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Terraform 对模板的依赖

tag-icon • tag-icon terraform
Terraform 对模板的依赖

我有一个模板文件，用于创建配置文件，然后用于帮助配置实例。

如果模板文件发生变化，我希望“terraform apply”触发配置文件的重新生成，然后当配置文件发生变化时，我希望它触发实例的重新生成。

有没有办法用 Terraform 来做到这一点？

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"
    ]
  }
}

答案1

你可以利用列出的配置功能来降低复杂性并修复依赖链这里。

具体来说，我认为您可以删除null_resource供应商并执行以下操作：

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"
    ]
  }
}

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