Infrastructure automation

The goal of this part is to automate infrastructure deployments by using these tools:

• Terraform: allows us to define infrastructure as code and easily deploy it (by spawning machines automatically)
• Ansible: deploys all the software stack on a server after it has been deployed by Terraform
• terraform-inventory: a Go app that converts the Terraform state file into an Ansible playbook

Terraform

All the stuff resides on terraform folder.

For our needs, Terraform handles Public Cloud Instances deployments on OVH thanks to the OpenStack API and also handles DNS entry creation/deletion.

Before using it, please read the Terraform doc on their website and populate the terraform.tfvars with the API credentials .

cd terraform
cp terraform.tfvars.default terraform.tfvars

# Add your credentials
vim terraform.tfvars

# Plan and apply your deployment
terraform plan
terraform apply

Please note that Terraform keeps a file named terraform.tfstate which is updated after each deployment, in order to keep track of the currently deployed machines. Thus, if you want to run a deployment from a different machine that the one that spawned the initial infra, you have to share the terraform.tfstate before. Otherwise, a new infra will be deployed!

Ansible

Todo