Step 5: Add a template constraint to limit instance size - Amazon Service Catalog
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Step 5: Add a template constraint to limit instance size

Constraints add another layer of control over products at the portfolio level. Constraints can control the launch context of a product (launch constraints), or add rules to the Amazon CloudFormation template (template constraints). For more information, see Using Amazon Service Catalog Constraints.

Add a template constraint to the Linux Desktop product that prevents users from selecting large instance types at launch time. The development-environment template allows the user to select from six instance types; this constraint limits valid instance types to the two smallest types, t2.micro and t2.small. For more information, see T2 Instances in the Amazon EC2 User Guide.

To add a template constraint to the Linux Desktop product

  1. On the Portfolio details page, choose Constraints, then choose Create constraint.

  2. In the Create constraint page, for Product, choose Linux Desktop. Then, for Constraint type, choose Template.

  3. In the Template constraint section, choose Text editor.

  4. Paste the following into the text editor:

    {
  "Rules": {
    "Rule1": {
      "Assertions": [
        {
          "Assert" : {"Fn::Contains": [["t2.micro", "t2.small"], {"Ref": "InstanceType"}]},
          "AssertDescription": "Instance type should be t2.micro or t2.small"
        }
      ]
    }
  }
}

  5. For Constraint description, enter Small instance sizes.

  6. Choose Create.