CloudFormation cfn-init 信号 userdata 脚本的成功/失败

Question

我编写了一个 powershell EC2 用户数据脚本。我想知道如何使用 cfn-init.exe 向 CloudFormation 发送成功/失败信号？请提供示例和语法，因为我是 CloudFormation 的新手。

Answer 1

您需要使用 cfn-signal 命令将信号传递给 cloudformation。 请查看http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-signal.html的文档

我添加了 cloudformation sn-p，它使用 cfn-signal 传递信号。

脚本确保 cloudformation 在实例上等待最多 300 秒才能创建，然后再向 cloudformation 发出失败信号。

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Resources": {
    "EC2Instance": {
      "Type": "AWS::EC2::Instance",
      "Properties": {
        "ImageId": "<AMI>",
        "InstanceType": "<Instance Type>",
        "KeyName": "<Key_pair>",
        "Monitoring": "false",
        "UserData": {
          "Fn::Base64": {
            "Fn::Join": [
              "",
              [
                "#!/bin/bash -e\n",
                "yum update -y aws-cfn-bootstrap\n",
                "/opt/aws/bin/cfn-signal -e 0 -r \"Failed to create Instance\" ",
                {
                  "Ref": "WaitHandle"
                },
                "'\n"
              ]
            ]
          }
        }
      }
    },
    "WaitHandle": {
      "Type": "AWS::CloudFormation::WaitConditionHandle"
    },
    "WaitCondition": {
      "Type": "AWS::CloudFormation::WaitCondition",
      "DependsOn": "EC2Instance",
      "Properties": {
        "Handle": {
          "Ref": "WaitHandle"
        },
        "Timeout": "300"
      }
    }
  }
}