ECS Service ConnectをTerraformでデプロイしてみた

[
  {
    "name": "nginx-container",
    "image": "nginx:latest",
    "essential": true,
    "memory": 128,
    "portMappings": [
      {
        "name": "webserver",
        "protocol": "tcp",
        "containerPort": 80,
        "appProtocol": "http"
      }
    ],
    "logConfiguration": {
      "logDriver": "awslogs",
      "options": {
        "awslogs-group": "/ecs/nginx",
        "awslogs-region": "ap-northeast-1",
        "awslogs-stream-prefix": "nginx"
      }
    }
  }
]

# ロググループ
resource "aws_cloudwatch_log_group" "log_nginx" {
  name = "/ecs/nginx"
}

resource "aws_cloudwatch_log_group" "log_connect_client" {
  name = "/ecs/svccon-client"
}

resource "aws_cloudwatch_log_group" "log_connect_server" {
  name = "/ecs/svccon-server"
}

# タスク定義
resource "aws_ecs_task_definition" "task" {
  family                   = "nginx-task"
  cpu                      = "256"
  memory                   = "512"
  network_mode             = "awsvpc"
  task_role_arn            = aws_iam_role.task_role.arn
  execution_role_arn       = aws_iam_role.execution_role.arn
  requires_compatibilities = ["FARGATE"]
  container_definitions    = file("./container_definitions.json")
}

# クラスター
resource "aws_ecs_cluster" "cluster" {
  name = "test-cluster"
}

# 名前空間
resource "aws_service_discovery_http_namespace" "namespace" {
  name = "test-namespace"
}


# サービス(クライアント側)
resource "aws_ecs_service" "client" {
  name                   = "nginx-client"
  cluster                = aws_ecs_cluster.cluster.arn
  task_definition        = aws_ecs_task_definition.task.arn
  desired_count          = 1
  launch_type            = "FARGATE"
  platform_version       = "1.4.0"
  enable_execute_command = true

  network_configuration {
    assign_public_ip = true
    security_groups  = [aws_security_group.sg.id]
    subnets          = [aws_subnet.public_1.id, aws_subnet.public_2.id]
  }

  service_connect_configuration {
    enabled = true

    log_configuration {
      log_driver = "awslogs"
      options = {
        awslogs-group         = "/ecs/svccon-client"
        awslogs-region        = "ap-northeast-1"
        awslogs-stream-prefix = "svccon-client"
      }
    }

    namespace = aws_service_discovery_http_namespace.namespace.arn
  }
}

# サービス(サーバー側)
resource "aws_ecs_service" "server" {
  name                   = "nginx-server"
  cluster                = aws_ecs_cluster.cluster.arn
  task_definition        = aws_ecs_task_definition.task.arn
  desired_count          = 1
  launch_type            = "FARGATE"
  platform_version       = "1.4.0"
  enable_execute_command = true

  network_configuration {
    assign_public_ip = true
    security_groups  = [aws_security_group.sg.id]
    subnets          = [aws_subnet.public_1.id, aws_subnet.public_2.id]
  }

  service_connect_configuration {
    enabled = true

    log_configuration {
      log_driver = "awslogs"
      options = {
        awslogs-group         = "/ecs/svccon-server"
        awslogs-region        = "ap-northeast-1"
        awslogs-stream-prefix = "svccon-server"
      }
    }

    namespace = aws_service_discovery_http_namespace.namespace.arn

    service {
      client_alias {
        port = 80
      }
      port_name = "webserver"
    }
  }
}

