Category Archives: Tech.

Kubernetes: Limits and Requests

Posted on January 2, 2021 by Jay V

Recently at work, one of our workloads on kubernetes was erroring out a lot and grafana showed that the pods were being CPU-throttled 50-60% of the time. That was weird, because the pods were nowhere close to hitting their limits. … Continue reading →

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Jenkins agents on AWS EKS

Posted on May 31, 2020 by Jay V

The steps outlined here should help you setup Jenkins agents on AWS EKS clusters. The agents are one-time only. In other words, every build gets a fresh agent and then it is thrown away. The big advantage with Kubernetes is … Continue reading →

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AWS S3 Bucket Policy to Only Allow Encrypted Object Uploads

Posted on February 7, 2017 by Jay V

Amazon S3 supports two types of encryption (server-side-encryption or SSE) for security of data at rest — AES256, and AWS/KMS. AES256 is termed as S3-managed encryption keys [SSE-S3], whereas, KMS is termed, well, SSE-KMS where in the customer manages their … Continue reading →

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DC/OS Exhibitor on S3 – Issues & Workarounds

Posted on December 22, 2016 by Jay V

If you want basic resiliency around your DC/OS master nodes when hosting them on AWS, you’ll want to have Exhibitor store its data in AWS S3. In order to do so, you’ll want to grant S3 IAM roles to your … Continue reading →

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DC/OS Kill Mesos Framework

Posted on December 8, 2016 by Jay V

You want to kill a Mesos framework but you’ve no idea how? You’ve looked at this page but it still doesn’t make sense? Then here’s what you need to do to kill a framework on Mesos. In my case, I … Continue reading →

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[How To] Java Heap Dump and Stack Trace

Posted on December 5, 2016 by Jay V

Here’s how you can quickly get java heap dump and stack dump on Amazon Linux with Java 8. Your mileage with these commands may vary. First, find the process ID (pid) and user for the java process that you want … Continue reading →

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S3 access from VPC or Corporate IP

Posted on November 30, 2016 by Jay V

If you’ve been wanting to allow HTTP access to your favorite S3 bucket from your VPC and/or from your corporate LAN’s public IP, then this blog could help make your job easier. At the end of this, you will be … Continue reading →

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Programmatically Trigger Travis Builds on GitHub

Posted on October 11, 2016 by Jay V

Our code for this specific project (which is on GitHub) is designed to handle infrastructure creation and rebuilds. For this purpose, we wanted to to be able to trigger our Travis builds for specific branches via simple Bash scripts, based … Continue reading →

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Automating IAM Instance Profile with Ansible

Posted on June 30, 2016 by Jay V

My previous post talked about creating AWS IAM Instance Profiles so you don’t have to save keys on the instances. In this post, we’ll look at using Ansible to launch EC2 instances with IAM Instance Profiles attached to them (you … Continue reading →

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Simple Howto: AWS IAM Instance Profiles

Posted on June 23, 2016 by Jay V

For those of you looking to set up applications to run on EC2 instances without having to put credentials on the machines, there is an option. AWS has a great feature for exactly this purpose, and it’s called IAM Instance … Continue reading →

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