terraform:根据资源计数创建列表 [英] terraform: create list based on resource count

问题描述

我们有一堆实例(我知道......牛，不是宠物，但在这种情况下，这些真的是宠物)

We have a bunch of instances (I know... cattle, not pets, but in this case, these are really pets)

resource "aws_instance" "read_00" {
  count = "${var.read_00_count}"

resource "aws_instance" "read_01" {
  count = "${var.read_01_count}"

我们有一个 ELB，我们希望根据它们的计数变量动态添加实例，如下所示:

And we have an ELB where we want to dynamically add the instances based on their count variable, like so:

resource "aws_elb" "read_slaves" {
  instances = ["${aws_instance.read_.*.id}"]

但这当然行不通.

只有当它们的计数不为零时，是否可以动态创建实例 ID 列表?

Is it possible to dynamically create a list of instance ids ONLY if their count is not zero?

我知道这有悖常理，但如果这是可能的，那就太棒了.

I know this goes against the grain, but if this is possible, that would be awesome.

推荐答案

使用 Terraform 0.12 会容易得多，但现在这样的事情会做:

With Terraform 0.12 that will be much easier, but for now something like this would do:

[...]
resource "aws_instance" "read_01" {
  [...]
  count = "${var.read_01_count}"
  tags {
    Role = "read_slave"
  }
}

data "aws_instances" "read-slaves" {
  instance_tags {
    Role = "read_slave"
  }
  // optional filters
}

resource "aws_elb" "read_slaves" {
  instances = ["${data.aws_instances.read-slaves.ids}"]

  listener {
    ...
  }
}

因此:

• 标记每个充当读取从属设备的实例
• 收集 aws_intances
列表
• 根据收集的数据创建 aws_elb

这篇关于terraform:根据资源计数创建列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！