我有一个模板文件，用于创build一个configuration文件，然后用于帮助提供一个实例。
如果模板文件发生变化，我希望“terraform apply”触发configuration文件的重新生成，然后当configuration文件发生变化时，我希望触发实例的重新生成。
有没有办法用terraform做到这一点？
data "template_file" "instance_config" { template = "${file("${path.module}/instance_config.tpl")}" vars { private_cidr_block = "${var.private_cidr_block}" } } resource "null_resource" "export_instance_config" { provisioner "local-exec" { command = "cat >instance_config.json <<EOL\n${data.template_file.instance_config.rendered}\nEOL" } } resource "aws_instance" "vpn" { ami = "${data.aws_ami.my_ami.id}" instance_type = "t2.micro" key_name = "mykey" subnet_id = "${var.subnet_id}" associate_public_ip_address = true security_groups = ["${aws_security_group.instance_sg.id}"] connection { type = "ssh" user = "myuser" private_key = "${file("mykey.pem")}" agent = false } provisioner "file" { source = "instance_config.json" destination = "/home/myuser/instance_config.json" } provisioner "remote-exec" { inline = [ "sudo /usr/bin/configure_instance /home/myuser/instance_config.json" ] } } 通过利用这里列出的提供者的特性，可以降低复杂性并修复依赖链。
具体来说，我认为你可以删除null_resourceconfiguration文件，而是执行以下操作：
data "template_file" "instance_config" { template = "${file("${path.module}/instance_config.tpl")}" vars { private_cidr_block = "${var.private_cidr_block}" } } resource "aws_instance" "vpn" { ami = "${data.aws_ami.my_ami.id}" instance_type = "t2.micro" key_name = "mykey" subnet_id = "${var.subnet_id}" associate_public_ip_address = true security_groups = ["${aws_security_group.instance_sg.id}"] connection { type = "ssh" user = "myuser" private_key = "${file("mykey.pem")}" agent = false } provisioner "file" { content = "${data.template_file.instance_config.rendered}" destination = "/home/myuser/instance_config.json" } provisioner "remote-exec" { inline = [ "sudo /usr/bin/configure_instance /home/myuser/instance_config.json" ] } }