Automating infrastructure on cloud is an interesting topic, one that is both intriguing and challenging at the same time. With a proper arsenal of DevOps tools, this becomes pretty straightforward. In this blog post, we will attempt to create an EMQ cluster ( Erlang MQTT ) in AWS using popular HashiCorp tools like Packer and Terraform . For a simple guide to setup EMQ cluster using Oracle VirtualBox, please refer to this post . Additionally, it is assumed that the reader is moderately versed with technologies like Packer & Terraform and has basic understanding of AWS networking & EC2 instances. Before we proceed into the technical nitty-gritty, here's a brief overview of what we will try to achieve. Crux of the matter First of all, we will 'bake' an Amazon Machine Image or AMI for short, using Packer. This AMI will have EMQ (emqttd) installed. Subsequently, we'll use this custom AMI in our Terraform script to spin up EC2 instances and create...