在 user_data 提供者模板文件中访问 Terraform 变量

问题描述

我正在使用 terraform 启动一个 aws_launch_configuration 实例.

I am launching a aws_launch_configuration instance using terraform.

我正在为 user_data 变量使用 shell 脚本，如下所示:

I'm using a shell script for the user_data variable, like so:

resource "aws_launch_configuration" "launch_config" {
    ...
     user_data                     = "${file("router-init.sh")}"
    ....
}

在这个 router-init.sh 中，我想做的一件事是访问我通过 terraform 启动的其他实例的 IP 地址.

Within this router-init.sh, one of the things I would like to do, is to have access to the ip addresses for other instances I am launching via terraform.

我知道我可以使用 splat 访问该实例的所有 IP 地址，例如:

I know that I can use a splat to access all the ip addresses of that instance, for instance:

output ip_address {
    value = ${aws_instance.myAWSInstance.*.private_ip}"
}

有没有办法在 router-init.sh 脚本中传递/访问这些 IP 地址?

Is there a way to pass / access these ip addresses within the router-init.sh script?

推荐答案

你可以使用 template_file 数据源:

You can do this using a template_file data source:

data "template_file" "init" {
  template = "${file("router-init.sh.tpl")}"

  vars = {
    some_address = "${aws_instance.some.private_ip}"
  }
}

然后在模板中引用它，如:

Then reference it inside the template like:

#!/bin/bash

echo "SOME_ADDRESS = ${some_address}" > /tmp/

然后将其用于 user_data:

 user_data = ${data.template_file.init.rendered}

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