AWS Autoscaling Group & Launch Configuration ordering error

[johnrengelman]

I've been running into problems making changes to an AWS Launch Configuration.
Very similar to #532 and according to 09f5935 I should set create_before_destroy = true.

Setting that lifecycle value allows changes to the Launch Configuration to work, but it prevents setting up a new environment from a clean slate. Since there isn't an existing Launch Configuration, Terraform seems to end up in a cycle dependency.

[phinze]

We're working on making improvements around the cycle detection error messaging, so this is definitely a confusing state to be in right now. But the fact is that you can introduce legitimate cycles when you add create_before_destroy to a resource that has non-CBD dependencies.

If you add CBD to the chain of resources depended on by your launch configuration, does that sort the cycle for you?

[johnrengelman]

I had tried that, but it didn't seem to help at the time. Not at a point where I can go back and try it again either.

[phinze]

Setting that lifecycle value allows changes to the Launch Configuration to work, but it prevents setting up a new environment from a clean slate. Since there isn't an existing Launch Configuration, Terraform seems to end up in a cycle dependency.

@johnrengelman having trouble coming up with a repro case here, do you think you might be able to give an example of the configs you're working with when you encounter this problem?

[johnrengelman]

The sample here: #1637 (comment) is what was doing it for me.

Having the create_before_destroy only worked if the LC was already existing. When it was deleted, I couldn't create a brand new one.

[mitchellh]

I'm going to say this is fixed or a dup of #1109 depending on what it is describing? If not, please let me know.

[ghost]

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