如何指示 AWS CloudFormation 模板在特定区域创建资源？

Question

I am new to CloudFormation templates. I have basic template in yaml that creates an EC2 Instance. Every time I create a stack and use this template, the EC2 Instance is ALWAYS created on US East N. Virginia region. I am trying to change this so that the EC2 Instance resides in US-WEST-2 region. After some research, it appears that this is something that is not specified within the template. Instead, I need to change the region to us-west-2 in AWS console and then create a new stack. Is my understanding correct?

Answer 1

Unfortunately, you can't specify the region in a cloudformation template.

You should either pass region as a command line argument

aws --region eu-west-1 cloudformation create-stack --stack-name ...

or, specify the default region in aws cli config file ~/.aws/config

[default]
region=eu-west-1

Answer 2

What am I missing here? I am sure we can specify region where the stack is created in CFN template using parameters and we do have active templates which creates our stack in respective region based on the parameter value. The AWS::Region pseudo parameter is a value that AWS CloudFormation resolves as the region where the stack is created. https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/gettingstarted.templatebasics.html

Here is a sub-section of sample template

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "InstanceType": {
      "Description": "Instance Type",
      "Type": "String",
      "Default": "t2.xlarge"
    },
    "SubnetUSEAST1": {
      "Description": "Subnet on which Ec2 instance needs to be created",
      "Type": "String",
      "Default": "subnet-xxxxxxxx"
    },
    "SubnetUSWEST2": {
      "Description": "Subnet on which Ec2 instance needs to be created",
      "Type": "String",
      "Default": "subnet-yyyyyyyy"
    }
  },
  "Conditions": {
    "useast1": {
      "Fn::Equals": [
        {
          "Ref": "AWS::Region"
        },
        "us-east-1"
      ]
    },
    "uswest2": {
      "Fn::Equals": [
        {
          "Ref": "AWS::Region"
        },
        "us-west-2"
      ]
    }
  },
  "Resources": {
    "EC2Instance": {
      "Type": "AWS::EC2::Instance",
      "Properties": {
        "InstanceType": {
          "Ref": "InstanceType"
        },
        "NetworkInterfaces": [
          {
            "SubnetId": {
              "Fn::If": [
                "useast1",
                {
                  "Ref": "SubnetUSEAST1"
                },
                {
                  "Ref": "SubnetUSWEST2"
                }
              ]
            },
            "AssociatePublicIpAddress": "false",
            "DeviceIndex": "0"
          }
        ]
      }
    }
  }
}

Answer 3

如果您能够将模板拆分为多个部分，则可以通过一些编排和StackSets一次部署到不同的区域。