Cannot delete launch configuration because it is attached to AutoScalingGroup

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Igor Cicimov

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Jan 7, 2016, 8:05:26 PM1/7/16

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Hi,

I get the following error when trying to update existing launch configuration:

* aws_launch_configuration.app: ResourceInUse: Cannot delete launch configuration app-lc because it is attached to AutoScalingGroup app-asg

It doesn't seem like anything TF should not be able to resolve, obviously the ASG needs to be re-created as well. Why is this happening?

Thanks,
Igor

Clint Shryock

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Jan 8, 2016, 10:01:22 AM1/8/16

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Hello –

Sorry for the trouble you're hitting here. Terraform constructs a graph of dependencies to determine what needs to be recreated, typically based on the interpolations in the configuration file. In the case of Launch Configurations and Autoscaling groups, the LC is bound to the ASG by the LC’s name. If you’re specifying the LC’s name in your configuration (instead of letting Terraform auto generate a random one), then from the ASG’s view there is no change needed.

The strategy to avoid this is to omit the name attribute (and optionally use the name_prefix attribute) in the configuration, and add the “create_before_destroy” flag, via the “lifecycle” block. This instructs Terraform to create a new Launch configuration (with a new random name) and to update the AutoScaling Group with this new name before attempting to destroy the original Launch Configuration.

You can see this documented and an example here:

- https://terraform.io/docs/providers/aws/r/launch_configuration.html

We realize it’s more hassle than it should be, but without a way to update Launch Configurations via the API it’s currently the best solution.

Hopes this helps!

Regards,

Clint

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