# ECSタスクロール
data "aws_iam_policy_document" "ecs_task_doc" {
  statement {
    effect = "Allow"
    principals {
      type        = "Service"
      identifiers = ["ecs-tasks.amazonaws.com"]
    }
    actions = ["sts:AssumeRole"]
  }
}

resource "aws_iam_role" "task_role" {
  name               = "nginx-task-role"
  assume_role_policy = data.aws_iam_policy_document.ecs_task_doc.json
}

data "aws_iam_policy_document" "ecs_exec_doc" {
  ## SSMサービス関連のアクセス許可
  version = "2012-10-17"
  statement {
    effect = "Allow"
    actions = [
      "ssmmessages:CreateControlChannel",
      "ssmmessages:CreateDataChannel",
      "ssmmessages:OpenControlChannel",
      "ssmmessages:OpenDataChannel"
    ]
    resources = ["*"]
  }
}

resource "aws_iam_policy" "ecs_exec_policy" {
  name   = "AmazonECSExecPolicy"
  policy = data.aws_iam_policy_document.ecs_exec_doc.json
}

resource "aws_iam_role_policy_attachment" "task_attachement" {
  role       = aws_iam_role.task_role.name
  policy_arn = aws_iam_policy.ecs_exec_policy.arn
}

# ECSタスク実行ロール
resource "aws_iam_role" "execution_role" {
  name               = "nginx-execution-role"
  assume_role_policy = data.aws_iam_policy_document.ecs_task_doc.json
}

resource "aws_iam_role_policy_attachment" "execution_attachement" {
  role       = aws_iam_role.execution_role.name
  policy_arn = "arn:aws:iam::aws:policy/service-role/AmazonECSTaskExecutionRolePolicy"
}

# プロバイダー情報
provider "aws" {
  region = "ap-northeast-1"
}

# デフォルトセキュリティグループ(デフォルトルール削除のため)
resource "aws_default_security_group" "dfsg" {
  vpc_id = aws_vpc.vpc.id
}

# ECSサービス用セキュリティグループ
resource "aws_security_group" "sg" {
  name        = "ecs-sg"
  description = "ecs-sg"
  vpc_id      = aws_vpc.vpc.id

  tags = {
    Name = "nginx-sg"
  }
}

resource "aws_security_group_rule" "ingress" {
  type              = "ingress"
  from_port         = 80
  to_port           = 80
  protocol          = "tcp"
  cidr_blocks       = ["0.0.0.0/0"]
  security_group_id = aws_security_group.sg.id
}

resource "aws_security_group_rule" "egress" {
  type              = "egress"
  from_port         = 0
  to_port           = 0
  protocol          = -1
  cidr_blocks       = ["0.0.0.0/0"]
  security_group_id = aws_security_group.sg.id
}

# バージョン情報
terraform {
  required_version = ">=1.0.0"

  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 4.0"
    }
  }
}

# VPC
resource "aws_vpc" "vpc" {
  cidr_block           = "10.0.0.0/16"
  enable_dns_hostnames = true
  enable_dns_support   = true

  tags = {
    Name = "test-vpc"
  }
}

# サブネット
resource "aws_subnet" "public_1" {
  vpc_id                  = aws_vpc.vpc.id
  cidr_block              = "10.0.0.0/24"
  map_public_ip_on_launch = true
  availability_zone       = "ap-northeast-1a"

  tags = {
    Name = "test-public-subnet-1"
  }
}

resource "aws_subnet" "public_2" {
  vpc_id                  = aws_vpc.vpc.id
  cidr_block              = "10.0.1.0/24"
  map_public_ip_on_launch = true
  availability_zone       = "ap-northeast-1c"

  tags = {
    Name = "test-public-subnet-2"
  }
}

# インターネットゲートウェイ
resource "aws_internet_gateway" "igw" {
  vpc_id = aws_vpc.vpc.id

  tags = {
    Name = "test-igw"
  }
}

# ルートテーブル
resource "aws_route_table" "rtb" {
  vpc_id = aws_vpc.vpc.id

  tags = {
    Name = "test-public-rtb"
  }
}

resource "aws_route" "tf_route_igw" {
  route_table_id         = aws_route_table.rtb.id
  gateway_id             = aws_internet_gateway.igw.id
  destination_cidr_block = "0.0.0.0/0"
}

resource "aws_route_table_association" "associate_1" {
  route_table_id = aws_route_table.rtb.id
  subnet_id      = aws_subnet.public_1.id
}

resource "aws_route_table_association" "associate_2" {
  route_table_id = aws_route_table.rtb.id
  subnet_id      = aws_subnet.public_2.id
}