How to Configure SSL/TLS with OpenSSL and Self-Signed Certificates on RHEL 9

November 10, 2025
Linux
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Even when free trusted certificates from Let’s Encrypt are available for public domains, self-signed certificates serve important roles: development environments, internal network services, IoT devices, automated testing pipelines, and machine-to-machine communication within a private network. Unlike Let’s Encrypt certificates, self-signed certificates require no domain ownership verification or outbound internet access — they can be generated […]

RHEL 10 tuned Profile Change Causes Latency Spikes

November 10, 2025
Linux
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🟡 Medium ⏱ 5–30 min Last verified: 10 November 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]

How to Set Up Varnish Cache as a Reverse Proxy on RHEL 9

November 9, 2025
Linux
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Varnish Cache is a high-performance HTTP reverse proxy designed specifically for caching. Unlike Nginx FastCGI cache which caches PHP output files on disk, Varnish stores cached objects entirely in RAM and can serve tens of thousands of requests per second from memory. Varnish operates in front of your web server: it listens on port 80 […]

How to Configure Nginx FastCGI Caching on RHEL 9

November 9, 2025
Linux
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Nginx FastCGI caching stores the output of PHP-FPM (or any FastCGI backend) responses as files on disk and serves them directly without hitting PHP for subsequent requests. For a WordPress site or PHP application serving the same page to many users, this can reduce PHP execution from 200ms to under 1ms and cut server load […]

How to Manage Services with systemd on Debian 13

November 9, 2025
Linux
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Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up manage services with systemd on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting configuration […]

How to Install K3s on RHEL 10

November 8, 2025
Linux
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Introduction How to Install K3s on RHEL 10 on RHEL 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 is reproducible and production-safe. […]

How to Install Jenkins on SLES 16

November 8, 2025
SUSE Linux Enterprise
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Introduction This tutorial covers How to Install Jenkins on SLES 16 on SLES 16. SLES 16 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Step 1 — Add Jenkins Repository zypper addrepo -f https://pkg.jenkins.io/opensuse-stable/ jenkins zypper –gpg-auto-import-keys […]

How to Install and Configure Caddy Web Server on RHEL 9

November 8, 2025
Linux
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Caddy is a modern, open-source web server written in Go that stands out for one defining feature: automatic HTTPS. Caddy obtains and renews TLS certificates from Let’s Encrypt or ZeroSSL automatically, with zero configuration required beyond specifying a domain name. It also supports HTTP/2 and HTTP/3 (QUIC) out of the box, and its declarative Caddyfile […]

Debian 13 Journal Logs Grow Unbounded and Consume Disk

November 8, 2025
Linux
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🟡 Medium ⏱ 5–30 min Last verified: 8 November 2025 📖 ~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 […]

How to Set Up HTTP/3 with Nginx on Debian 13

November 7, 2025
Linux
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Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up set up http/3 with nginx on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting […]

Storage Disk

How to Configure SSL/TLS with OpenSSL and Self-Signed Certificates on RHEL 9

RHEL 10 tuned Profile Change Causes Latency Spikes

How to Set Up Varnish Cache as a Reverse Proxy on RHEL 9

How to Configure Nginx FastCGI Caching on RHEL 9

How to Manage Services with systemd on Debian 13

How to Install K3s on RHEL 10

How to Install Jenkins on SLES 16

How to Install and Configure Caddy Web Server on RHEL 9

Debian 13 Journal Logs Grow Unbounded and Consume Disk

How to Set Up HTTP/3 with Nginx on Debian 13

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