feat: ASG ローリングデプロイをモジュール化

ch8.production-grade-infrastructure/modules/cluster/asg-rolling-deploy/main.tf

@@ -0,0 +1,148 @@
+terraform {
+  required_version = ">= 1.0.0, < 2.0.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 5.0"
+    }
+  }
+}
+
+resource "aws_launch_configuration" "example" {
+  image_id        = var.ami
+  instance_type   = var.instance_type
+  security_groups = [aws_security_group.instance.id]
+
+  user_data = templatefile("${path.module}/user-data.sh", {
+    server_text = var.server_text
+    server_port = var.server_port
+    db_address  = data.terraform_remote_state.db.outputs.address
+    db_port     = data.terraform_remote_state.db.outputs.port
+  })
+
+  # ASG がある起動設定を使う場合は必須
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "aws_autoscaling_group" "example" {
+  name = var.cluster_name
+
+  launch_configuration = aws_launch_configuration.example.name
+  vpc_zone_identifier  = data.aws_subnets.default.ids
+
+  target_group_arns = [aws_lb_target_group.asg.arn]
+  health_check_type = "ELB"
+
+  min_size = var.min_size
+  max_size = var.max_size
+
+  # ASG の変更を展開する歳にはインスタンスを更新する
+  instance_refresh {
+    strategy = "Rolling"
+    preferences {
+      min_healthy_percentage = 50
+    }
+  }
+
+  tag {
+    key                 = "Name"
+    value               = var.cluster_name
+    propagate_at_launch = true
+  }
+
+  dynamic "tag" {
+    for_each = {
+      for key, value in var.custom_tags :
+      key => upper(value)
+      if key != "Name"
+    }
+
+    content {
+      key                 = tag.key
+      value               = tag.value
+      propagate_at_launch = true
+    }
+  }
+}
+
+resource "aws_autoscaling_schedule" "scale_out_during_buisiness_hours" {
+  count = var.enable_autoscaling ? 1 : 0
+
+  scheduled_action_name = "${var.cluster_name}-scale-out-during-buisiness-hours"
+  min_size              = 2
+  max_size              = 10
+  desired_capacity      = 10
+  recurrence            = "0 9 * * *"
+
+  autoscaling_group_name = aws_autoscaling_group.example.name
+}
+
+resource "aws_autoscaling_schedule" "scale_in_at_night" {
+  count = var.enable_autoscaling ? 1 : 0
+
+  scheduled_action_name = "${var.cluster_name}-scale-in-at-night"
+  min_size              = 2
+  max_size              = 2
+  desired_capacity      = 2
+  recurrence            = "0 17 * * *"
+
+  autoscaling_group_name = aws_autoscaling_group.example.name
+}
+
+resource "aws_security_group" "instance" {
+  name = "${var.cluster_name}-instance"
+}
+
+resource "aws_security_group_rule" "name" {
+  type              = "ingress"
+  security_group_id = aws_security_group.instance.id
+
+  from_port   = var.server_port
+  to_port     = var.server_port
+  protocol    = local.tcp_protocol
+  cidr_blocks = local.all_ips
+}
+
+resource "aws_cloudwatch_metric_alarm" "high_cpu_utilization" {
+  alarm_name  = "${var.cluster_name}-high-cpu-utilization"
+  namespace   = "AWS/EC2"
+  metric_name = "CPUUtilization"
+
+  dimensions = {
+    AutoScalingGroupName = aws_autoscaling_group.example.name
+  }
+
+  comparison_operator = "GreaterThanThreshold"
+  evaluation_periods  = 1
+  period              = 300
+  statistic           = "Average"
+  threshold           = 90
+  unit                = "Percent"
+}
+
+resource "aws_cloudwatch_metric_alarm" "low_cpu_credit_balance" {
+  count = format("%.1s", var.instance_type) == "t" ? 1 : 0
+
+  alarm_name  = "${var.cluster_name}-low-cpu-credit-balance"
+  namespace   = "AWS/EC2"
+  metric_name = "CPUCreditBalance"
+
+  dimensions = {
+    AutoScalingGroupName = aws_autoscaling_group.example.name
+  }
+
+  comparison_operator = "LessThanThreshold"
+  evaluation_periods  = 1
+  period              = 300
+  statistic           = "Minimum"
+  threshold           = 10
+  unit                = "Count"
+}
+
+locals {
+  tcp_protocol = "tcp"
+  all_ips      = ["0.0.0.0/0"]
+}

ch8.production-grade-infrastructure/modules/cluster/asg-rolling-deploy/variables.tf

@@ -0,0 +1,43 @@
+variable "cluster_name" {
+  description = "The name to use for all the cluster resorces"
+  type        = string
+}
+
+variable "ami" {
+  description = "The AMI to run in the cluster"
+  type        = string
+  default     = "ami-067983a1f071c98a2"
+}
+
+variable "instance_type" {
+  type = string
+}
+
+variable "min_size" {
+  type = number
+}
+
+variable "max_size" {
+  type = number
+}
+
+variable "enable_autoscaling" {
+  type = bool
+}
+
+variable "custom_tags" {
+  type    = map(string)
+  default = {}
+}
+
+variable "server_port" {
+  description = "The port the server will use for HTTP requests."
+  type        = number
+  default     = 8080
+}
+
+variable "server_text" {
+  description = "The text the web server should return"
+  type        = string
+  default     = "Hello, World"
+}

