Marcio Cunha

Technical Articles

Practical articles, in-depth tutorials, and architectural insights on software engineering, AI, and systems.

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RedesDevOps•12 min

How to Check Open Ports on Your Computer Using Netstat

Learn how to audit network connections and identify active services on your own operating system using the native netstat command-line tool.

DevOps•10 min

What is a gitignore file and how to avoid uploading heavy files or passwords

Learn how the gitignore file protects your project by controlling what Git ignores. Master how to shield credentials and sensitive data against accidental public leaks.

DevOps•10 min

How to Use SSH Keys Instead of Passwords to Clone Git Repositories

Learn the step-by-step technical guide to configure SSH keys in Git and eliminate the need for passwords or personal access tokens when interacting with platforms like GitHub and GitLab.

BackendDevOps•12 min

How to Use the Curl Command to Test API Routes and Responses from the Terminal

Master the curl utility to dispatch HTTP requests, inspect network headers, debug JSON payloads, and validate API routes directly from the command line.

BackendDevOps•12 min

What is a.env file and how to securely store environment variables

Learn how .env files work in practice and discover the best strategies to protect database credentials and API keys from accidental leaks in production environments.

RedesDevOps•12 min

How to Test Real Local Network Speed Using iperf3

Learn how to evaluate the real performance of your local network infrastructure using the command-line tool iperf3, avoiding Wi-Fi bottlenecks and damaged cables.

RedesDevOps•12 min

How to Configure Static IP on Windows and Linux Without Depending on DHCP

Learn how to manually configure fixed IP addresses on Windows and Linux, ensuring stability and predictable local network access without relying on your router.

DevOpsRedes•12 min

Folder Synchronization and Backups on Linux Using Rsync

Master the rsync command in Linux to perform efficient backups and securely synchronize local or remote data incrementally.

BackendDevOps•12 min

Zero-Downtime Database Migrations Using the Expand and Contract Pattern

Learn how to modify relational database schemas in production without interrupting service by applying the step-by-step column and table expansion and contraction technique.

DevOpsArquitetura•12 min

Chaos Mesh in Kubernetes: Injecting Disk, CPU, and Network Faults in Production

Learn how to apply chaos engineering with Chaos Mesh in production Kubernetes clusters. Master the simulation of disk failures, CPU throttling, and network partitions securely.