How to Configure Nginx Logging Ubuntu: Setup, Rotation, and Best Practices

February 3, 2026
Tutorials
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Configuring logging in Nginx on Ubuntu is essential for monitoring server performance, troubleshooting errors, and ensuring security. Whether you’re dealing with high-traffic websites or simple applications, knowing how to configure Nginx logging Ubuntu setups allows you to capture critical data without overwhelming your system. This comprehensive tutorial walks you through setting up access and error logs, implementing log rotation to manage disk space, and applying advanced configurations for optimal observability.

How to Install Netdata on RHEL 10

February 2, 2026
Linux
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Introduction Setting up install netdata on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install Netdata on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and how to validate the result on […]

How to Configure Docker Daemon TLS on Oracle Linux 10

February 2, 2026
Oracle Linux
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Introduction How to Configure Docker Daemon TLS on Oracle Linux 10 on Oracle Linux 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 […]

How to Configure auditd for Security Event Logging on RHEL 9

February 2, 2026
Linux
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The Linux Audit Framework, managed by the auditd daemon, records security-relevant kernel events to a structured log for compliance auditing, incident investigation, and intrusion detection. On RHEL 9, auditd is installed and enabled by default, giving you an immediate foundation for building a comprehensive security event trail. This tutorial covers configuring the audit daemon log […]

Postfix relay denied by SELinux policy

February 1, 2026
Tutorials
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🟠 High ⏱ 5–30 min Last verified: 1 February 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Mail relay attempts fail due to SELinux denials in postfix context. Symptoms […]

Ubuntu 24.04 — pam-u2f — vulnerability — patch and remediation guide

February 1, 2026
Linux
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🟢 Low ⏱ 5–15 min Last verified: 1 February 2026 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read • Source: Ubuntu Security Notice USN-7806-1 Related CVEs: CVE-2025-23013 Upstream summary: It was discovered that PAM/U2F could allow for authentication bypass in some configurations. An attacker could possibly use this issue to execute arbitrary code […]

SLES 16 — sssd — multiple vulnerabilities (12 CVEs) — patch and remediation guide

February 1, 2026
Linux
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🟠 High ⏱ 15–60 min Last verified: 1 February 2026 Affected versions: SLES 16 📖 ~4 min read • Source: SUSE advisory RHSA-2025:19610 (see also SUSE bugzilla) Related CVEs: CVE-2025-11561 CVE-2010-4341 CVE-2011-1758 CVE-2013-0219 CVE-2013-0220 CVE-2013-0287 CVE-2018-10852 CVE-2018-16838 +4 more Upstream summary: A flaw was found in the integration of Active Directory and the System […]

How to Install Deno on RHEL 10

January 31, 2026
Linux
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Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying install deno both straightforward and auditable. This tutorial covers the complete procedure for how to Install Deno on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. Prerequisites The procedure assumes you are […]

SSH Key Authentication Fails With Correct Keys

January 28, 2026
Tutorials
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🟡 Medium ⏱ 5–30 min Last verified: 28 January 2026 📖 ~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 […]

RHEL 10 Rsyslog Stops Forwarding Logs to Central SIEM

January 28, 2026
Linux
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🟠 High ⏱ 5–30 min Last verified: 28 January 2026 Affected versions: RHEL 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 Configure Nginx Logging Ubuntu: Setup, Rotation, and Best Practices

How to Install Netdata on RHEL 10

How to Configure Docker Daemon TLS on Oracle Linux 10

How to Configure auditd for Security Event Logging on RHEL 9

Postfix relay denied by SELinux policy

Ubuntu 24.04 — pam-u2f — vulnerability — patch and remediation guide

SLES 16 — sssd — multiple vulnerabilities (12 CVEs) — patch and remediation guide

How to Install Deno on RHEL 10

SSH Key Authentication Fails With Correct Keys

RHEL 10 Rsyslog Stops Forwarding Logs to Central SIEM

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