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providers/aws: Update Launch Config. docs to detail naming and lifecycle recommendation

This commit is contained in:
Clint Shryock 2015-08-12 11:00:05 -05:00
parent a1507c85f2
commit d7c3221b02
2 changed files with 36 additions and 5 deletions
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@ -180,6 +180,3 @@ PLATFORMS
DEPENDENCIES
middleman-hashicorp!
BUNDLED WITH
1.10.5

38
website/source/docs/providers/aws/r/launch_configuration.html.markdown
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@ -10,8 +10,6 @@ description: |-
Provides a resource to create a new launch configuration, used for autoscaling groups.
~> **NOTE:** You may want to omit `name` attribute from attached `aws_launch_configuration`. When you [create](http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/LaunchConfiguration.html) a launch configuration, you cannot edit it. Terraform will treat a change in this resource as a destroy and create action. If you add a name to your launch configuration, then terraform will not be able to create the replacement launch configuration due to the name being the same.
## Example Usage
```
@ -22,6 +20,39 @@ resource "aws_launch_configuration" "as_conf" {
}
```
## Using with AutoScaling Groups
Launch Configurations cannot be updated after creation with the Amazon
Web Service API. In order to update a Launch Configuration, Terraform will
destroy the existing resource and create a replacement. If order to effectively
use a Launch Configuration resource with an[AutoScaling Group resource][1],
it's recommend to omit the Launch Configuration `name` attribute, and
specify `create_before_destroy` in a [lifecycle][2] block, as shown:
```
resource "aws_launch_configuration" "as_conf" {
image_id = "ami-1234"
instance_type = "m1.small"
lifecycle {
create_before_destroy = true
}
}
resource "aws_autoscaling_group" "bar" {
name = "terraform-asg-example"
launch_configuration = "${aws_launch_configuration.as_conf.name}"
lifecycle {
create_before_destroy = true
}
}
```
With this setup Terraform generates a unique name for your Launch
Configuration and can then update the AutoScaling Group without conflict before
destroying the previous Launch Configuration.
## Argument Reference
The following arguments are supported:
@ -100,3 +131,6 @@ configuration, resource recreation can be manually triggered by using the
The following attributes are exported:
* `id` - The ID of the launch configuration.
[1]: /docs/providers/aws/r/autoscaling_group.html
[2]: /docs/configuration/resources.html#lifecycle