Networking

How to Configure Container Networking with CNI Plugins on Debian 11

• May 7, 2022
• Linux
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Introduction Deploying configure container networking with cni plugins 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. Prerequisites […]

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Ubuntu 14.04 LTS cannot resolve hostnames after reboot

• May 6, 2022
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 6 May 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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Ubuntu 22.04 LTS – systemd service fails at boot because of missing dependency unit – Fix & Prevention

• May 6, 2022
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 6 May 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 Configure Kernel Parameters with sysctl on CentOS Stream 9

• May 6, 2022
• CentOS
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Introduction This tutorial demonstrates how to Configure Kernel Parameters with sysctl on CentOS Stream 9 on CentOS Stream 9. 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 CentOS Stream 9 system with […]

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How to Install Cockpit Web Console on Debian 11

• May 6, 2022
• Linux
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Introduction This guide explains how to Install Cockpit Web Console 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 the […]

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How To Build A SIEM with Suricata and Elastic Stack on Debian 11

• May 6, 2022
• Linux
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The previous tutorials in this series guided you through installing, configuring, and running Suricata as an Intrusion Detection (IDS) and Intrusion Prevention (IPS) system. You also…

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How to Configure GitLab CI/CD on CentOS Stream 9

• May 5, 2022
• CentOS
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Introduction How to Configure GitLab CI/CD 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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How to Set Up Ansible on Debian 11

• May 5, 2022
• Linux
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Introduction This guide explains how to Set Up Ansible 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 the standard […]

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How to Set Up Database Backups with Percona XtraBackup on CentOS Stream 9

• May 4, 2022
• CentOS
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Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying set up database backups with percona xtrabackup on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Set Up Database Backups with Percona XtraBackup on CentOS Stream 9, including dnf module streams where applicable, systemd […]

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How to Set Up MariaDB Replication on Debian 9

• May 4, 2022
• Linux
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Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up set up mariadb replication 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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