def.json

[
  {
    "name": "${definition_name}",
    "image": "${image_tag}",
    "cpu": 64,
    "memory": 256,
    "memoryReservation": 128,
    "essential": true,
    "logConfiguration": {
      "logDriver": "awslogs",
      "Options": {
        "awslogs-region": "${region}",
        "awslogs-group": "${log_group}",
        "awslogs-stream-prefix": "${definition_name}"
      }
    }
  }
]