How to interpolate in Terraform

Terraform
5

Hi @iamdempa,

That seems like a good use-case for the templatefile function, which use Terraform’s string template syntax with templates in external files.

For example, you could create a new file roles.ini.tmpl (or whatever you want) in the same directory as your module’s .tf files with the following content:

[kube-master]
%{ for addr in master_ip_addrs ~}
${addr}
%{ endfor ~}
[kube-minion]
%{ for addr in minion_ip_addrs ~}
${addr}
%{ endfor ~}

Then replace your content expression with a call to render that template:

  content = templatefile("${path.module}/roles.ini.tmpl", {
    master_ip_addrs = aws_instance.kubernetes_master[*].public_ip
    minion_ip_addrs = aws_instance.kubernetes_minion[*].public_ip
  })