Add example with terraform

tests/terraform/.gitignore

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+terraform.tfstate*
+.terraform*

tests/terraform/README.md

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+## An example of deployments by ecspresso and Terraform
+
+This example shows how to deploy an ECS service by ecspresso and Terraform.
+
+### Prerequisites
+
+- [Terraform](https://www.terraform.io/) >= v1.4.0
+- [ecspresso](https://github.com/kayac/ecspresso) >= v2.0.0
+
+#### Environment variables
+
+- `AWS_REGION` for AWS region. (e.g. `ap-northeast-1`)
+- `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`, or `AWS_PROFILE` for AWS credentials.
+- `AWS_SDK_LOAD_CONFIG=true` may be required if you use `AWS_PROFILE` and `~/.aws/config`.
+
+### Usage
+
+Terraform creates AWS resources (VPC, Subnets, ALB, IAM roles, ECS cluster, etc.) for ECS service working with ALB. And ecspresso deploys the service into the ECS cluster.
+
+```console
+$ terraform init
+$ terraform apply
+$ ecspresso verify
+$ ecspresso deploy
+```
+
+After completing the deployment, you can access the service via ALB.
+
+```console
+$ curl -s "http://$(terraform output -raw alb_dns_name)/"
+```
+
+Note: This example contains availability zone named a, b, and d. If your AWS account does not have some of them, you can change the resources for them from [vpc.tf](./vpc.tf), [alb.tf](./alb.tf) and [ecs-service-def.jsonnet](./ecs-service-def.jsonnet).
+
+### Usage with AWS CodeDeploy
+
+At first, you must delete an ECS service that having "ECS" deployment controller.
+
+```console
+$ ecspresso delete --force --terminate
+```
+
+Note: After the ECS service is deleted, wait a few minutes until the ECS service is completely removed. While `ecspresso status` reports `DRAINING`, you cannot create a new ECS service with the same name. After `ecspresso status` reports `is INACTIVE`, you can continue to the next step.
+
+Edit `ecs-service-def.jsonnet`. Remove `deploymentCircuitBreaker` block and change `deployment_controller` to `CODE_DEPLOY`.
+
+```diff
+{
+   deploymentConfiguration: {
+-    deploymentCircuitBreaker: {
+-      enable: false,
+-      rollback: false,
+-    },
+     maximumPercent: 200,
+     minimumHealthyPercent: 100,
+   },
+   deploymentController: {
+-    type: 'ECS',
++    type: 'CODE_DEPLOY',
+   },
+```
+
+Then deploy the service again.
+
+```console
+$ ecspresso deploy
+```
+
+After completing the deployment, you have to create a CodeDeploy application and deployment group.
+Uncomment [codedeploy.tf](./codedeploy.tf) and run `terraform apply` again.
+
+Now you can deploy the service by ecspresso using CodeDeploy!
+
+```console
+$ ecspresso deploy
+```
+
+### Cleanup
+
+You must delete the ECS service and tasks first. And then, you can delete the resources created by Terraform.
+
+```console
+$ ecspresso delete --terminate
+$ terraform destroy
+```

tests/terraform/alb.tf

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+resource "aws_lb" "main" {
+  name               = var.project
+  internal           = false
+  load_balancer_type = "application"
+  security_groups = [
+    aws_security_group.alb.id,
+    aws_security_group.default.id,
+  ]
+  subnets = [
+    aws_subnet.public-a.id,
+    aws_subnet.public-c.id,
+    aws_subnet.public-d.id,
+  ]
+  tags = {
+    Name = var.project
+  }
+}
+
+resource "aws_lb_target_group" "http" {
+  for_each             = toset(["alpha", "beta"])
+  name                 = "${var.project}-${each.key}"
+  port                 = 80
+  target_type          = "ip"
+  vpc_id               = aws_vpc.main.id
+  protocol             = "HTTP"
+  deregistration_delay = 5
+
+  health_check {
+    path                = "/"
+    port                = "traffic-port"
+    protocol            = "HTTP"
+    healthy_threshold   = 2
+    unhealthy_threshold = 10
+    timeout             = 5
+    interval            = 6
+  }
+  tags = {
+    Name = "${var.project}-${each.key}"
+  }
+
+  lifecycle {
+    create_before_destroy = true
+  }
+}
+
+resource "aws_lb_listener" "http" {
+  load_balancer_arn = aws_lb.main.arn
+  port              = 80
+  protocol          = "HTTP"
+
+  default_action {
+    type             = "forward"
+    target_group_arn = aws_lb_target_group.http["alpha"].arn
+  }
+
+  tags = {
+    Name = "${var.project}-http"
+  }
+}
+
+output "alb_dns_name" {
+  value = aws_lb.main.dns_name
+}

