This is a little Go app which generates an dynamic Ansible ansible inventory from a [Terraform] tf state file. It allows one to spawn a bunch of instances with Terraform, then (re-)provision them with Ansible. Currently, only AWS, DigitalOcean, CloudStack, VMware, OpenStack, Google Compute Engine are supported.
On OSX, install it with Homebrew:
brew install https://raw.github.com/adammck/terraform-inventory/master/homebrew/terraform-inventory.rb
This is only a tiny tool, so it's not in the main Homebrew repo. Feel free to add it, if you think that would be useful.
Alternatively, you can download a release suitable
to your platform and unzip it. Make sure the terraform-inventory binary is executable and you're ready to go.
If your Terraform state file is named terraform.tfstate (the default), cd to
it and run:
ansible-playbook --inventory-file=terraform-inventory deploy/playbook.yml
This will provide the resource names and IP addresses of any instances found in the state file to Ansible, which can then be used as hosts patterns in your playbooks. For example, given for the following Terraform config:
resource "digitalocean_droplet" "my_web_server" {
image = "centos-7-0-x64"
name = "web-1"
region = "nyc1"
size = "512mb"
}
The corresponding playbook might look like:
- hosts: my_web_server
tasks:
- yum: name=cowsay
- command: cowsay hello, world!
Note that the instance was identified by its resource name from the Terraform config, not its instance name from the provider. On AWS, resources are also grouped by their tags. For example:
resource "aws_instance" "my_web_server" {
instance_type = "t2.micro"
ami = "ami-96a818fe"
tags = {
Role = "web"
Env = "dev"
}
}
resource "aws_instance" "my_worker" {
instance_type = "t2.micro"
ami = "ami-96a818fe"
tags = {
Role = "worker"
Env = "dev"
}
}
Can be provisioned separately with:
- hosts: role_web
tasks:
- command: cowsay this is a web server!
- hosts: role_worker
tasks:
- command: cowsay this is a worker server!
- hosts: env_dev
tasks:
- command: cowsay this runs on all dev servers!
Ansible doesn't seem to support calling a dynamic inventory script with params,
so if you need to specify the location of your state file, set the TF_STATE
environment variable before running ansible-playbook, like:
TF_STATE=deploy/terraform.tfstate ansible-playbook --inventory-file=terraform-inventory deploy/playbook.yml
Alternately, if you need to do something fancier (like downloading your state file from S3 before running), you might wrap this tool with a shell script, and call that instead. Something like:
#!/bin/bash
terraform-inventory $@ deploy/terraform.tfstate
Then run Ansible with the script as an inventory:
ansible-playbook --inventory-file=bin/inventory deploy/playbook.yml
It's just a Go app, so the usual:
go get github.com/adammck/terraform-inventory
To test against an example statefile, run:
terraform-inventory --list fixtures/example.tfstate
terraform-inventory --host=52.7.58.202 fixtures/example.tfstate
To update the fixtures, populate fixtures/secrets.tfvars with your DO and AWS
account details, and run fixtures/update. To run a tiny Ansible playbook on
the example resourecs, run:
TF_STATE=fixtures/example.tfstate ansible-playbook --inventory-file=terraform-inventory fixtures/playbook.yml
You almost certainly don't need to do any of this. Use the tests instead.
Development of #14, #16, and #22 was generously sponsored by Transloadit.
MIT.