adds mixed instance policy configuration (#19)

* adds mixed instance policy configuration * updates README, formats terraform * Updated README.md * Executed 'terraform fmt' Co-authored-by: actions-bot <[email protected]>
cloudposse · Feb 13, 2020 · e3a99fe · e3a99fe
1 parent 4f09e4d
commit e3a99fe
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Showing 5 changed files with 161 additions and 5 deletions.
diff --git a/examples/complete/fixtures-mixed-instance-policy.us-east-2.tfvars b/examples/complete/fixtures-mixed-instance-policy.us-east-2.tfvars
@@ -0,0 +1,36 @@
+region = "us-east-2"
+
+availability_zones = ["us-east-2a", "us-east-2b"]
+
+namespace = "eg"
+
+stage = "test"
+
+name = "ec2-autoscale-group"
+
+image_id = "ami-00c03f7f7f2ec15c3"
+
+instance_type = "t2.small"
+
+health_check_type = "EC2"
+
+wait_for_capacity_timeout = "10m"
+
+max_size = 3
+
+min_size = 2
+
+cpu_utilization_high_threshold_percent = 80
+
+cpu_utilization_low_threshold_percent = 20
+
+mixed_instances_policy = {
+  instances_distribution = null
+  override = [{
+    instance_type     = "t3.small"
+    weighted_capacity = null
+    }, {
+    instance_type     = "t3a.small"
+    weighted_capacity = null
+  }]
+}
diff --git a/examples/complete/main.tf b/examples/complete/main.tf
@@ -11,7 +11,7 @@ module "vpc" {
 }
 
 module "subnets" {
-  source               = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=tags/0.16.0"
+  source               = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=tags/0.18.1"
   availability_zones   = var.availability_zones
   namespace            = var.namespace
   stage                = var.stage
@@ -32,6 +32,8 @@ module "autoscale_group" {
 
   image_id                    = var.image_id
   instance_type               = var.instance_type
+  instance_market_options     = var.instance_market_options
+  mixed_instances_policy      = var.mixed_instances_policy
   subnet_ids                  = module.subnets.public_subnet_ids
   health_check_type           = var.health_check_type
   min_size                    = var.min_size

diff --git a/examples/complete/variables.tf b/examples/complete/variables.tf
@@ -62,3 +62,40 @@ variable "cpu_utilization_low_threshold_percent" {
   type        = number
   description = "CPU utilization low threshold"
 }
+
+variable "instance_market_options" {
+  description = "The market (purchasing) option for the instances"
+
+  type = object({
+    market_type = string
+    spot_options = object({
+      block_duration_minutes         = number
+      instance_interruption_behavior = string
+      max_price                      = number
+      spot_instance_type             = string
+      valid_until                    = string
+    })
+  })
+
+  default = null
+}
+
+variable mixed_instances_policy {
+  description = "policy to used mixed group of on demand/spot of differing types. Launch template is automatically generated. https://www.terraform.io/docs/providers/aws/r/autoscaling_group.html#mixed_instances_policy-1"
+
+  type = object({
+    instances_distribution = object({
+      on_demand_allocation_strategy            = string
+      on_demand_base_capacity                  = number
+      on_demand_percentage_above_base_capacity = number
+      spot_allocation_strategy                 = string
+      spot_instance_pools                      = number
+      spot_max_price                           = string
+    })
+    override = list(object({
+      instance_type     = string
+      weighted_capacity = number
+    }))
+  })
+  default = null
+}
diff --git a/main.tf b/main.tf
@@ -62,7 +62,8 @@ resource "aws_launch_template" "default" {
       market_type = lookup(instance_market_options.value, "market_type", null)
 
       dynamic "spot_options" {
-        for_each = flatten(list(lookup(instance_market_options.value, "spot_options", [])))
+        for_each = (instance_market_options.value.spot_options != null ?
+        [instance_market_options.value.spot_options] : [])
         content {
           block_duration_minutes         = lookup(spot_options.value, "block_duration_minutes", null)
           instance_interruption_behavior = lookup(spot_options.value, "instance_interruption_behavior", null)
@@ -124,6 +125,22 @@ resource "aws_launch_template" "default" {
   }
 }
 
