Detach instance(s) from ALB Target Group

[Adam Daughterson]

Hello,

I'm working on providing the capability to attach and detach EC2 from an ALB Target Group.
I've found the documentation for aws_lb_target_group_attachment, but can find nothing for detachment.
Is this even possible with Terraform? Is the expectation that I should create a brand new load-balancer/target-group/listeners/etc each time I perform terraform apply?

Any help is greatly appreciated,

Adam D

[Clint Shryock]

Hey Adam –

You can create a LB Target group, and an EC2 Instance, and then attach them with aws_lb_target_group_attachment as you mention. Put those three in a configuration file then `terraform plan` and `terraform apply`. 

For detach, remove aws_lb_target_group_attachment from the configuration (or perhaps change which instance is in the attachment). Run `terraform plan` to verify the plan to detach that instance, then `terraform apply` to complete it. 

Please let me know if thats not what you're looking for. 

Cheers,

Clint

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[David Adams]

You could also do this with a variable (or something calculated from a variable or resource attribute or module output) which triggers `count=0` on the aws_lb_target_group_attachment resource. Then an apply would destroy the attachment without necessarily needing to edit the TF code.

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