TECHNICAL WRITING
Practical writing about DevOps, cloud infrastructure, Linux, CI/CD, Kubernetes, automation, and the operational lessons behind reliable systems.
How gajan.dev/files encrypts a file of up to 100 MB in the browser, stores only ciphertext on a Contabo K3s volume, keeps the key in the URL fragment, and charges the sender once through Ideamart CaaS.
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How gajan.dev/clipboard encrypts secrets in the browser, stores only ciphertext on Contabo K3s with memory-only Valkey, and burns the record on first read, with the design choices behind each decision.
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A practical guide to AWS Route 53 and TLS certificates covering hosted zones, record types, alias records, routing policies, health checks, ACM issuance and validation, certificate chains, SNI, and HTTPS troubleshooting.
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A practical RHEL 10.2 and VirtualBox homelab build with three K3s server nodes, embedded etcd, Prometheus, Grafana, and secure Cloudflare Tunnel access.
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A practical guide to AWS Application Load Balancers covering architecture, listeners, routing, target groups, health checks, TLS, monitoring, troubleshooting, and hands-on labs.
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A practical guide to AWS IAM roles, trust and permissions policies, temporary credentials, least-privilege design, cross-account access, PassRole, and AccessDenied troubleshooting.
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A practical, production-focused guide to AWS VPC design, routing, NAT gateways, security controls, packet flow, troubleshooting, and multi-AZ networking.
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Most people working in tech have heard of CI/CD pipelines, but beginners often see them as some kind of DevOps magic.
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If you want to host your website with a lightweight web server, then Nginx is your solution.
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If you want to setup SSH to remotely connect to machines then this guide is for you:
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If you have a slow internet connection or are limited on bandwidth quota and want to clone docker images between repositories without downloading them to your local machine, then this guide…
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If you are learning or working in the cloud, chances are that you might have heard about GitOps. So what is GitOps?
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Use ffuf with a comprehensive wordlist to enumerate the subdomains
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I am keeping this simple, first of all you get access to the source code.
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The plan is to set up a High Available (HA) cluster with 3 master nodes and 5 worker nodes, using containers in a VM in your local machine. Here I am using a RHEL 8 VM. I am assuming that…
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If you are moving or upgrading to a new PC, you might also want to move the existing games without the hassle of downloading all the games again in the new PC. Or you might want to copy the…
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This guide will explore the initial steps to get started with Ansible automation in your projects. The main focus of Ansible is to automate redundant tasks that need to be performed over and…
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An easy to understand simple explanation on how MD5 works.
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Disclaimer: This information is meant for learning purposes only. We strongly discourage any illegal activities, including unauthorized hacking. We do not endorse or take responsibility for…
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