AWS Certified Solutions Architect

Quick post – I’ve been busy studying for the AWS Certified Solutions Architect – Associate exam for the past few weeks – good news, I passed it a few days ago! Shoot me a note if you ever need some solutions architected.

I primarily did this because I’ve been using AWS for years now – but so has everyone else – this would be a differentiator. There was also a lot missing in-between the cracks (I learned how to give instances in a private subnet Internet access to install/update software without giving them public IP addresses and without spending hours reading Stack Overflow posts).

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EC2 + Route53 for Dynamic DNS

Recently I ran into a problem while working with Amazon EC2 servers. Servers without dedicated elastic IP addresses would get a different IP address every time they were started up! This proved to be a challenge when trying to SSH in to the servers.

How can I have a dynamic domain name that always points to my EC2 server?

Amazon’s Route53 came to mind. Route53, however, does not have a simple way to point a subdomain directly to an EC2 instance. You can set up load balancers between Route53 and your instance, but that’s a hassle. You can also set up an elaborate private network with port forwarding – yuck.

I wanted a simple way to set a Route53 subdomain’s A record to point to an EC2 instance’s public IP address, on startup.

Enter go-route53-dyn-dns. This is a simple Go project that solves this problem. It is a small binary that reads a JSON configuration file and updates Route53 with an EC2 instance’s public IP address.

Included in the GitHub README.md file is how to set everything up.

The project is here: go-route53-dyn-dns.