Santosh Bitra

Technical field notes

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Practical notes on cloud infrastructure, Kubernetes, and distributed systems. Each entry links to the complete article on its original publication.

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Karpenter controller connected to Amazon EKS through Pod Identity

Featured · Medium

We Ditched IRSA for Pod Identity When Setting Up Karpenter — Here’s Exactly How We Did It

A practical account of moving from Cluster Autoscaler to Karpenter on Amazon EKS with Pod Identity, including IAM setup, authentication decisions, and troubleshooting notes.

  • Amazon EKS
  • Karpenter
  • Pod Identity
  • Kubernetes
  • AWS IAM
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Data flowing from producers through a Kafka cluster to consumers

Featured · Medium

Kafka Architecture — From Basics to Quick References of Kafka (1)

An approachable introduction to Kafka producers, clusters, consumers, data flow, and message-delivery semantics, supported by quick-reference diagrams.

  • Apache Kafka
  • Architecture
  • Event Streaming
  • DevOps
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A grocery basket beside HTTP status-code labels

Featured · Medium

Grocery Shopping with HTTP Codes

A light-hearted explanation of common HTTP status codes using a familiar grocery-shopping scenario.

  • HTTP
  • Web
  • DevOps
  • Fundamentals
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Kubernetes control plane coordinating worker nodes and pods

Featured · Medium

Kubernetes — Practical HandNotes for DevOps Engineer (Part-1)

Practical notes on Kubernetes architecture, control-plane and worker-node components, request flow, foundational kubectl commands, and cluster setup resources.

  • Kubernetes
  • Architecture
  • kubectl
  • DevOps
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Kubernetes workloads arranged as a second set of practical notes

Featured · Medium

Kubernetes — Practical HandNotes for DevOps Engineer (Part-2)

The second set of practical Kubernetes notes, continuing the series with workload and day-to-day cluster concepts for DevOps engineers.

  • Kubernetes
  • DevOps
  • Containers
  • Operations
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