+locals {
+  launch_template_block = {
+    id      = join("", aws_launch_template.default.*.id)
+    version = var.launch_template_version != "" ? var.launch_template_version : join("", aws_launch_template.default.*.latest_version)
+  }
+  launch_template = (
+    var.mixed_instances_policy == null ? local.launch_template_block
+  : null)
+  mixed_instances_policy = (
+    var.mixed_instances_policy == null ? null : {
+      instances_distribution = var.mixed_instances_policy.instances_distribution
+      launch_template        = local.launch_template_block
+      override               = var.mixed_instances_policy.override
+  })
+}
+
 resource "aws_autoscaling_group" "default" {
   count = var.enabled ? 1 : 0
 
@@ -148,9 +165,53 @@ resource "aws_autoscaling_group" "default" {
   protect_from_scale_in     = var.protect_from_scale_in
   service_linked_role_arn   = var.service_linked_role_arn
 
-  launch_template {
-    id      = join("", aws_launch_template.default.*.id)
-    version = var.launch_template_version != "" ? var.launch_template_version : join("", aws_launch_template.default.*.latest_version)
+  dynamic "launch_template" {
+    for_each = (local.launch_template != null ?
+    [local.launch_template] : [])
+    content {
+      id      = local.launch_template_block.id
+      version = local.launch_template_block.version
+    }
+  }
+
+  dynamic "mixed_instances_policy" {
+    for_each = (local.mixed_instances_policy != null ?
+    [local.mixed_instances_policy] : [])
+    content {
+      dynamic "instances_distribution" {
+        for_each = (
+          mixed_instances_policy.value.instances_distribution != null ?
+        [mixed_instances_policy.value.instances_distribution] : [])
+        content {
+          on_demand_allocation_strategy = lookup(
+          instances_distribution.value, "on_demand_allocation_strategy", null)
+          on_demand_base_capacity = lookup(
+          instances_distribution.value, "on_demand_base_capacity", null)
+          on_demand_percentage_above_base_capacity = lookup(
+          instances_distribution.value, "on_demand_percentage_above_base_capacity", null)
+          spot_allocation_strategy = lookup(
+          instances_distribution.value, "spot_allocation_strategy", null)
+          spot_instance_pools = lookup(
+          instances_distribution.value, "spot_instance_pools", null)
+          spot_max_price = lookup(
+          instances_distribution.value, "spot_max_price", null)
+        }
+      }
+      launch_template {
+        launch_template_specification {
+          launch_template_id = mixed_instances_policy.value.launch_template.id
+          version            = mixed_instances_policy.value.launch_template.version
+        }
+        dynamic "override" {
+          for_each = (mixed_instances_policy.value.override != null ?
+          mixed_instances_policy.value.override : [])
+          content {
+            instance_type     = lookup(override.value, "instance_type", null)
+            weighted_capacity = lookup(override.value, "weighted_capacity", null)
+          }
+        }
+      }
+    }
   }
 
   tags = flatten([

diff --git a/variables.tf b/variables.tf
@@ -143,6 +143,26 @@ variable "instance_market_options" {
   default = null
 }
 
+variable mixed_instances_policy {
+  description = "policy to used mixed group of on demand/spot of differing types. Launch template is automatically generated. https://www.terraform.io/docs/providers/aws/r/autoscaling_group.html#mixed_instances_policy-1"
+
+  type = object({
+    instances_distribution = object({
+      on_demand_allocation_strategy            = string
+      on_demand_base_capacity                  = number
+      on_demand_percentage_above_base_capacity = number
+      spot_allocation_strategy                 = string
+      spot_instance_pools                      = number
+      spot_max_price                           = string
+    })
+    override = list(object({
+      instance_type     = string
+      weighted_capacity = number
+    }))
+  })
+  default = null
+}
+
 variable "placement" {
   description = "The placement specifications of the instances"