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Hello, My name is Amit - I am interested in programming, software tools, systems and infrastructure. A lot of what I explore in software makes it to my blog posts, articles, books , talks and GitHub repositories. If you would like to get an email everytime I write something new, please subscribe to my newsletter. You can contact me via email , on Twitter and on LinkedIn.

Blog posts

My post recent posts are below. So far, I have written about C, Fedora, Golang, Infrastructure, Python and various others.

Examples of consuming data in Golang templates

While working on creating a template file for a Golang project, I wanted to better understand how to work with data in Golang templates as available via the html/template package. In this post, I discuss a few use cases that may arise.

Accessing a variable

Let's consider our first …

Download a file using `curl` - How hard can it get?

I wanted to download the prometheus binary using curl. My first attempt:

$ curl https://github.com/prometheus/prometheus/releases/download/v2.4.0/prometheus-2.4.0.linux-amd64.tar.gz
<html><body>
You are being <a href="https://github-production-release-asset-2e65be.s3.amazonaws.com/6838921/5c87dc00-b5d1-11e8-8a3a-fd29b54e0c60?X-Amz-Algorithm=AWS4-HMAC-SHA256&amp;X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20180914%2Fus-east-1 …

Docker userns-remap and system users on Linux

In this post, we learn how we can make use of docker's user namespacing feature on Linux in a CI/build environment to avoid running into permission issues. Using user namespacing also keeping things a bit sane without adopting sub-optimal alternatives.

Introduction

Let's consider that we are leveraging docker …

AWS Private Route53 DNS and Docker containers

AWS Route 53 private hosted zones enable you to have private DNS names which only resolve from your VPC. This is great when working from EC2 instances since everything is setup and ready to go. This however becomes a problem when using docker containers on a systemd system. On such …

AWS Network ACLs and ephermal port ranges

In this post, I discuss a problem (and its solution) I encountered while working with AWS (Amazon Web Services) Network ACLs, docker containers and ephermal port ranges.

Infrastructure setup

A Linux EC2 instance with docker engine running in a VPC with inbound and outbound traffic controlled by Network ACLs. I …

Managing AWS lambda functions from start to finish with Terraform

AWS lambda functions look deceptively simple. The devil is in the details though. Once you have written the code and have created a .zip file, there's a few more steps to go.

For starters, we need an IAM profile to be defined with appropriate policies allowing the function to access …

On running Windows Docker containers

I went into working with Windows docker containers after having been worked with docker on Linux exclusively. My goal was to have isolated environments for each build in a continuous integration pipeline. That is, each build happens on an exclusive build host (AWS EC2 VM instance) and every database and …

Powershell: Measuring seconds elapsed

I have been working with PowerShell for three months now, and my approach to using it has been pretty much google and trial - copying things, modifying things till they work and learning new things on the way. This post talks about a discovery which I made today.

I had a …

Using Terraform with consul remote backend

In my new post on the CodeShip blog, I discuss configuring terraform with a consul remote backend. The entire aricle is available here.

The accompanying git repository is here. Please file an issue if you have trouble following the setup.

Pre-release Fedora Scientific Vagrant Boxes

I am very excited to share that sometime back the Fedora project gave the go ahead on my idea of making Fedora Scientific available as Vagrant boxes starting with Fedora 29. This basically means (I think) that using Fedora Scientific in a virtual machine is even easier. Instead of downloading …