terraform-datadog-ecs-ec2

containerDefinitions.json

[
  {
  "name": "datadog-agent",
  "image": "datadog/agent:latest",
  "cpu": ${cpu},
  "memory": ${memory},
  "essential": true,
  "portMappings": [
      {
        "containerPort": 8126,
        "hostPort": 8126
      }
  ],
  "mountPoints": [
    {
      "containerPath": "/var/run/docker.sock",
      "sourceVolume": "docker_sock",
      "readOnly": true
    },
    {
      "containerPath": "/host/sys/fs/cgroup",
      "sourceVolume": "cgroup",
      "readOnly": true
    },
    {
      "containerPath": "/host/proc",
      "sourceVolume": "proc",
      "readOnly": true
    }
  ],
  "environment": [
    {
      "name": "DD_API_KEY",
      "value": "${dd_api_key}"
    },
    {
      "name": "DD_SITE",
      "value": "datadoghq.com"
    },
    {
      "name": "DD_APM_NON_LOCAL_TRAFFIC",
      "value": "true"
    },
    {
      "name": "DD_APM_ENABLED",
      "value": "true"
    }
  ],
  "volumes": [
    {
      "host": {
        "sourcePath": "/var/run/docker.sock"
      },
      "name": "docker_sock"
    },
    {
      "host": {
        "sourcePath": "/proc/"
      },
      "name": "proc"
    },
    {
      "host": {
        "sourcePath": "/sys/fs/cgroup/"
      },
      "name": "cgroup"
    }
  ],
    "family": "datadog-agent-task"
  }
]

main.tf

data "template_file" "container_definitions" {
  template = "${file("${path.module}/templates/containerDefinitions.json")}"

  vars {
    dd_agent_api_key = "${var.dd_agent_api_key}"
    cpu              = "${var.cpu}"
    memory           = "${var.memory}"
  }
}

resource "aws_ecs_task_definition" "datadog_task" {
  family                = "datadog-agent-task"
  container_definitions = "${data.template_file.container_definitions.rendered}"

  volume {
    name      = "docker_sock"
    host_path = "/var/run/docker.sock"
  }

  volume {
    name      = "proc"
    host_path = "/proc/"
  }

  volume {
    name      = "cgroup"
    host_path = "/sys/fs/cgroup/"
  }
}


resource "aws_ecs_service" "datadog_service" {
  name                = "datadog-service"
  cluster             = "${var.ecs_cluster_name}"
  task_definition     = "${aws_ecs_task_definition.datadog_task.arn}"
  launch_type         = "EC2"
  scheduling_strategy = "DAEMON"
  depends_on = ["aws_ecs_task_definition.datadog_task"]
}