You need the terraform binary, e.g. brew install terraform.
You need an SSH key. The private key needs to be chmod to 600.
You need the cloud provider credentials. These will be entered on the command line.
The terraform provider for GCE requires access to an 'account.json' file - this is available from GCE's web interface in the 'credentials' section.
The GCE provider for Terraform does not currently have support for managing DNS records, and as such we have created a wrapper around Google's 'gcloud' command which allows us to create DNS records as part of a local-provisioner step. It is necessary to manually install the 'gcloud' command line utility and authenticate it before running Terraform for the first time.
$ curl https://sdk.cloud.google.com | bash
$ gcloud components update
$ gcloud auth activate-service-account --key-file ~/path/to/account.json
$gcloud config set project <your_project_name>
Once the above steps are complete, performing a gcloud compute instances list will confirm that authentication is working as expected.
Change into one of the provider sub-directories before executing terraform commands.
For usage, refer to the Terraform CLI doc.
We have found that terraform destroy doesn't work reliably. Possible cause this issue. Workaround is to delete manually via the console.