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main.tf
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/**
* AWS Instance
* ============
* This is an module to creates a DC/OS AWS Instance.
*
* If `ami` variable is not set. This module uses the mesosphere suggested OS
* which also includes all prerequisites.
*
* Using you own AMI
* -----------------
* If you choose to use your own AMI please make sure the DC/OS related
* prerequisites are met. Take a look at https://docs.mesosphere.com/1.11/installing/ent/custom/system-requirements/install-docker-RHEL/
*
* EXAMPLE
* -------
*
*```hcl
* module "dcos-master-instance" {
* source = "terraform-dcos/instance/aws"
* version = "~> 0.1.0"
*
* cluster_name = "production"
* subnet_ids = ["subnet-12345678"]
* security_group_ids = ["sg-12345678"]
* hostname_format = "%[3]s-master%[1]d-%[2]s"
* ami = "ami-12345678"
*
* extra_volumes = [
* {
* size = "100"
* type = "gp2"
* iops = "3000"
* device_name = "/dev/xvdi"
* },
* {
* size = "1000"
* type = "" # Use AWS default.
* iops = "0" # Use AWS default.
* device_name = "/dev/xvdj"
* }
* ]
* }
*```
*/
provider "aws" {}
locals {
# NOTE: This is to workaround the divide by zero warning from Terraform.
num_extra_volumes = "${length(var.extra_volumes) > 0 ? length(var.extra_volumes) : 1}"
# NOTE: This is to make "lookup" happy. Otherwise, it will complain
# about the type cannot be derived if "var.extra_volumes" is not
# set.
extra_volumes = "${concat(var.extra_volumes, list(map("dummy", "dummy")))}"
}
module "dcos-tested-oses" {
source = "dcos-terraform/tested-oses/aws"
version = "~> 0.1.0"
providers = {
aws = "aws"
}
os = "${var.dcos_instance_os}"
}
resource "aws_instance" "instance" {
instance_type = "${var.instance_type}"
ami = "${coalesce(var.ami, module.dcos-tested-oses.aws_ami)}"
count = "${var.num}"
key_name = "${var.key_name}"
vpc_security_group_ids = ["${var.security_group_ids}"]
associate_public_ip_address = "${var.associate_public_ip_address}"
iam_instance_profile = "${var.iam_instance_profile}"
# availability_zone = "${element(var.availability_zones, count.index % length(var.availability_zones)}"
subnet_id = "${element(var.subnet_ids, count.index % length(var.subnet_ids))}"
tags = "${merge(var.tags, map("Name", format(var.hostname_format, (count.index + 1), var.region, var.cluster_name),
"Cluster", var.cluster_name,
"KubernetesCluster", var.cluster_name))}"
root_block_device {
volume_size = "${var.root_volume_size}"
volume_type = "${var.root_volume_type}"
delete_on_termination = true
}
user_data = "${var.user_data}"
lifecycle {
ignore_changes = ["user_data", "ami"]
}
}
resource "aws_ebs_volume" "volume" {
# We group volumes from one instance first. For instance:
# - length(var.extra_volumes) = 2 (volumes)
# - var.num = 3 (instances)
#
# We will get:
# - volume.0 (instance 0)
# - volume.1 (instance 0)
# - volume.2 (instance 1)
# - volume.3 (instance 1)
# - volume.4 (instance 2)
# - volume.5 (instance 2)
count = "${var.num * length(var.extra_volumes)}"
availability_zone = "${element(aws_instance.instance.*.availability_zone, count.index / local.num_extra_volumes)}"
size = "${lookup(local.extra_volumes[count.index % local.num_extra_volumes], "size", "120")}"
type = "${lookup(local.extra_volumes[count.index % local.num_extra_volumes], "type", "")}"
iops = "${lookup(local.extra_volumes[count.index % local.num_extra_volumes], "iops", "0")}"
tags = "${merge(var.tags, map(
"Name", format(var.extra_volume_name_format,
var.cluster_name,
element(aws_instance.instance.*.id, count.index / local.num_extra_volumes)),
"Cluster", var.cluster_name))}"
}
resource "aws_volume_attachment" "volume-attachment" {
count = "${var.num * length(var.extra_volumes)}"
device_name = "${lookup(local.extra_volumes[count.index % local.num_extra_volumes], "device_name", "dummy")}"
volume_id = "${element(aws_ebs_volume.volume.*.id, count.index)}"
instance_id = "${element(aws_instance.instance.*.id, count.index / local.num_extra_volumes)}"
force_detach = true
}
resource "null_resource" "instance-prereq" {
// if the user supplies an AMI or user_data we expect the prerequisites are met.
count = "${coalesce(var.ami, var.user_data) == "" ? var.num : 0}"
connection {
host = "${var.associate_public_ip_address ? element(aws_instance.instance.*.public_ip, count.index) : element(aws_instance.instance.*.private_ip, count.index)}"
user = "${module.dcos-tested-oses.user}"
}
provisioner "file" {
content = "${module.dcos-tested-oses.os-setup}"
destination = "/tmp/dcos-prereqs.sh"
}
provisioner "remote-exec" {
inline = [
"chmod +x /tmp/dcos-prereqs.sh",
"sudo bash -x /tmp/dcos-prereqs.sh",
]
}
depends_on = ["aws_instance.instance"]
}