Real-World DevOps Guides

Nginx Headers Explained: The Most Important Ones HTTP headers are metadata exchanged between a client and a server. In Nginx, headers can be added, modified, or removed with: add_header <name> <value> [always]; Key Nginx Headers 1. Content-Security-Policy (CSP) Restricts which resources (JS, CSS, images) can be loaded. Example: add_header Content-Security-Policy "default-src 'self';"; 2. X-Frame-Options Prevents clickjacking by blocking iframes. add_header X-Frame-Options "SAMEORIGIN"; 3. X-Content-Type-Options Stops MIME type sniffing. add_header X-Content-Type-Options "nosniff"; 4. Strict-Transport-Security (HSTS) Forces HTTPS connections. ...

Buildah Tutorial: Creating Containers Without Docker Buildah is a Linux utility for building and managing containers compatible with OCI (Open Container Initiative). Unlike Docker, Buildah does not require a daemon, making it perfect for scripts and CI/CD pipelines. Installing Buildah On Ubuntu/Debian: sudo apt update sudo apt install -y buildah RHEL/CentOS: sudo yum install -y buildah Key Commands 1. Create new container buildah from ubuntu:24.04 This creates a new container based on the Ubuntu image and returns a unique container ID. ...

🚀 How to Use Gradle: Simple Guide for Beginners Gradle is a powerful build automation tool used for Java, Kotlin, and Android projects — and even beyond. It helps you automate tasks like compiling code, managing dependencies, testing, and packaging applications. 🧱 What is Gradle? Gradle is both flexible and fast. It’s based on Groovy or Kotlin DSL, and unlike Maven, it doesn’t force you to follow strict XML-based structures. You can think of it as a tool that builds, tests, and deploys your code with minimal configuration. ...

What is a Data Lake in Simple Terms A Data Lake is a storage system where you can keep data in its raw format: structured (like database tables), semi-structured (JSON, XML), and even unstructured (logs, videos, images). The main idea is: you don’t need to clean and organize data upfront. You store everything “as is,” and later, when you analyze it, you apply structure and rules as needed. Data Lake vs Data Warehouse Data Warehouse (DWH) — data is cleaned and transformed before storage (ETL). Data Lake — raw data is stored first, and structure is applied later (ELT). Think of it this way: ...

What is Cloud and What Types of Clouds Exist Cloud computing is a model for delivering computing resources over the Internet. Instead of buying and maintaining your own servers, you rent resources in the cloud and use them on demand. Main Types of Clouds Public Cloud Provided by third-party providers (AWS, Azure, Google Cloud). You rent resources and pay only for what you use. Great for startups and scalable applications. Private Cloud ...