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Cover illustration for Why your EKS Auto Mode NodeClass keeps reverting to default

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Why your EKS Auto Mode NodeClass keeps reverting to default
Portrait of Ananya Dasgupta, SRE at One2N

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.

Cover illustration for Git was not built for multiple AI agents. Worktrees fix that.

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Git was not built for multiple AI agents. Worktrees fix that.
Portrait of Srivatsa RV, SRE at One2N

Srivatsa RV

SRE @One2N

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

Git worktrees for agentic development: give each AI coding agent its own folder and branch on one repo, so parallel chats stop fighting over one checkout.

Cover illustration for Multi-tenant SFTP: how we built a zero-ops setup on AWS Transfer Family

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Multi-tenant SFTP: how we built a zero-ops setup on AWS Transfer Family
Portrait of Kshitish Deshpande, Software Engineer at One2N

Kshitish Deshpande

Software Engineer @One2N

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

How One2N built a zero-ops multi-tenant SFTP system for a fintech client using AWS Transfer Family: one endpoint, isolated buckets, no manual server ops.

Cover illustration for My new laptop broke Slack. That's how I ended up on Bluefin.

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My new laptop broke Slack. That's how I ended up on Bluefin.
Portrait of Harsh Mishra, SRE

Harsh Mishra

SRE

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

A kernel patch broke Slack on my Dell XPS. Here's how that led me to Bluefin, immutable Linux, bootc, and OCI images and why it solved my problem for good.

Cover illustration for GitOps for Kafka: how we governed 78 clusters without breaking production

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GitOps for Kafka: how we governed 78 clusters without breaking production
Portrait of Harshwardhan Mehrotra, SRE at One2N

Harshwardhan Mehrotra

SRE @One2N

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

GitOps for Kafka with Jikkou: how a small platform team governed 78 clusters, 10,000+ topics and Kafka 0.8.2 to 4.x, replacing 3 to 5 day topic tickets.

Cover illustration for From aircraft to cloud: my experience with the SRE Bootcamp

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From aircraft to cloud: my experience with the SRE Bootcamp
Portrait of Pankaj Goriya, SRE at One2N

Pankaj Goriya

SRE @One2N

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

An aircraft maintenance engineer's review of One2N's SRE Bootcamp: how the hands-on exercises built DevOps and SRE fundamentals, and advice for newcomers.

Cover illustration for Debugging KubeVPN's DNS resolution failures

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Debugging KubeVPN's DNS resolution failures
Portrait of Nilesh D, Software Engineer at One2N

Nilesh D

Software Engineer @One2N

Portrait of Chinmay Naik, CEO at 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.

Cover illustration for What happens when you run Terraform commands?

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What happens when you run Terraform commands?
Portrait of Sahil Joseph, Staff SRE at One2N

Sahil Joseph

Staff SRE @One2N

Portrait of Saurabh Hirani, Principal SRE at One2N

Saurabh Hirani

Principal SRE @One2N

What happens when you run Terraform commands: how Terraform core talks to provider plugins over gRPC, credential handling, state locking and debugging.

Cover illustration for Daily driving Omarchy and Hyprland as a CTO

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Daily driving Omarchy and Hyprland as a CTO
Portrait of Jaideep Khandelwal, CTO at One2N

Jaideep Khandelwal

CTO @One2N

A CTO's review of daily driving Omarchy, DHH's Arch-based Linux with Hyprland preconfigured, after macOS: what works, what breaks and who should use it.

Cover illustration for DORA metrics: useful or fluff

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DORA metrics: useful or fluff
Portrait of Jaideep Khandelwal, CTO at One2N

Jaideep Khandelwal

CTO @One2N

DORA metrics without context invite Goodhart's Law gaming. One team shipped 2,500 deploys a month with long lead times. How to tie DORA to business goals.

Cover illustration for GitHub runners fundamentals and self-hosted runner setup

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GitHub runners fundamentals and self-hosted runner setup
Portrait of Rajesh Jangid, SRE

Rajesh Jangid

SRE

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

What GitHub runners are, how GitHub-hosted and self-hosted runners differ, and how to set up a self-hosted GitHub Actions runner.

Cover illustration for EKS upgrade best practices: how to upgrade EKS clusters safely

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EKS upgrade best practices: how to upgrade EKS clusters safely
Portrait of Aashi Rathore, SRE at One2N

Aashi Rathore

SRE @One2N

Portrait of Spandan Ghosh, Content at 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.

