Deployable

This is an example distributed Elixir app with a pre-baked CloudFormation VPC stack, ready for use on AWS. Some features:

• Automatic deployment with CodeDeploy
• Building/releasing using distillery
• Multiple availability zones for fault tolerance
• Auto-scaling and load-balancing
• Networked Elixir nodes with discovery
• Live upgrades for the Elixir apps

Features I'm hoping to add:

• Helpers for remote monitoring over SSH
• Solutions for logging/monitoring/metrics
• Database with RDS

Usage

• Make an AWS key pair for the instances
• Make a KMS key to encrypt secrets
• Make 2 S3 buckets: one for code deployments, and one for server config
• Change variables in script/vars accordingly
• script/setup_secrets to set up secrets config
• script/put_secrets (after editing priv/secrets.txt) to put initial secrets
• script/create_stack to make the initial release/stack (you can also use this script to update the stack if you make changes to the template)
• script/release to cut a new release and deploy (make sure the app version is incremented)

Caveat Emptor

I am not an expert in AWS, networking, or security, so it is highly likely that this is not production-ready (I made it for the learning experience). Use with caution!

Acknowledgments

The template for the CloudFormation stack is based on sample code from AWS In Action (Manning, 2015).