tests/terraform/codedeploy.tf

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+/*
+
+resource "aws_codedeploy_app" "main" {
+  name             = var.project
+  compute_platform = "ECS"
+}
+
+resource "aws_codedeploy_deployment_group" "main" {
+  app_name               = aws_codedeploy_app.main.name
+  deployment_config_name = "CodeDeployDefault.ECSAllAtOnce"
+  deployment_group_name  = var.project
+  service_role_arn       = aws_iam_role.codedeploy.arn
+
+  auto_rollback_configuration {
+    enabled = true
+    events  = ["DEPLOYMENT_FAILURE"]
+  }
+
+  blue_green_deployment_config {
+    deployment_ready_option {
+      action_on_timeout = "CONTINUE_DEPLOYMENT"
+    }
+    terminate_blue_instances_on_deployment_success {
+      action = "TERMINATE"
+    }
+  }
+
+  deployment_style {
+    deployment_option = "WITH_TRAFFIC_CONTROL"
+    deployment_type   = "BLUE_GREEN"
+  }
+
+  ecs_service {
+    cluster_name = aws_ecs_cluster.main.name
+    service_name = var.project
+  }
+
+  load_balancer_info {
+    target_group_pair_info {
+      prod_traffic_route {
+        listener_arns = [aws_lb_listener.http.arn]
+      }
+      target_group {
+        name = aws_lb_target_group.http["alpha"].name
+      }
+      target_group {
+        name = aws_lb_target_group.http["beta"].name
+      }
+    }
+  }
+}
+
+resource "aws_iam_role" "codedeploy" {
+  name = "${var.project}-codedeploy"
+  assume_role_policy = jsonencode({
+    Version = "2012-10-17"
+    Statement = [
+      {
+        Action = "sts:AssumeRole"
+        Principal = {
+          Service = "codedeploy.amazonaws.com"
+        }
+        Effect = "Allow"
+        Sid    = ""
+      }
+    ]
+  })
+}
+
+data "aws_iam_policy" "codedeploy" {
+  arn = "arn:aws:iam::aws:policy/AWSCodeDeployRoleForECS"
+}
+
+resource "aws_iam_role_policy_attachment" "codedeploy" {
+  policy_arn = data.aws_iam_policy.codedeploy.arn
+  role       = aws_iam_role.codedeploy.name
+}
+
+*/

tests/terraform/config.tf

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+variable "project" {
+  type    = string
+  default = "ecspresso"
+}
+
+provider "aws" {
+  region = "ap-northeast-1"
+  default_tags {
+    tags = {
+      "env" = "${var.project}"
+    }
+  }
+}
+
+terraform {
+  required_version = ">= 1.4.0"
+
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 4.65.0"
+    }
+  }
+}
+
+data "aws_caller_identity" "current" {
+}

