Linux

How to Install Keepalived for High Availability on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Keepalived for High Availability on Debian 10

Introduction How to Install Keepalived for High Availability on Debian 10 is a fundamental operation for any administrator maintaining a Debian 10 Buster server. Debian 10 Buster 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 […]

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How to Configure DKIM, SPF and DMARC on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure DKIM, SPF and DMARC on RHEL 8

Email authentication standards — SPF, DKIM, and DMARC — are the primary tools used by receiving mail servers to verify that messages claiming to come from your domain actually originate from your authorized infrastructure. Without them, your outbound mail is far more likely to land in spam folders or be rejected outright. On RHEL 8, […]

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Common Problems 121182

Debian 10 – kernel panic after update due to incompatible third-party module

🔴 Critical   ⏱ 5–30 min  Last verified: 14 August 2020 Affected versions: Debian 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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Ubuntu 18.04 — snapcraft — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — snapcraft — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 14 August 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4661-1 Related CVEs: CVE-2020-27348 https://launchpad.net/bugs/1901572 Upstream summary: It was discovered that Snapcraft includes the current directory when configuring LD_LIBRARY_PATH for application commands. If a user were tricked into installing a […]

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How to Install Graylog Log Management on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Install Graylog Log Management on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up install graylog log management on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully and […]

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Cómo instalar Apache Tomcat 9 en Ubuntu 18.04 — step-by-step Linux tutorial on Progressive Robot

Cómo instalar Apache Tomcat 9 en Ubuntu 18.04

Apache Tomcat es un servidor web y contenedor de servlets que se utiliza para presentar aplicaciones Java. Tomcat es una implementación de código abierto de las tecnologías Java Servlet y JavaServer Pages publicada por la Apache Software Foundation. En este tutorial se abordan…

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Ubuntu 20.04 — sane-backends — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — sane-backends — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 14 August 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4470-1 Related CVEs: CVE-2017-6318 CVE-2020-12861 CVE-2020-12862 CVE-2020-12863 CVE-2020-12864 CVE-2020-12865 CVE-2020-12866 CVE-2020-12867 Upstream summary: Kritphong Mongkhonvanit discovered that sane-backends incorrectly handled certain packets. A remote attacker could possibly use this issue […]

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