Harikrishnan JR
I build, break, and automate infrastructure at scale. Sharing real-world Kubernetes deep dives, CKA prep notes, troubleshooting war stories, and AI + DevOps experiments.
Talks & Knowledge Transfer
Sessions I've presented internally and externally
MongoDB Upgrade with Mongosync
Walked the team through a zero-downtime MongoDB upgrade from 5.0 to 8.0 using Mongosync for continuous cluster-to-cluster replication, covering setup, cutover strategy, and verification.
Latest Posts
From the trenches of production
What Are Virtual Machines, and Why Do They Matter More in the AI Era?
What a virtual machine is, how it works, the benefits and common uses of VMs, and where they are heading with AI, edge computing and hybrid cloud.
How SSH Actually Works: From TCP Handshake to Encrypted Shell
What really happens between typing `ssh user@host` and getting a shell: version exchange, key exchange, host verification, authentication, and encrypted channels, explained step by step.
Zero-Downtime MongoDB Migration: 5.0 to 8.0 with Mongosync and Blue-Green Deployment
The problem, in one line: I needed to upgrade a production MongoDB cluster from version 5.0 to 8.0 — without taking the live application down. ## Wh…
Want to know more about my journey?
From first kubectl apply to managing multi-cloud Kubernetes clusters — I document everything.