You want to create an EC2 instance and assign it a security group defined in the same Resources section. How do you reference the security group in the EC2 instance properties?

hard📝 Application Q9 of 15

AWS - CloudFormation

You want to create an EC2 instance and assign it a security group defined in the same Resources section. How do you reference the security group in the EC2 instance properties?

A"SecurityGroupIds": [{ "Ref": "MySecurityGroup" }]

B"SecurityGroups": "MySecurityGroup"

C"SecurityGroupIds": "MySecurityGroup"

D"SecurityGroups": [{ "Ref": "MySecurityGroup" }]

Step-by-Step Solution

Solution:

Step 1: Identify correct property for EC2 security groups
For VPC instances, SecurityGroupIds expects a list of security group IDs referenced by Ref.
Step 2: Confirm correct syntax for referencing resource
Use Ref function inside a list for SecurityGroupIds; SecurityGroups property is for EC2-Classic.
Final Answer:
"SecurityGroupIds": [{ "Ref": "MySecurityGroup" }] -> Option A
Quick Check:
Use SecurityGroupIds with Ref list for VPC security groups [OK]

Quick Trick: Use SecurityGroupIds with Ref array to link security groups [OK]

Common Mistakes:

Using SecurityGroups property in VPC context
Passing string instead of list for SecurityGroupIds
Not using Ref to reference resource

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You want to create an EC2 instance and assign it a security group defined in the same Resources section. How do you reference the security group in the EC2 instance properties?

Step 1: Identify correct property for EC2 security groups

Step 2: Confirm correct syntax for referencing resource

Final Answer:

Quick Check:

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