Explanation:
DependsOn forces CloudFormation to wait until the specified resource (MyDB) is created before starting creation of the dependent resource (AppServer).
Ultimate access to all questions.
What is the purpose of the DependsOn attribute in the template below?
Resources:
MyDB:
Type: AWS::RDS::DBInstance
Properties:
DBInstanceClass: db.t3.micro
Engine: mysql
MasterUsername: admin
MasterUserPassword: !Ref DBPassword
AppServer:
Type: AWS::EC2::Instance
DependsOn: MyDB
Properties:
ImageId: ami-0abcdef1234567890
InstanceType: t3.small
Resources:
MyDB:
Type: AWS::RDS::DBInstance
Properties:
DBInstanceClass: db.t3.micro
Engine: mysql
MasterUsername: admin
MasterUserPassword: !Ref DBPassword
AppServer:
Type: AWS::EC2::Instance
DependsOn: MyDB
Properties:
ImageId: ami-0abcdef1234567890
InstanceType: t3.small
A
AppServer will be deleted before MyDB during stack deletion
B
AppServer will not be created until MyDB is successfully created
C
AppServer and MyDB will be created in parallel
D
AppServer will inherit the security group from MyDB
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