AWS：Cloud Formation：是不是可以使用多个“DependsOn”？

Posted 2023-03-04

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【中文标题】AWS：Cloud Formation：是不是可以使用多个“DependsOn”？【英文标题】：AWS: Cloud Formation: Is it possible to use multiple "DependsOn"?AWS：Cloud Formation：是否可以使用多个“DependsOn”？ 【发布时间】：2014-03-26 00:16:17 【问题描述】：

鉴于我有这个示例模板：


    "AWSTemplateFormatVersion" : "2010-09-09",
    "Mappings" : 
        "RegionMap" : 
            "us-west-1" :  "AMI" : "ami-655a0a20" ,
            ...
        
    ,
    "Resources" : 
        "Ec2Instance" : 
            "Type" : "AWS::EC2::Instance",
            "Properties" : 
                ...
            ,
            "DependsOn" : "myDB"
        ,
        "myDB" : 
            "Type" : "AWS::RDS::DBInstance",
            "Properties" : 
               ...
            
        ,
        "myDB2" : 
            "Type" : "AWS::RDS::DBInstance",
            "Properties" : 
               ...

是否可以以任何方式指定多个 DependsOn？有这样的想法会很棒：

"DependsOn" : ["myDB", "myDB2"]

正常的方式是什么？

【问题讨论】：

【参考方案1】：

这个答案首先出现在 Google 中，所以我将介绍如何在 YAML 中执行多个依赖属性，我在 this answer 中找到了这些属性。

AnotherProductionResource:
  Type: AWS::CloudFormation::Stack
   Condition: ISProduction
   DependsOn:
   - AResource
   - MyProductionResource
   Properties:
     [...]

【讨论】：

【参考方案2】：


    "Description": "Create a variable number of EC2 instance resources.",
    "Parameters": 
        "InstanceCount": 
            "Description": "Number of EC2 instances (must be between 1 and 5).",
            "Type": "Number",
            "Default": 1,
            "MinValue": 1,
            "MaxValue": 5,
            "ConstraintDescription": "Must be a number between 1 and 5."
        ,
        "ImageId": 
            "Description": "Image ID to launch EC2 instances.",
            "Type": "AWS::EC2::Image::Id",
            "Default": "ami-31c9924e"
        ,
        "InstanceType": 
            "Description": "Instance type to launch EC2 instances.",
            "Type": "String",
            "Default": "m3.medium",
            "AllowedValues": [
                "m3.medium",
                "m3.large",
                "m3.xlarge",
                "m3.2xlarge"
            ]
        
    ,
    "Conditions": 
        "Launch1" : "Fn::Equals" : ["Ref" : "InstanceCount", "1"],
        "Launch2" : "Fn::Equals" : ["Ref" : "InstanceCount", "2"]       
    ,
    "Resources": 
        "Instance2": 
            "Condition": "Launch2",
            "Type": "AWS::EC2::Instance",
            "Properties": 
                "ImageId": 
                    "Ref": "ImageId"
                ,
                "InstanceType": 
                    "Ref": "InstanceType"
                
            ,
            "DependsOn": "Instance1"
        ,
        "Instance1": 
            "Condition": "Launch1",
            "Type": "AWS::EC2::Instance",
            "Properties": 
                "ImageId": 
                    "Ref": "ImageId"
                ,
                "InstanceType": 
                    "Ref": "InstanceType"

【讨论】：

【参考方案3】：

是的， “DependsOn”可以采用多个字符串。我在下面列出了一个示例：

“DependsOn”：[“S3BucketAppElbLogs”，“ElbLogAppBucketPolicy”]

【讨论】：

【参考方案4】：

是的，