DNS

How to Set Up Kea DHCP Server on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Set Up Kea DHCP Server on Debian 11

Introduction Debian 11 Bullseye is built around the ethos of stability and free software. Setting up set up kea dhcp server 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 carefully […]

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How to Configure IPv6 Networking on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure IPv6 Networking on RHEL 9

IPv6 is the successor to IPv4, offering a vastly larger address space and improved routing efficiency, and is increasingly required for modern infrastructure and public internet connectivity. On RHEL 9, NetworkManager is the primary tool for managing network configuration, and it fully supports both static IPv6 addressing and automatic assignment via SLAAC and DHCPv6. This […]

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How to Configure Networking with /etc/network/interfaces on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Configure Networking with /etc/network/interfaces on Debian 11

Introduction How to Configure Networking with /etc/network/interfaces on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 11. […]

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Common Problems 116937

Ubuntu 22.04 GRUB Rescue Prompt After Kernel Update

🟡 Medium   ⏱ 5–30 min  Last verified: 22 September 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 /etc/hosts, /etc/resolv.conf and DNS Resolution on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure /etc/hosts, /etc/resolv.conf and DNS Resolution on RHEL 7

How to Configure /etc/hosts, /etc/resolv.conf and DNS Resolution on RHEL 7 DNS resolution is one of the first things you troubleshoot when a server cannot reach other hosts by name. On Red Hat Enterprise Linux 7, name resolution is controlled by a layered system involving /etc/hosts, /etc/resolv.conf, /etc/nsswitch.conf, and NetworkManager. Understanding how these files interact […]

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How to Mount NFS Shares at Boot on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Mount NFS Shares at Boot on Debian 11

Introduction Deploying mount nfs shares at boot 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 Before […]

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Oracle Linux 8 — bind9.16 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — bind9.16 — vulnerability — patch and remediation guide (ELSA-2022-6781)

🟠 High   ⏱ 15–60 min  Last verified: 21 September 2022 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-6781 Related CVEs: CVE-2022-38177 CVE-2022-38178 CVE-2022-3080 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification […]

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Common Problems 117017

Ubuntu 22.04 Docker Daemon Fails with cgroup v2 Configuration Errors

🟡 Medium   ⏱ 5–30 min  Last verified: 21 September 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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Common Problems 117942

Could Not Get Lock /var/lib/dpkg/lock-frontend

🟡 Medium   ⏱ 5–30 min  Last verified: 20 September 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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Common Problems 117019

Ubuntu 22.04 LTS – snap install fails with cannot communicate with server

🟡 Medium   ⏱ 5–30 min  Last verified: 20 September 2022 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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