Systems Administration - SudoSecurity

The SSO Tax: Why Self-Hosted Projects Are Gating Login Behind a Paywall

A growing list of open-core self-hosted projects, from Grafana to Planka, gate single sign-on behind an Enterprise tier. Here's which protocol actually gets paywalled, and what to check before you deploy.

Self Hosting

Oracle Free Tier ARM Cutoff: What to Do Before Aug 18

Oracle halved its Always Free ARM allocation to 2 OCPU/12GB, enforced Aug 18, 2026. Here's the exact numbers, what's still ambiguous, and how to resize in time.

Self Hosting

What You Can Self-Host on Oracle Cloud Free Tier (2026)

What actually fits on Oracle Cloud free tier after the June 2026 cut: Ghost, Vaultwarden, Syncthing, monitoring, and a small AI model, sized in real RAM.

Artificial intelligence

The Complete Self-Hosted AI Stack for 2026

Building a local AI server is more than installing Ollama. This guide builds a full production AI stack with Open WebUI, LiteLLM, Qdrant, Traefik, and Langfuse — what each component does, why it's needed, and three complete Docker Compose configurations for beginners, power users, and small teams.

Self Hosting Featured

Self-Host OpenClaw: VPS Setup to Production (2026)

Self-host OpenClaw from zero to production. Server provisioning, SSH lockdown, Docker, reverse proxy, Fail2ban, performance tuning, and full backup strategy in one guide.

Self Hosting

Self-Hosting Prometheus and Grafana: Infrastructure Monitoring That Actually Works

Build a production-grade monitoring stack with Prometheus and Grafana from scratch. Covers architecture, Docker Compose deployment, Node Exporter, alerting with Alertmanager, PromQL from basics to advanced, pre-built dashboards, and everything CoderOasis uses to monitor its own infrastructure.

Self Hosting

Zero Trust Everything: The Complete Guide to Self-Hosting Teleport for Secure Infrastructure Access

CoderOasis runs Teleport internally for everything — admin panel access, secure database connections, Kubernetes, and zero-trust philosophy across our entire team. This is the complete technical guide to installing, configuring, and running your own self-hosted Teleport cluster from scratch.

Self Hosting

How to Self-Host Your Own Email Server With Mailcow in 2026 — Complete Setup Guide

How to Self-Host Your Own Email Server With Mailcow in 2026 — Complete Setup Guide Meta Description: Stop letting Google and Microsoft read your email. This guide sets up a complete private email server with Mailcow on a NetCup VPS — DNS, SPF, DKIM, DMARC, TLS, webmail, and mobile clients.

Self Hosting Featured

The Complete Self-Hosted Productivity Stack: Nextcloud, Vaultwarden, Immich, Jellyfin, and Paperless in 2026

Replace Google Drive, Google Photos, 1Password, Plex, and your document scanner with a self-hosted stack that runs on your hardware. Complete Docker Compose setup with Traefik, Nextcloud, Vaultwarden, Immich, Jellyfin, and Paperless-ngx.

Minecraft

Bukkit, Spigot, Paper, Folia: What You're Actually Running

There is a fifteen-year fork tree underneath every Minecraft server, and most admins copy a jar without knowing what's in it. Here's the whole chain, with the code — including the config key most DAB guides get wrong.

Systems Administration

How to Debug Minecraft Server Lag with Spark Profiler (2026 Guide)

Your server dropped to 12 TPS. You copied Aikar's flags. You upgraded Java. Nothing changed. That's because JVM flags don't fix plugin bugs. Here's how to find what's actually killing your tick budget.

Minecraft

Your Minecraft Server Wants Java 25, Not Java 26

Every six months the same thread appears and nobody maps the JVM engineering onto what a Minecraft server actually does. This does — version by version, with the flag most guides still tell you to set that will eventually stop your server from booting.

Hardware

The RAMpocalypse! How AI Companies Are Destroying the Hosting Industry and Your Wallet

How AI infrastructure demand is driving up VPS and dedicated server costs — and why your hosting bill is going up even though you haven't changed anything.

Systems Administration

What is a Web Server? Apache, Nginx, and How the Internet Delivers Web Pages

A web server accepts HTTP requests and returns responses. Apache has been doing this since 1995. Nginx rebuilt the model in 2004 and took over the cloud. Here's how they work, how they differ, and how to pick between them.

Cybersecurity

What is Cybersecurity? The Field That Keeps the Internet From Collapsing

Cybersecurity is the discipline of protecting systems, networks, and data from attack, damage, and unauthorized access. Here's what it actually covers, how attacks work, how defense works, and why every developer needs to understand it.

Self Hosting

Why I Switched from WordPress to Ghost for CoderOasis

I exclusively used WordPress somewhere between 2008 to 2019 – if not earlier than that for me. At least eleven years. That's a good long time to dedicate to a platform. And honestly? For most of that time, I thought WordPress was fine. I was managing my blog, publishing

Systems Administration

Simple Guide to Setting Up an NGINX Reserve Proxy

I will first highly recommend to read Installing the NGINX Web Server on Debian & Ubuntu and Installing LetsEncrypt's CertBot Package on Debian & Ubuntu articles if you do not already have NGINX and using LetsEncrypt installed and configured. Creating the Configuration File First, we are going to

Systems Administration

Important NGINX Directories and Files for Referencing

When it comes to running a web server for all of my online projects, NGINX is the first that comes to mind for me. By default, it follows my guidelines of running a piece of software – meaning that the software is security-minded, performance-driven, and honestly, really easy to

Systems Administration

Installing LetsEncrypt's CertBot on Ubuntu 20.04+

LetsEncrypt is one of many Certificate Authorities (CAs) that provide genuine SSL/TLS Certificates to people who want to secure the connection to their website. This allows people to access a website via encrypted HTTPS traffic. The process to make a certificate with LetsEncrypt's CertBot is pretty simple

Systems Administration

Installing the NGINX Web Server on Debian & Ubuntu

When it comes to running a web server for all of my online projects, NGINX is the first that comes to mind for me. By default, it follows my guidelines of running a piece of software – meaning that the software is security-minded, performance-driven, and honestly, really easy to

The machine is fine. It’s the config.

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Linux

Oracle Free Tier ARM Cutoff: What to Do Before Aug 18

Containers & VMs

Oracle Free Tier ARM Cutoff: What to Do Before Aug 18

Networking & servers

Zero-Trust Access for Homelabbers: Teleport vs. Tailscale vs. WireGuard vs. Cloudflare Tunnel

Every article

The SSO Tax: Why Self-Hosted Projects Are Gating Login Behind a Paywall

What You Can Self-Host on Oracle Cloud Free Tier (2026)

The Complete Self-Hosted AI Stack for 2026

Self-Host OpenClaw: VPS Setup to Production (2026)

Bukkit, Spigot, Paper, Folia: What You're Actually Running

How to Debug Minecraft Server Lag with Spark Profiler (2026 Guide)

Your Minecraft Server Wants Java 25, Not Java 26

Why I Switched from WordPress to Ghost for CoderOasis

Simple Guide to Setting Up an NGINX Reserve Proxy

Important NGINX Directories and Files for Referencing

Installing LetsEncrypt's CertBot on Ubuntu 20.04+

Installing the NGINX Web Server on Debian & Ubuntu