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layout	page_title	sidebar_current	description
aws	AWS: aws_launch_configuration	docs-aws-resource-launch-configuration	Provides a resource to create a new launch configuration, used for autoscaling groups.

aws_launch_configuration

Provides a resource to create a new launch configuration, used for autoscaling groups.

Example Usage

resource "aws_launch_configuration" "as_conf" {
    name = "web_config"
    image_id = "ami-1234"
    instance_type = "m1.small"
}

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. In order to effectively use a Launch Configuration resource with an AutoScaling Group resource, it's recommend to omit the Launch Configuration name attribute, and specify create_before_destroy in a lifecycle 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:

name - (Optional) The name of the launch configuration. If you leave this blank, Terraform will auto-generate it.
image_id - (Required) The EC2 image ID to launch.
instance_type - (Required) The size of instance to launch.
iam_instance_profile - (Optional) The IAM instance profile to associate with launched instances.
key_name - (Optional) The key name that should be used for the instance.
security_groups - (Optional) A list of associated security group IDS.
associate_public_ip_address - (Optional) Associate a public ip address with an instance in a VPC.
user_data - (Optional) The user data to provide when launching the instance.
enable_monitoring - (Optional) Enables/disables detailed monitoring. This is enabled by default.
ebs_optimized - (Optional) If true, the launched EC2 instance will be EBS-optimized.
block_device_mapping - (Optional) A list of block devices to add. Their keys are documented below.

Block devices

Each of the *_block_device attributes controls a portion of the AWS Launch Configuration's "Block Device Mapping". It's a good idea to familiarize yourself with AWS's Block Device Mapping docs to understand the implications of using these attributes.

The root_block_device mapping supports the following:

volume_type - (Optional) The type of volume. Can be "standard", "gp2", or "io1". (Default: "standard").
volume_size - (Optional) The size of the volume in gigabytes.
iops - (Optional) The amount of provisioned IOPS. This must be set with a volume_type of "io1".
delete_on_termination - (Optional) Whether the volume should be destroyed on instance termination (Default: true).

Modifying any of the root_block_device settings requires resource replacement.

Each ebs_block_device supports the following:

device_name - (Required) The name of the device to mount.
snapshot_id - (Optional) The Snapshot ID to mount.
volume_type - (Optional) The type of volume. Can be "standard", "gp2", or "io1". (Default: "standard").
volume_size - (Optional) The size of the volume in gigabytes.
iops - (Optional) The amount of provisioned IOPS. This must be set with a volume_type of "io1".
delete_on_termination - (Optional) Whether the volume should be destroyed on instance termination (Default: true).

Modifying any ebs_block_device currently requires resource replacement.

Each ephemeral_block_device supports the following:

device_name - The name of the block device to mount on the instance.
virtual_name - The Instance Store Device Name (e.g. "ephemeral0")

Each AWS Instance type has a different set of Instance Store block devices available for attachment. AWS publishes a list of which ephemeral devices are available on each type. The devices are always identified by the virtual_name in the format "ephemeral{0..N}".

~> NOTE: Changes to *_block_device configuration of existing resources cannot currently be detected by Terraform. After updating to block device configuration, resource recreation can be manually triggered by using the taint command.

Attributes Reference

The following attributes are exported:

id - The ID of the launch configuration.

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