS mounts hang during boot

• July 18, 2022
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 18 July 2022 Affected versions: Debian 11 📖 ~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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Ubuntu 22.04 LTS NTP Drift Causes Authentication and TLS Failures

• July 18, 2022
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 18 July 2022 📖 ~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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How to Set Up SSH Key Authentication on Debian 11

• July 18, 2022
• Linux
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Introduction This guide explains how to Set Up SSH Key Authentication on Debian 11 on Debian 11 Bullseye. Debian Bullseye uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 11 install with […]

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Debian 11 – SSH login denied after hardening changes

• July 17, 2022
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 17 July 2022 Affected versions: Debian 11 📖 ~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 Install and Configure Drone CI on RHEL 9

• July 17, 2022
• Linux
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Drone CI is an open-source, container-native continuous integration and delivery platform that runs every pipeline step inside an isolated Docker container. It integrates natively with GitHub, Gitea, GitLab, and Bitbucket, making it a lightweight alternative to Jenkins for teams already working with containers. Drone’s configuration lives in a .drone.yml file committed alongside your code, keeping […]

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