Backup Recovery

Common Problems 117038

Ubuntu 22.04 LTS – UFW blocks application traffic unexpectedly – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 25 September 2023 Affected versions: Ubuntu 22.04 LTS (Jammy) 📖 ~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 […]

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How to Use Skopeo for Container Images on Oracle Linux 9 — step-by-step Oracle Linux 9 tutorial on Progressive Robot

How to Use Skopeo for Container Images on Oracle Linux 9

Introduction Setting up use skopeo for container images on oracle linux 9 on a Oracle Linux 9 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Use Skopeo for Container Images on Oracle Linux 9, with all the commands you need, the SELinux and firewalld […]

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How to Set Up Consul Service Mesh on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Set Up Consul Service Mesh on Debian 12

Introduction This guide explains how to Set Up Consul Service Mesh on Debian 12 on Debian 12 Bookworm. Debian Bookworm 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 12 install with […]

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How to Install Kubernetes with kubeadm on Oracle Linux 9 — step-by-step Oracle Linux 9 tutorial on Progressive Robot

How to Install Kubernetes with kubeadm on Oracle Linux 9

Introduction This tutorial demonstrates how to Install Kubernetes with kubeadm on Oracle Linux 9 on Oracle Linux 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 Oracle Linux 9 system with the […]

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How to Configure SaltStack on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Configure SaltStack on Debian 12

Introduction Deploying configure saltstack on debian 12 on a Debian 12 Bookworm 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 Ensure Debian 12 Bookworm […]

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How to Set Timezone and NTP on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Timezone and NTP on CentOS Stream 9

Introduction This tutorial demonstrates how to Set Timezone and NTP 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 the […]

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Common Problems 120012

Debian 12 – kernel or grub updates fail because /boot is full

🟠 High   ⏱ 5–30 min  Last verified: 23 September 2023 Affected versions: Debian 12 📖 ~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 Set Up a Kubernetes Dashboard on Oracle Linux 9 — step-by-step Oracle Linux 9 tutorial on Progressive Robot

How to Set Up a Kubernetes Dashboard on Oracle Linux 9

Introduction This tutorial demonstrates how to Set Up a Kubernetes Dashboard on Oracle Linux 9 on Oracle Linux 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 Oracle Linux 9 system with […]

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Common Problems 116969

Ubuntu 22.04 LTS – UFW is enabled but expected rules are not applied

🟡 Medium   ⏱ 5–30 min  Last verified: 23 September 2023 Affected versions: Ubuntu 22.04 LTS Ubuntu 22.04 Ubuntu 22.04.4 📖 ~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 Install Rust with rustup on Debian 12 — step-by-step Debian 12 tutorial on Progressive Robot

How to Install Rust with rustup on Debian 12

Introduction How to Install Rust with rustup on Debian 12 is a fundamental operation for any administrator maintaining a Debian 12 Bookworm server. Debian 12 Bookworm ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 12. […]

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