Networking

Common Problems 120608

Debian 11 – time synchronization fails causing TLS and auth errors

🟠 High   ⏱ 5–30 min  Last verified: 10 May 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 Configure Mandatory Access Control on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure Mandatory Access Control on FreeBSD 12

Introduction How to Configure Mandatory Access Control on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]

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How to Configure the System Timezone on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure the System Timezone on Debian 11

Introduction Deploying configure the system timezone 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 You will […]

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Common Problems 116907

Ubuntu 22.04 Netplan Configuration Leaves Server Without Network

🟡 Medium   ⏱ 5–30 min  Last verified: 10 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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How to Configure ZFS on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure ZFS on CentOS Stream 9

Introduction How to Configure ZFS 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 reproducible […]

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How to Set Up Cron Jobs and Scheduled Tasks on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up Cron Jobs and Scheduled Tasks on Debian 11

Introduction Deploying set up cron jobs and scheduled tasks 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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How to Install WooCommerce on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install WooCommerce on CentOS Stream 9

Introduction How to Install WooCommerce 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 reproducible […]

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How to Install CockroachDB on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install CockroachDB on CentOS Stream 9

Introduction How to Install CockroachDB 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 reproducible […]

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Common Problems 117071

Ubuntu 22.04 LTS – OOM killer terminates critical services under load – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 7 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 Secure MySQL on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Secure MySQL on FreeBSD 12

Introduction Deploying secure mysql on freebsd 12 on a FreeBSD 12 machine differs from Linux in several important ways: packages come from the FreeBSD Ports Collection or the binary pkg repository, services are registered in /etc/rc.conf via sysrc(8), and firewall rules are written in pf.conf(5) syntax. This tutorial stays entirely within the standard base + […]

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