Provisioners Without a Resource
If you need to run provisioners that aren't directly associated with a specific
resource, you can associate them with a terraform_data.
Instances of terraform_data are treated
like normal resources, but they don't do anything. Like with any other resource
type, you can configure provisioners
and connection details on a
terraform_data resource. You can also use its input argument, triggers_replace argument, and any
meta-arguments to control exactly where in the dependency graph its
provisioners will run.
Important: Use provisioners as a last resort. There are better alternatives for most situations. Refer to Declaring Provisioners for more details.
Example usage
resource "aws_instance" "cluster" { count = 3 # ...}resource "terraform_data" "cluster" { # Replacement of any instance of the cluster requires re-provisioning triggers_replace = aws_instance.cluster[*].id # Bootstrap script can run on any instance of the cluster # So we just choose the first in this case connection { host = aws_instance.cluster[0].public_ip } provisioner "remote-exec" { # Bootstrap script called with private_ip of each node in the cluster inline = [ "bootstrap-cluster.sh ${join(" ", aws_instance.cluster[*].private_ip)}", ] }}