Linux

How to Install and Configure Ansible on Ubuntu 16.04 — step-by-step Linux tutorial on Progressive Robot

How to Install and Configure Ansible on Ubuntu 16.04

Configuration management systems are designed to make controlling large numbers of servers easy for administrators and operations teams. They allow you to control many different systems in an automated way from one central location. Ansible is a simple configuration management system.

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Common Problems 119126

Ubuntu 14.04 LTS – Postfix mail queue backlog grows uncontrollably – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 6 January 2020 Affected versions: Ubuntu 14.04 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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Common Problems 115135

RHEL 8 Cockpit Web Console Unreachable on Port 9090 – RHEL 8 Post 124

🟡 Medium   ⏱ 5–30 min  Last verified: 6 January 2020 📖 ~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 114968

RHEL 8 Podman Containers Cannot Resolve DNS Names

🟡 Medium   ⏱ 5–30 min  Last verified: 6 January 2020 📖 ~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 Set Up Unbound DNS Resolver on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Set Up Unbound DNS Resolver on Debian 9

Introduction This guide explains how to Set Up Unbound DNS Resolver on Debian 9 on Debian 9 Stretch. Debian Stretch 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 9 install with […]

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Gentoo Linux — media-libs/faad2 — multiple vulnerabilities (19 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — media-libs/faad2 — multiple vulnerabilities (19 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202006-17 Related CVEs: CVE-2018-19502 CVE-2018-19503 CVE-2018-19504 CVE-2018-20194 CVE-2018-20195 CVE-2018-20196 CVE-2018-20197 CVE-2018-20198  +11 more Upstream summary: Multiple vulnerabilities have been discovered in FAAD2. Please review the CVE identifiers referenced below for details. Table […]

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Oracle Linux 8 — sudo — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — sudo — vulnerability — patch and remediation guide (ELSA-2020-0487)

🟠 High   ⏱ 15–60 min  Last verified: 6 January 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-0487 Related CVEs: CVE-2019-18634 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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openSUSE Tumbleweed — supervisor — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — supervisor — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2019-12105 Upstream summary: In Supervisor through 4.0.2, an unauthenticated user can read log files or restart a service. Note: The maintainer responded that the affected […]

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How to Install and Configure Samba File Server on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install and Configure Samba File Server on Debian 9

Introduction This guide explains how to Install and Configure Samba File Server on Debian 9 on Debian 9 Stretch. Debian Stretch 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 9 install […]

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SLES 15 — system-user-root — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — system-user-root — vulnerability — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 6 January 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2019:697-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-5021 Upstream summary: Versions of the Official Alpine Linux Docker images (since v3.3) contain a NULL password for the `root` user. This vulnerability appears to […]

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