Instantiate multiple EC2 instances using AWS Cloud Formation Template.

Question

Hi there,
I have a use-case, where I want to instantiate variable number of EC2 instances depending on the input provided by the user.
for ex: If user provided 3 as input then 3 Ec2 instances should be instantiated and so on.

Please guide me here, I am stuck with this for few days now.

thanks in advance!

Answer

You can try this way, but I think there is more elegant solution:

```
AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::LanguageExtensions

Parameters:
    InstanceList:
        Type: CommaDelimitedList

Resources:
  Fn::ForEach::Instances:
    - InstanceLogicalId
    - !Ref InstanceList
    - ${InstanceLogicalId}:
        Type: AWS::EC2::Instance
        Properties:
          ImageId: ami-0ed752ea0f62749af
          InstanceType: t2.micro
```

Then in a console just type the name of logical id, like:

```
 instance1 - will create one instance
 instance1, instance2, instance3 - will create three instances
```

Answer

You can also do this with Count -macro. There were some issues using parameters with Count attribute but based on comments those shound have been fixed.

* https://github.com/aws-cloudformation/aws-cloudformation-macros/tree/master/Count
* https://github.com/aws-cloudformation/aws-cloudformation-macros/issues/14

Instantiate multiple EC2 instances using AWS Cloud Formation Template.

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