Cover illustration for AWS SSM port forwarding to private EC2 without SSH or bastions

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AWS SSM port forwarding to private EC2 without SSH or bastions
Portrait of Harsh Mishra, SRE

Harsh Mishra

SRE

AWS SSM port forwarding to EC2 in private subnets with Session Manager, with no open SSH port or bastion. Covers the IAM role, SSM Agent and endpoints.

Cover illustration for Accessing private EC2 Instances without keys or passwords

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Accessing private EC2 Instances without keys or passwords
Portrait of Adarsh Raj, SRE

Adarsh Raj

SRE

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

Access private EC2 instances without SSH keys or passwords using AWS Systems Manager Session Manager: no public IPs, no inbound rules, and no shared keys.

Cover illustration for Using UTM and Vagrant for dev environments on Apple Silicon

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Using UTM and Vagrant for dev environments on Apple Silicon
Portrait of Srivatsa RV, SRE at One2N

Srivatsa RV

SRE @One2N

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

VirtualBox no longer supports M-series Macs. How to run Vagrant with UTM to spin up reproducible local dev environments on Apple Silicon, tested on an M3.

Cover illustration for How to use multiple GitHub accounts on one machine

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How to use multiple GitHub accounts on one machine
Portrait of Saurabh Hirani, Principal SRE at One2N

Saurabh Hirani

Principal SRE @One2N

Use multiple GitHub accounts on one machine: a separate SSH key per account, SSH host entries, and includeIf in your Git config to pick the right identity.

Cover illustration for Understanding MLOps from a software engineers' perspective

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Understanding MLOps from a software engineers' perspective
Portrait of Harsh Mishra, SRE

Harsh Mishra

SRE

Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

Portrait of Chinmay Naik, CEO at One2N

Chinmay Naik

CEO @One2N

Portrait of Jaideep Khandelwal, CTO at One2N

Jaideep Khandelwal

CTO @One2N

MLOps for software engineers is DevOps plus data engineering and ML. The MLOps lifecycle, knowledge silos, automation, versioning and experiment tracking.

Cover illustration for Database schema migrations: a practical guide to managing schema changes

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Database schema migrations: a practical guide to managing schema changes
Portrait of Spandan Ghosh, Content at One2N

Spandan Ghosh

Content @One2N

Database schema migrations without manual steps: versioned migrations, running them in every deploy, and tools like Flyway, Liquibase and ORM migrations.

Cover illustration for Achieving CI/CD with previews for your static website hosted on S3

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Achieving CI/CD with previews for your static website hosted on S3
Portrait of Drasti Kaurav, SRE at One2N

Drasti Kaurav

SRE @One2N

CI/CD for a static website on S3 with preview environments: automated builds and deploys without developer AWS keys, plus CloudFront cache invalidation.

Cover illustration for Automate RDS secret management using AWS Secrets Manager

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Automate RDS secret management using AWS Secrets Manager
Portrait of Siddharth Shashikar, SRE at One2N

Siddharth Shashikar

SRE @One2N

Manage and rotate RDS credentials with AWS Secrets Manager: compare ways to store RDS secrets, then automate creation and rotation with Terraform.

Cover illustration for Moving from traditional CD pipelines to GitOps

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Moving from traditional CD pipelines to GitOps
Portrait of Jaideep Khandelwal, CTO at One2N

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.

Cover illustration for Terraform: best practices & gotchas

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Terraform: best practices & gotchas
Portrait of Siddharth Shashikar, SRE at One2N

Siddharth Shashikar

SRE @One2N

Terraform best practices and gotchas for infrastructure as code: directory structure, module organisation, naming conventions and state management.

Cover illustration for Centralized VPN solutions for cloud and on-premise

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Centralized VPN solutions for cloud and on-premise
Portrait of Sagar Rakshe, SRE

Sagar Rakshe

SRE

A centralized VPN for cloud and on-premise networks: how a Pritunl cluster replaced shared OpenVPN profiles and cut a client's VPN issues by more than 90%.

Cover illustration for Homogenous build setups for local and CI workflows

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Homogenous build setups for local and CI workflows
Portrait of Sitaram Shelke, SRE

Sitaram Shelke

SRE

Homogenous build setups give local and CI one interface to build and test. How we used Makefiles and Bash with Jenkins so builds match everywhere.

Cover illustration for Iptables, Firewalls, Linux blast from the past!

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Iptables, Firewalls, Linux blast from the past!
Portrait of Jaideep Khandelwal, CTO at One2N

Jaideep Khandelwal

CTO @One2N

An iptables guide for SREs: syntax, tables, chains and targets on Netfilter, plus using a machine as a NAT device and resolving NAT IPs across VLANs.

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