Add support for ASG scheduled shutdowns and startups

nodegroup/README.md

@@ -108,6 +108,14 @@ Type: `bool`
 
 Default: `true`
 
+### create\_schedule
+
+Description: Schedule shutdown and startup of ASG instances
+
+Type: `bool`
+
+Default: `false`
+
 ### detailed\_monitoring
 
 Description: Enable EC2 detailed monitoring
@@ -211,6 +219,22 @@ Type: `number`
 
 Default: `100`
 
+### scheduled\_shutdown
+
+Description: Scheduled shutdown of ASG instances in UTC
+
+Type: `string`
+
+Default: `"00 09 * * MON-FRI"`
+
+### scheduled\_startup
+
+Description: Scheduled startup of ASG instances in UTC
+
+Type: `string`
+
+Default: `"00 21 * * SUN-THU"`
+
 ### spot\_allocation\_strategy
 
 Description: How to allocate capacity across the Spot pools

nodegroup/asg-schedule.tf

@@ -0,0 +1,21 @@
+# Stop all instances each weekday at 6pm 
+resource "aws_autoscaling_schedule" "node_shutdown" {
+  count                  = var.create_schedule ? length(var.vpc_subnets) : 0
+  scheduled_action_name  = "eks-${var.cluster_name}-nodes-shutdown-${var.nodegroup_name}-${count.index}"
+  min_size               = 0
+  max_size               = 0
+  desired_capacity       = 0
+  recurrence             = var.scheduled_shutdown
+  autoscaling_group_name = aws_autoscaling_group.node[count.index].name
+}
+
+# Startup 1 instance each weekday at 9am 
+resource "aws_autoscaling_schedule" "node_startup" {
+  count                  = var.create_schedule ? length(var.vpc_subnets) : 0
+  scheduled_action_name  = "eks-${var.cluster_name}-nodes-startup-${var.nodegroup_name}-${count.index}"
+  min_size               = var.asg_min_size
+  max_size               = var.asg_max_size
+  desired_capacity       = var.asg_desired_capacity
+  recurrence             = var.scheduled_startup
+  autoscaling_group_name = aws_autoscaling_group.node[count.index].name
+}

nodegroup/variables.tf

@@ -165,6 +165,24 @@ variable "proxy_bypass" {
   default     = "169.254.169.254,.eks.amazonaws.com"
 }
 
+variable "create_schedule" {
+  type        = bool
+  description = "Schedule shutdown and startup of ASG instances"
+  default     = false
+}
+
+variable "scheduled_shutdown" {
+  description = "Scheduled shutdown of ASG instances in UTC"
+  type        = string
+  default     = "00 09 * * MON-FRI" # 7pm Mon-Fri AEST
+}
+
+variable "scheduled_startup" {
+  description = "Scheduled startup of ASG instances in UTC"
+  type        = string
+  default     = "00 21 * * SUN-THU" # 7am Mon-Fri AEST
+}
+
 variable "tags" {
   description = "Tags to apply to created resources"
   type        = map(string)