Containers

Common Problems 116531

UFW Blocking Kubernetes Traffic on Ubuntu 24.04 LTS

🟠 High   ⏱ 5–30 min  Last verified: 4 October 2025 Affected versions: 24.04 📖 ~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 […]

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How to Manage Docker Images and Containers on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Deploy Applications with Docker Compose on Ubuntu 24.04

Docker Compose simplifies deploying multi-service applications. This guide walks through creating a production-ready Docker Compose deployment for a LEMP stack (Nginx, MySQL, PHP) on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server Docker Engine and Docker Compose plugin installed A user in the docker group Step 1 – […]

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How to Set Up an OpenVPN Server on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Set Up an OpenVPN Server on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up set up an openvpn server on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting […]

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How to Install Apache Tomcat 10 on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Install Apache Tomcat 10 on Debian 13

Introduction Deploying install apache tomcat 10 on a Debian 13 Trixie 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 need a registered […]

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How to Configure the Firewall on RHEL 9 with firewalld — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure the Firewall on RHEL 9 with firewalld

Red Hat Enterprise Linux 9 uses firewalld as its default firewall management daemon, backed by nftables as the kernel netfilter framework (replacing iptables which was the default in RHEL 7 and earlier). firewalld provides a zone-based model where each network interface is assigned to a trust zone — public, internal, dmz, trusted, and more — […]

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Common Problems 124026

Oracle Linux 10 – Podman container cannot bind privileged port due to SELinux context

🟠 High   ⏱ 5–30 min  Last verified: 2 October 2025 Affected versions: Oracle Linux 10 📖 ~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 Mount NFS Shares on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Mount NFS Shares on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up mount nfs shares on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting configuration will […]

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How to Configure SSH with FIDO2 Hardware Keys on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure SSH with FIDO2 Hardware Keys on Debian 13

Introduction Deploying configure ssh with fido2 hardware keys on a Debian 13 Trixie 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 Before you begin, […]

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How to Install Docker CE on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Docker CE on RHEL 10

Introduction How to Install Docker CE on RHEL 10 on RHEL 10 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 and […]

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Common Problems 124040

Oracle Linux 10 – Podman image pull TLS handshake timeout on registry access – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 1 October 2025 Affected versions: Oracle Linux 10 📖 ~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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