Getting started with Terraform

Notes:

• This example assumes that you will have aws credentials configured in your shell environment
• Defaults to us-east-1 region.
• You will also need to replace key_name in the commands below.

I usually configure my shell with variables like this:

export AWS_ACCESS_KEY=[redacted]
export AWS_ACCESS_KEY_ID=[redacted]
export AWS_SECRET_KEY=[redacted]
export AWS_SECRET_ACCESS_KEY=[redacted]

This CoreOS/Terraform example has the following structure:

• variables - Contains re-usable variables for the various resources
• network - Establishes the networking components (VPC, subnet, Internet Gateway)
• securitygroups - Creates the security groups for CoreOS and public-ssh access
• autoscaling - Creates launch configuration and auto scaling group for instances to run in

Planning

export ETCD_TOKEN=`curl -s http://discovery.etcd.io/new`
terraform plan -var "token=$ETCD_TOKEN" -var "key_name=XYZ"

This will output the plan for resources to be created, updated, or deleted as part of running the Terraform files.

Creation

terraform apply -var "token=$ETCD_TOKEN" -var "key_name=XYZ"

This will create all of the resources defined in Terraform and give you a small (3 node) CoreOS cluster.

Cleanup

terraform deploy -var "token=$ETCD_TOKEN" -var "key_name=XYZ"

This will delete all of the resources created by application of the Terraform plan