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DependsOn Attribute
The DependsOn attribute enables you to specify that the creation of a specific
resource follows another. When you add a DependsOn attribute to a resource, you specify that that resource is
created only after the creation of the resource specified in the DependsOn attribute. When you use wait
conditions, you typically use the DependsOn attribute on another resource to determine when the wait condition
goes into effect. For more information, see Creating Wait Conditions in a Template. However, you can use the DependsOn attribute on any resource.
Syntax
"DependsOn" : StringExample
The following template contains an AWS::EC2::Instance resource with a DependsOn attribute that specifies myDB, an AWS::RDS::DBInstance. When AWS CloudFormation creates this stack, it first creates myDB, then creates Ec2Instance.
{
"AWSTemplateFormatVersion" : "2010-09-09",
"Mappings" : {
"RegionMap" : {
"us-east-1" : { "AMI" : "ami-76f0061f" },
"us-west-1" : { "AMI" : "ami-655a0a20" },
"eu-west-1" : { "AMI" : "ami-7fd4e10b" },
"ap-northeast-1" : { "AMI" : "ami-8e08a38f" },
"ap-southeast-1" : { "AMI" : "ami-72621c20" }
}
},
"Resources" : {
"Ec2Instance" : {
"Type" : "AWS::EC2::Instance",
"Properties" : {
"ImageId" : {
"Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]
}
},
"DependsOn" : "myDB"
},
"myDB" : {
"Type" : "AWS::RDS::DBInstance",
"Properties" : {
"AllocatedStorage" : "5",
"DBInstanceClass" : "db.m1.small",
"Engine" : "MySQL",
"EngineVersion" : "5.5",
"MasterUsername" : "MyName",
"MasterUserPassword" : "MyPassword"
}
}
}
} 
