如何在 AWS CloudFormation 中指定子网和 VPC ID? [英] How do I specify subnet and VPC IDs in AWS CloudFormation?

问题描述

我希望我的 CloudFormation 模板使用现有的子网和 VPC.我不想创建新的.

I want my CloudFormation template to use existing subnets and VPCs. I don't want to create new ones.

我如何参数化这些?

当我查看AWS::EC2::VPC 和AWS::EC2::Subnet 的文档时，似乎这些资源仅用于创建新 VPC 和子网.对吗?

When I look at the docs for AWS::EC2::VPC and AWS::EC2::Subnet, it seems these resources are only for creating new VPCs and subnets. Is that correct?

我是否应该直接将实例资源指向我希望它使用的现有 VPC 和子网?

Should I just point the instance resource directly to the existing VPC and subnets I want it to use?

例如 - 如果我的模板中有一个实例资源并且我将它直接指向现有子网，如下所示:

For example - if I have an instance resource in my template and I point it directly to an existing subnet, like this:

{
  "Resources": {
    "MyServer": {
      "Type": "AWS::EC2::Instance",
      "Properties": {
        "InstanceType": {
          "Ref": "InstanceType"
        },
"SubnetId": {
  "Ref": "subnet-abc123"
},
...

我在验证模板时收到此错误:

I get this error when validating the template:

Template contains errors.: Template format error: Unresolved resource dependencies [subnet-abc123] in the Resources block of the template

我尝试使用映射来执行此操作，但仍然出现错误:

I tried to do this with mappings but still getting an error:

  "Mappings": {
    "SubnetID": {
      "TopKey": {
        "Default": "subnet-abc123"
      }
    }

在实例资源中使用这个:

And with this in the instance resource:

"SubnetId": {
  "Fn::FindInMap": [
    "SubnetID",
    {
      "Ref": "TopKey"
    },
    "Default"
  ]
}

尝试验证时出现此错误:

I get this error when trying to validate:

Template contains errors.: Template format error: Unresolved resource dependencies [TopKey] in the Resources block of the template

推荐答案

如果您希望使用特定的 VPC 和子网，只需插入它们的值:

If you wish to use a specific VPC and subnet, just insert their values:

{
  "Resources": {
    "MyServer": {
      "Type": "AWS::EC2::Instance",
      "Properties": {
        "InstanceType": "t2.micro",
        "SubnetId": "subnet-abc123",
        "ImageId": "ami-abcd1234"
      }
    }
}

子网始终属于 VPC，因此指定子网将自动选择匹配的 VPC.

A subnet always belongs to a VPC, so specifying the subnet will automatically select the matching VPC.

这篇关于如何在 AWS CloudFormation 中指定子网和 VPC ID?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！