Question

给出一对使用

部署的aws实例

provider "aws" {
  region     = "us-east-1"
}

resource "aws_instance" "example" {
  count         = 2
  ami           = "ami-2757f631"
  instance_type = "t2.micro"
  tags = {
      Name = "Test${count.index}"
  }
}

降低count = 1会破坏最后部署的实例：

Terraform will perform the following actions:

    - aws_instance.example[1]

是否有可能让terraform破坏 第一个实例 。即

Terraform will perform the following actions:

  - aws_instance.example[0]

Answer 1

Terraform正在跟踪哪个实例通过其状态。当您减少count资源上的aws_instance时，Terraform将只删除后面的实例。虽然这不应该是一个很大的问题，因为我只是真的建议您部署一组可以处理负载被中断的同质实例（如果你真的需要的话，它会处于某种形式的负载平衡器机制之后）可以编辑状态文件以在减少实例数量之前重新排序实例。

状态文件被序列化为JSON，因此您可以直接编辑它（确保它上传到您用于远程状态的任何内容，如果您使用的是远程状态）或者更好的是您可以使用第一类工具进行编辑Terraform CLI提供的远程状态terraform state mv。

举个例子，你可以这样做：

# Example from question has been applied already
# `count` is edited from 2 to 1
$ terraform plan
...
aws_instance.example[1]: Refreshing state... (ID: i-0c227dfbfc72fb0cd)
aws_instance.example: Refreshing state... (ID: i-095fd3fdf86ce8254)

------------------------------------------------------------------------

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  - destroy

Terraform will perform the following actions:

  - aws_instance.example[1]

Plan: 0 to add, 0 to change, 1 to destroy.
...
$
$
$
$ terraform state list
aws_instance.example[0]
aws_instance.example[1]
$
$
$
$ terraform state mv aws_instance.example[1] aws_instance.example[2]
Moved aws_instance.example[1] to aws_instance.example[2]
$ terraform state mv aws_instance.example[0] aws_instance.example[1]
Moved aws_instance.example[0] to aws_instance.example[1]
$ terraform state mv aws_instance.example[2] aws_instance.example[0]
Moved aws_instance.example[2] to aws_instance.example[0]
$
$
$
$ terraform plan
...
aws_instance.example[1]: Refreshing state... (ID: i-095fd3fdf86ce8254)
aws_instance.example: Refreshing state... (ID: i-0c227dfbfc72fb0cd)

------------------------------------------------------------------------

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  ~ update in-place
  - destroy

Terraform will perform the following actions:

  ~ aws_instance.example
      tags.Name: "Test1" => "Test0"

  - aws_instance.example[1]

Plan: 0 to add, 1 to change, 1 to destroy.
...

terraform：如何在降低aws_instance计数时销毁最旧的实例

1 个答案: