Requirements for infrastructure provisioner
Before proceeding to the existing solutions, let's lay out the list of most important requirements for a tool such as this, so we are able to choose it wisely.
Supports a wide variety of services
AWS alone already has dozens of entities to take care of. Other players (DigitalOcean, Google Cloud, Microsoft Azure, and so on) increase this number significantly. And if you want to add smaller SaaS providers to the game, you get hundreds of resources to manage.
Idempotency
Same as with a single server configuration, reapplying infrastructure template should not do the job twice. If you have a template defining 50 different resources, from EC2 instances to S3 buckets, then you do not want to duplicate or recreate ...
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