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Terraform is a tool developed by HashiCorp that allows you to build your infrastructure using code. At Hootsuite, we are using Terraform to build new infrastructure in an auditable and maintainable way.

Terraform makes spinning up infrastructure less painful and making changes less scary. By describing infrastructure as code, spinning a new server turns into submitting a pull request and rolling back to a previous state of infrastructure becomes as easy as reverting a commit. Terraform is not limited to AWS, it can provision a whole suite of AWS products and can integrate with a growing list of providers including Digital Ocean, OpenStack and more.

Using Terraform as a systems developer is a good start for remodelling your infrastructure as code. However, to really scale you need to be able to have multiple people work on your terraform stacks. This problem is solved by Terraform’s remote state. Remote state allows you to store the state file for a stack in some third party storage provider so it can be shared across developers. This is in contrast to what you would have if you did not use remote state, that is, each developer with their own statefile. As you could imagine, this would get really messy as people start to clobber each other’s changes.

Terraform provides users with a couple of options when it comes to remote state backends including: S3, Consul and HTTP. S3 is a particularly interesting backend to use since you can version the contents of buckets. Conceivably, then you could also version control states of your infrastructure. Read More …