Invalid template resource property "Tags"

Question

For the below cloudformation template:

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Some Stack",
    "Parameters":{
        "VpcId":{
            "Type": "AWS::EC2::VPC::Id",
            "Description": "The target VPC Id"
        },
        "SubnetId":{
            "Type": "AWS::EC2::Subnet::Id",
            "Description": "The target subnet Id"
        },
        "KeyName": {
            "Type": "String",
            "Description": "The key pair that is allowed SSH access"
        }
    },
    "Resources":{
        "EcsCluster":{
            "Type": "AWS::ECS::Cluster",
            "Tags": [ 
                        {
                            "Key": "Name",
                            "Value": { "Fn::Join": ["", [ { "Ref": "AWS::StackName" }, "-ecs-cluster" ] ] }     
                        },
                        {
                            "Key": "workenv",
                            "Value": "dev"
                        },
                        {
                            "Key": "abc",
                            "Value": "some_value"
                        },
                        {
                            "Key": "function",
                            "Value": "someapp"
                        },
                        {
                            "Key": "owner",
                            "Value": "email@abc.com"
                        }
            ]
        }
    },
    "Outputs":{
        "ElbDomainName":{
            "Description": "Public DNS name of Elastic Load Balancer",
            "Value": {
                "Fn::GetAtt": [
                    "ElasticLoadBalancer",
                    "DNSName"
                ]
            }
        }
    }
}

---

Below is the error:

   Invalid template resource property 'Tags'

Am following the below documentation to add tags:

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-resource-tags.html

---

Why CloudFormation service does not accept Tags defined on every resource? something to do with indentation?

Answer 1

It is because the Tags are not defined correctly for EcsCluster resource. The Tags property should be defined inside the Properties section as how you defined Tags for other resources.

"EcsCluster": {
  "Type": "AWS::ECS::Cluster",
  "Properties": {
    "Tags": []
  }
}

Hope this helps.

Answer 2

Not all resource types support tags. Check the documentation for each resource type.