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Cloudflare's dashboard has roughly four hundred switches. About nine of them matter for a small site, and two of them are the reason your site is showing a redi

I put off trying Caddy for about two years, mostly out of habit. Nginx configs are muscle memory at this point, and Certbot does its job. Then I set up a side p

Let's Encrypt issues free, trusted TLS certificates and automates renewal. Certbot is the official client that configures your web server and installs a renewal

A well-written Dockerfile produces small, secure, fast-building images. A poorly written one produces multi-gigabyte images that rebuild from scratch on every c

A single Redis instance is a single point of failure. Sentinel provides automatic failover for a primary-replica setup, while Cluster shards data across multipl

GraphQL lets clients request exactly the data they need in a single round trip. Unlike REST, where endpoints are fixed, a GraphQL API exposes a typed schema, an

Elasticsearch is a distributed search and analytics engine built on Apache Lucene. It powers full-text search, log analysis, and real-time dashboards. This tuto

RabbitMQ is a mature message broker that implements the AMQP protocol. It routes messages between producers and consumers through exchanges and queues, and it e

OAuth 2.0 is the standard protocol for delegated authorization. It lets users grant an application limited access to their data on another service without shari

WebSockets provide full-duplex communication over a single TCP connection. Unlike HTTP request-response, the server can push data to the client at any time. Thi

Prometheus collects metrics by scraping HTTP endpoints, and Grafana turns that data into dashboards and alerts. Together they form the most common open-source m

The AWS CLI is the fastest way to work with S3. It handles bulk uploads, cross-region copies, lifecycle policies, and scripted backups. This tutorial covers ins

Apache Kafka is a distributed event streaming platform used for real-time data pipelines, log aggregation, and event-driven microservices. This tutorial explain

Kubernetes (K8s) is the de facto standard for orchestrating containers at scale. It handles scheduling, scaling, self-healing, and service discovery. This tutor

Ansible is an agentless configuration management tool. It connects to servers over SSH, runs tasks defined in YAML playbooks, and enforces the desired state of

tmux (terminal multiplexer) lets you run multiple terminal sessions inside one window, split the screen into panes, and keep long-running processes alive after

find is the most powerful file search tool on Linux. Unlike locate, which relies on a prebuilt index, find walks the filesystem in real time and can filter by n

Terraform lets you define cloud infrastructure in declarative configuration files, version them in Git, and apply changes consistently across environments. This

curl is the standard command-line tool for transferring data over HTTP, HTTPS, FTP, and dozens of other protocols. Developers use it to test APIs, inspect heade

Vim is installed on virtually every Linux and macOS system, which makes it the one editor you can always rely on. The learning curve is steep, but a small set o

systemd is the init system on nearly every modern Linux distribution. It starts services at boot, restarts them after failures, and captures their logs. This tu

SSH keys replace passwords with public-key cryptography. They are faster, immune to brute-force attacks, and required by most cloud providers. This tutorial cov

Git is the universal version control system for software projects. This cheat sheet groups the commands you will use most often by workflow stage, from initial

Nginx is the most widely deployed reverse proxy on the web. It sits in front of your application server, handles TLS termination, serves static files, and forwa

JSON Web Tokens (JWTs) are the standard way to authenticate users in stateless APIs. This tutorial explains the three-part JWT structure, walks through a login-