UPD: added back spot instance support

modules/compute/ec2_default_tags/main.tf

@@ -27,6 +27,21 @@ resource "aws_instance" "ec2-instance" {
     }
   }
 
+  # spot instance option
+  dynamic "instance_market_options" {
+    for_each = var.spot-max-price > 0 ? { use_spot : true } : {}
+    content {
+      market_type = "spot"
+
+      dynamic "spot_options" {
+        for_each = { use_spot : true }
+        content {
+          max_price = var.spot-max-price
+        }
+      }
+    }
+  }
+
   disable_api_termination = var.enable-termination-protection
   user_data               = var.user-data
   monitoring              = var.enable-detail-monitoring

modules/compute/ec2_default_tags/variable.tf

@@ -95,3 +95,8 @@ variable "enable-detail-monitoring" {
   default     = false
   description = "Set true to enable detail monitoring"
 }
+variable spot-max-price {
+  type = number
+  description = "Max hourly price for spot instance. If greater than zero, spot instance will be used."
+  default = 0
+}