ch8.production-grade-infrastructure/modules/webserver-cluster/main.tf

@@ -9,103 +9,6 @@ terraform {
   }
 }
 
-resource "aws_launch_configuration" "example" {
-  image_id        = var.ami
-  instance_type   = var.instance_type
-  security_groups = [aws_security_group.instance.id]
-
-  user_data = templatefile("${path.module}/user-data.sh", {
-    server_text = var.server_text
-    server_port = var.server_port
-    db_address  = data.terraform_remote_state.db.outputs.address
-    db_port     = data.terraform_remote_state.db.outputs.port
-  })
-
-  # ASG がある起動設定を使う場合は必須
-  lifecycle {
-    create_before_destroy = true
-  }
-}
-
-resource "aws_autoscaling_group" "example" {
-  name = var.cluster_name
-
-  launch_configuration = aws_launch_configuration.example.name
-  vpc_zone_identifier  = data.aws_subnets.default.ids
-
-  target_group_arns = [aws_lb_target_group.asg.arn]
-  health_check_type = "ELB"
-
-  min_size = var.min_size
-  max_size = var.max_size
-
-  # ASG の変更を展開する歳にはインスタンスを更新する
-  instance_refresh {
-    strategy = "Rolling"
-    preferences {
-      min_healthy_percentage = 50
-    }
-  }
-
-  tag {
-    key                 = "Name"
-    value               = var.cluster_name
-    propagate_at_launch = true
-  }
-
-  dynamic "tag" {
-    for_each = {
-      for key, value in var.custom_tags :
-      key => upper(value)
-      if key != "Name"
-    }
-
-    content {
-      key                 = tag.key
-      value               = tag.value
-      propagate_at_launch = true
-    }
-  }
-}
-
-resource "aws_autoscaling_schedule" "scale_out_during_buisiness_hours" {
-  count = var.enable_autoscaling ? 1 : 0
-
-  scheduled_action_name = "${var.cluster_name}-scale-out-during-buisiness-hours"
-  min_size              = 2
-  max_size              = 10
-  desired_capacity      = 10
-  recurrence            = "0 9 * * *"
-
-  autoscaling_group_name = aws_autoscaling_group.example.name
-}
-
-resource "aws_autoscaling_schedule" "scale_in_at_night" {
-  count = var.enable_autoscaling ? 1 : 0
-
-  scheduled_action_name = "${var.cluster_name}-scale-in-at-night"
-  min_size              = 2
-  max_size              = 2
-  desired_capacity      = 2
-  recurrence            = "0 17 * * *"
-
-  autoscaling_group_name = aws_autoscaling_group.example.name
-}
-
-resource "aws_security_group" "instance" {
-  name = "${var.cluster_name}-instance"
-}
-
-resource "aws_security_group_rule" "name" {
-  type              = "ingress"
-  security_group_id = aws_security_group.instance.id
-
-  from_port   = var.server_port
-  to_port     = var.server_port
-  protocol    = local.tcp_protocol
-  cidr_blocks = local.all_ips
-}
-
 resource "aws_alb" "example" {
   name               = var.cluster_name
   load_balancer_type = "application"
@@ -207,42 +110,6 @@ data "terraform_remote_state" "db" {
   }
 }
 
-resource "aws_cloudwatch_metric_alarm" "high_cpu_utilization" {
-  alarm_name  = "${var.cluster_name}-high-cpu-utilization"
-  namespace   = "AWS/EC2"
-  metric_name = "CPUUtilization"
-
-  dimensions = {
-    AutoScalingGroupName = aws_autoscaling_group.example.name
-  }
-
-  comparison_operator = "GreaterThanThreshold"
-  evaluation_periods  = 1
-  period              = 300
-  statistic           = "Average"
-  threshold           = 90
-  unit                = "Percent"
-}
-
-resource "aws_cloudwatch_metric_alarm" "low_cpu_credit_balance" {
-  count = format("%.1s", var.instance_type) == "t" ? 1 : 0
-
-  alarm_name  = "${var.cluster_name}-low-cpu-credit-balance"
-  namespace   = "AWS/EC2"
-  metric_name = "CPUCreditBalance"
-
-  dimensions = {
-    AutoScalingGroupName = aws_autoscaling_group.example.name
-  }
-
-  comparison_operator = "LessThanThreshold"
-  evaluation_periods  = 1
-  period              = 300
-  statistic           = "Minimum"
-  threshold           = 10
-  unit                = "Count"
-}
-
 locals {
   http_port    = 80
   any_port     = 0

ch8.production-grade-infrastructure/modules/webserver-cluster/variables.tf

@@ -18,36 +18,3 @@ variable "db_remote_state_key" {
   description = "The path for database's remote state in S3"
   type        = string
 }
-
-variable "instance_type" {
-  type = string
-}
-
-variable "min_size" {
-  type = number
-}
-
-variable "max_size" {
-  type = number
-}
-
-variable "custom_tags" {
-  type    = map(string)
-  default = {}
-}
-
-variable "enable_autoscaling" {
-  type = bool
-}
-
-variable "ami" {
-  description = "The AMI to run in the cluster"
-  type        = string
-  default     = "ami-067983a1f071c98a2"
-}
-
-variable "server_text" {
-  description = "The text the web server should return"
-  type        = string
-  default     = "Hello, World"
-}