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Case Studies

Cover image for the case study Migrating from AWS Glue to Self-Hosted ClickHouse: 70% Cost Reduction for a Fintech Clien

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Migrating from AWS Glue to Self-Hosted ClickHouse: 70% Cost Reduction for a Fintech Client.

How One2N cut a fintech client's analytics spend from $13K to $4K/month by replacing AWS Glue, DMS, and Athena with a self-hosted ClickHouse stack.

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Journey of moving VM-based workloads to Kubernetes.

How Flip, a fintech in Indonesia, migrated VM-based workloads to Alibaba Cloud's managed Kubernetes (ACK) for autoscaling and reduced operational toil.

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AutoScaling eKYC Machine Learning workloads to 2 Million req/day.

How One2N autoscaled eKYC ML workloads to 2 million requests per day with 90% cost savings, 99% availability, and sub-3-second P95 API latency.

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Pull Request Based Ephemeral Preview Environments on Kubernetes.

How One2N helped Manatal migrate from Heroku to Kubernetes and set up PR-based ephemeral preview environments for frontend and backend services.

Blogs

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Why your EKS Auto Mode NodeClass keeps reverting to default

Ananya Dasgupta

SRE @One2N

EKS Auto Mode reverted our default NodeClass after Argo CD synced secondary CIDR pod subnets. Why Auto Mode owns that object and what to change instead.

September 21, 2026 | 6 min read

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How to evaluate AI SRE agents for production?

Hemant Kumar

Staff SRE @One2N

How we evaluate AI SRE agents before they touch a production incident, applied to an OpenSRE v0.1 PoC and scored on how fast it helps isolate a fault.

August 11, 2026 | 12 min read

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Hardening Kubernetes security with Istio ambient mode on flat networks

Harshwardhan Mehrotra

SRE @One2N

Spandan Ghosh

Content @One2N

Istio Ambient mode on a flat EKS Hybrid network: how we rebuilt workload isolation with mTLS, SPIFFE identity, egress control and NetworkPolicies.

June 1, 2026 | 7 min read

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How one parameter stalled Postgres replication with Debezium for 3 weeks

Harsh Mishra

SRE

A story about WAL segments, missing events, and the one line of SQL that should have been there from the start.

April 28, 2026 | 7 min read

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The gotchas of OTel Collector processors in Kubernetes

Sanket Rajgiri

SRE @One2N

Spandan Ghosh

Content @One2N

OTel Collector processor gotchas in Kubernetes: batching to stop 429s, crashes in spikes, noise filters, k8s enrichment, sampling and two-tier collectors.

January 26, 2026 | 6 min read

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Debugging KubeVPN's DNS resolution failures

Nilesh D

Software Engineer @One2N

Chinmay Naik

CEO @One2N

Debugging KubeVPN DNS on macOS: go.dev failed to resolve because KubeVPN sent it to a dev namespace. scutil --dns found it; resetting adapter DNS fixed it.

September 30, 2025 | 3 min read

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Optimizing MongoDB backup strategy: lessons from achieving a 1-Hour RPO

Mihir Bhagwat

SRE @One2N

Sanket Rajgiri

SRE @One2N

Spandan Ghosh

Content @One2N

MongoDB backup strategy for a 1-hour RPO on GKE with the Community Operator: daily mongodump full dumps and hourly oplog backups for point-in-time restore.

May 14, 2025 | 8 min read

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EKS upgrade best practices: how to upgrade EKS clusters safely

Aashi Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

EKS upgrade checklist from our v1.23 to v1.30 move: control plane checks, VPC CNI, CoreDNS and kube-proxy add-ons, Velero backups and node group upgrades.

March 25, 2025 | 5 min read

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Gotchas to avoid when using AWS spot instances in production

Aashi Rathore

SRE @One2N

Spandan Ghosh

Content @One2N

AWS spot instances in production on EKS: two-minute termination notices, ignored PodDisruptionBudgets, slow replacement capacity and a real outage we had.

February 24, 2025 | 4 min read

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Karpenter vs Cluster Autoscaler for Kubernetes node scaling

Rahul H Bhatia

SRE

Spandan Ghosh

Content @One2N

Karpenter vs Cluster Autoscaler: how each scales Kubernetes nodes, from predefined node groups and priority expanders to provisioning and cost trade-offs.

November 8, 2024 | 7 min read

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Setting up CloudWatch alerts for EKS clusters: insights and solutions

Mihir Bhagwat

SRE @One2N

Saurabh Hirani

Principal SRE @One2N

Spandan Ghosh

Content @One2N

CloudWatch alerts for EKS node readiness with Container Insights: per-node alarms for static nodes, then Metric Insights and MIN(MIN) for autoscaled ones.

August 30, 2024 | 6 min read

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Moving from traditional CD pipelines to GitOps

Jaideep Khandelwal

CTO @One2N

Moving from traditional CD pipelines to GitOps: shared Jenkins credentials and cross-environment access, GitOps principles, and how we adopted Flux CD.

June 17, 2023 | 4 min read

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Kubernetes HPA on external metrics with Prometheus Adapter

Akshay Srivastava

SRE @One2N

Kubernetes HPA on external metrics: scaling pods on Redis queues from a server outside the cluster with Prometheus Adapter, plus CPU and memory metrics.

October 14, 2022 | 6 min read

Talks

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ABC of LLMOps - What does it take to run self-hosted LLMs｜Rootconf mini 2024

Jaideep Khandelwal

CTO @One2N

Lessons from deploying open-source LLMs on Kubernetes GPUs, managing vector databases and building RAG apps, from Rootconf mini 2024.

February 5, 2025 | 31 min

Watch Talk

A beginners guide to understand Kubernetes using Restaurant Analogy | DevOpsDays Kerala 2024

Chinmay Naik

CEO @One2N

Kubernetes is 10+ years old but still hard to learn. This talk uses a restaurant analogy to make K8s approachable and drive better adoption.

September 28, 2024 | 29 min

Watch Talk

Introducing Cloudlens - Cloud Console in your terminal

Chinmay Naik

CEO @One2N

Chinmay Naik introduces Cloudlens, an open source k9s-style terminal UI for exploring AWS and GCP resources, from Google DevFest Chennai 2023.

February 21, 2024 | 15 min

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