how to tag an existing autoscaling group using boto3

Question

I'm trying to tag an existing autoscaling group, using Python and Boto3.

I can definitely describe the ASGs by name:

```
import boto3
asg_client = boto3.client("autoscaling")
asg_name = "foo-bar20220502044025104700000001"
response = asg_client.describe_auto_scaling_groups(AutoScalingGroupNames=[asg_name])
```

The problem I have with the `create_or_update_tags()` and `delete_tags()` methods is that they don't seem to accept a list of ASG names. E.g. this doesn't work:

```
asg_client.create_or_update_tags(
	AutoScalingGroupNames=[asg_name],
	Tags=[my_tag]
)
```

To make it clear:

- the ASG already exists, I am not creating it here
- I do not want to make any other changes to the ASG
- all I want is be able to tag an ASG if I know its name
- I need to use boto3 from Python for this

The tag-related methods appear to be different from all the other ASG client methods in that they do not accept an ASG name, or list of names, as a parameter.

weidi · Accepted Answer

Thank you for the detailed description.

The ASG name should be specified as `ResourceId` in the `Tags`:

```
response = client.create_or_update_tags(
    Tags=[
        {
            'Key': 'Role',
            'PropagateAtLaunch': True,
            'ResourceId': 'my-auto-scaling-group',
            'ResourceType': 'auto-scaling-group',
            'Value': 'WebServer',
        }
    ],
)

print(response)
```

Refer to https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/autoscaling.html#AutoScaling.Client.create_or_update_tags for more information.

how to tag an existing autoscaling group using boto3

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