tests/terraform/ecs-service-def.jsonnet

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+{
+  deploymentConfiguration: {
+    // remove deploymentCircuitBreaker when deployment controller is CODE_DEPLOY
+    deploymentCircuitBreaker: {
+      enable: false,
+      rollback: false,
+    },
+    maximumPercent: 200,
+    minimumHealthyPercent: 100,
+  },
+  deploymentController: {
+    type: 'ECS', // ECS or CODE_DEPLOY
+  },
+  desiredCount: 1,
+  enableECSManagedTags: false,
+  enableExecuteCommand: true,
+  healthCheckGracePeriodSeconds: 0,
+  launchType: 'FARGATE',
+  loadBalancers: [
+    {
+      containerName: 'nginx',
+      containerPort: 80,
+      targetGroupArn: "{{ tfstate `aws_lb_target_group.http['alpha'].arn` }}",
+    },
+  ],
+  networkConfiguration: {
+    awsvpcConfiguration: {
+      assignPublicIp: 'ENABLED',
+      securityGroups: [
+        '{{ tfstate `aws_security_group.default.id` }}',
+      ],
+      subnets: [
+        '{{ tfstate `aws_subnet.public-a.id` }}',
+        '{{ tfstate `aws_subnet.public-c.id` }}',
+        '{{ tfstate `aws_subnet.public-d.id` }}',
+      ],
+    },
+  },
+  platformFamily: 'Linux',
+  platformVersion: '1.4.0',
+  propagateTags: 'SERVICE',
+  schedulingStrategy: 'REPLICA',
+  tags: [
+    {
+      key: 'env',
+      value: 'ecspresso',
+    },
+  ],
+}

tests/terraform/ecs-task-def.jsonnet

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+{
+  containerDefinitions: [
+    {
+      cpu: 0,
+      essential: true,
+      image: 'nginx:latest',
+      logConfiguration: {
+        logDriver: 'awslogs',
+        options: {
+          'awslogs-create-group': 'true',
+          'awslogs-group': '{{tfstate `aws_cloudwatch_log_group.main.name`}}',
+          'awslogs-region': '{{ must_env `AWS_REGION` }}',
+          'awslogs-stream-prefix': 'nginx',
+        },
+      },
+      name: 'nginx',
+      portMappings: [
+        {
+          appProtocol: '',
+          containerPort: 80,
+          hostPort: 80,
+          protocol: 'tcp',
+        },
+      ],
+    },
+    {
+      command: [
+        'tail',
+        '-f',
+        '/dev/null',
+      ],
+      cpu: 0,
+      essential: true,
+      image: 'debian:bullseye-slim',
+      logConfiguration: {
+        logDriver: 'awslogs',
+        options: {
+          'awslogs-create-group': 'true',
+          'awslogs-group': '{{tfstate `aws_cloudwatch_log_group.main.name`}}',
+          'awslogs-region': '{{ must_env `AWS_REGION` }}',
+          'awslogs-stream-prefix': 'bash',
+        },
+      },
+      name: 'bash',
+      secrets: [
+        {
+          name: 'FOO',
+          valueFrom: '{{tfstate `aws_ssm_parameter.foo.name`}}'
+        },
+        {
+          name: 'BAR',
+          valueFrom: '{{tfstate `aws_secretsmanager_secret.bar.arn`}}'
+        },
+        {
+          name: 'JSON_KEY',
+          valueFrom: '{{tfstate `aws_secretsmanager_secret.json.arn`}}:key::'
+        },
+      ],
+    },
+  ],
+  cpu: '256',
+  ephemeralStorage: {
+    sizeInGiB: 30,
+  },
+  executionRoleArn: '{{tfstate `aws_iam_role.ecs-task.arn`}}',
+  family: 'ecspresso',
+  memory: '512',
+  networkMode: 'awsvpc',
+  requiresCompatibilities: [
+    'FARGATE',
+  ],
+  tags: [
+    {
+      key: 'env',
+      value: 'ecspresso',
+    },
+  ],
+  taskRoleArn: '{{tfstate `aws_iam_role.ecs-task.arn`}}',
+}

tests/terraform/ecs.tf

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+resource "aws_ecs_cluster" "main" {
+  name = var.project
+  tags = {
+    Name = var.project
+  }
+}