Request Syntax Request Parameters Response Syntax Response Elements Errors Examples See Also

RegisterTaskDefinition

Registers a new task definition from the supplied family and containerDefinitions. Optionally, you can add data volumes to your containers with the volumes parameter. For more information about task definition parameters and defaults, see Amazon ECS Task Definitions in the Amazon Elastic Container Service Developer Guide.

You can specify an IAM role for your task with the taskRoleArn parameter. When you specify an IAM role for a task, its containers can then use the latest versions of the AWS CLI or SDKs to make API requests to the AWS services that are specified in the IAM policy that's associated with the role. For more information, see IAM Roles for Tasks in the Amazon Elastic Container Service Developer Guide.

You can specify a Docker networking mode for the containers in your task definition with the networkMode parameter. The available network modes correspond to those described in Network settings in the Docker run reference. If you specify the awsvpc network mode, the task is allocated an elastic network interface, and you must specify a NetworkConfiguration when you create a service or run a task with the task definition. For more information, see Task Networking in the Amazon Elastic Container Service Developer Guide.

Request Syntax


{
   "containerDefinitions": [ 
      { 
         "command": [ "string" ],
         "cpu": number,
         "dependsOn": [ 
            { 
               "condition": "string",
               "containerName": "string"
            }
         ],
         "disableNetworking": boolean,
         "dnsSearchDomains": [ "string" ],
         "dnsServers": [ "string" ],
         "dockerLabels": { 
            "string" : "string" 
         },
         "dockerSecurityOptions": [ "string" ],
         "entryPoint": [ "string" ],
         "environment": [ 
            { 
               "name": "string",
               "value": "string"
            }
         ],
         "environmentFiles": [ 
            { 
               "type": "string",
               "value": "string"
            }
         ],
         "essential": boolean,
         "extraHosts": [ 
            { 
               "hostname": "string",
               "ipAddress": "string"
            }
         ],
         "firelensConfiguration": { 
            "options": { 
               "string" : "string" 
            },
            "type": "string"
         },
         "healthCheck": { 
            "command": [ "string" ],
            "interval": number,
            "retries": number,
            "startPeriod": number,
            "timeout": number
         },
         "hostname": "string",
         "image": "string",
         "interactive": boolean,
         "links": [ "string" ],
         "linuxParameters": { 
            "capabilities": { 
               "add": [ "string" ],
               "drop": [ "string" ]
            },
            "devices": [ 
               { 
                  "containerPath": "string",
                  "hostPath": "string",
                  "permissions": [ "string" ]
               }
            ],
            "initProcessEnabled": boolean,
            "maxSwap": number,
            "sharedMemorySize": number,
            "swappiness": number,
            "tmpfs": [ 
               { 
                  "containerPath": "string",
                  "mountOptions": [ "string" ],
                  "size": number
               }
            ]
         },
         "logConfiguration": { 
            "logDriver": "string",
            "options": { 
               "string" : "string" 
            },
            "secretOptions": [ 
               { 
                  "name": "string",
                  "valueFrom": "string"
               }
            ]
         },
         "memory": number,
         "memoryReservation": number,
         "mountPoints": [ 
            { 
               "containerPath": "string",
               "readOnly": boolean,
               "sourceVolume": "string"
            }
         ],
         "name": "string",
         "portMappings": [ 
            { 
               "containerPort": number,
               "hostPort": number,
               "protocol": "string"
            }
         ],
         "privileged": boolean,
         "pseudoTerminal": boolean,
         "readonlyRootFilesystem": boolean,
         "repositoryCredentials": { 
            "credentialsParameter": "string"
         },
         "resourceRequirements": [ 
            { 
               "type": "string",
               "value": "string"
            }
         ],
         "secrets": [ 
            { 
               "name": "string",
               "valueFrom": "string"
            }
         ],
         "startTimeout": number,
         "stopTimeout": number,
         "systemControls": [ 
            { 
               "namespace": "string",
               "value": "string"
            }
         ],
         "ulimits": [ 
            { 
               "hardLimit": number,
               "name": "string",
               "softLimit": number
            }
         ],
         "user": "string",
         "volumesFrom": [ 
            { 
               "readOnly": boolean,
               "sourceContainer": "string"
            }
         ],
         "workingDirectory": "string"
      }
   ],
   "cpu": "string",
   "ephemeralStorage": { 
      "sizeInGiB": number
   },
   "executionRoleArn": "string",
   "family": "string",
   "inferenceAccelerators": [ 
      { 
         "deviceName": "string",
         "deviceType": "string"
      }
   ],
   "ipcMode": "string",
   "memory": "string",
   "networkMode": "string",
   "pidMode": "string",
   "placementConstraints": [ 
      { 
         "expression": "string",
         "type": "string"
      }
   ],
   "proxyConfiguration": { 
      "containerName": "string",
      "properties": [ 
         { 
            "name": "string",
            "value": "string"
         }
      ],
      "type": "string"
   },
   "requiresCompatibilities": [ "string" ],
   "runtimePlatform": { 
      "cpuArchitecture": "string",
      "operatingSystemFamily": "string"
   },
   "tags": [ 
      { 
         "key": "string",
         "value": "string"
      }
   ],
   "taskRoleArn": "string",
   "volumes": [ 
      { 
         "dockerVolumeConfiguration": { 
            "autoprovision": boolean,
            "driver": "string",
            "driverOpts": { 
               "string" : "string" 
            },
            "labels": { 
               "string" : "string" 
            },
            "scope": "string"
         },
         "efsVolumeConfiguration": { 
            "authorizationConfig": { 
               "accessPointId": "string",
               "iam": "string"
            },
            "fileSystemId": "string",
            "rootDirectory": "string",
            "transitEncryption": "string",
            "transitEncryptionPort": number
         },
         "fsxWindowsFileServerVolumeConfiguration": { 
            "authorizationConfig": { 
               "credentialsParameter": "string",
               "domain": "string"
            },
            "fileSystemId": "string",
            "rootDirectory": "string"
         },
         "host": { 
            "sourcePath": "string"
         },
         "name": "string"
      }
   ]
}

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

containerDefinitions

A list of container definitions in JSON format that describe the different containers that make up your task.

Type: Array of ContainerDefinition objects

Required: Yes

cpu

The number of CPU units used by the task. It can be expressed as an integer using CPU units (for example, 1024) or as a string using vCPUs (for example, 1 vCPU or 1 vcpu) in a task definition. String values are converted to an integer indicating the CPU units when the task definition is registered.

Note

Task-level CPU and memory parameters are ignored for Windows containers. We recommend specifying container-level resources for Windows containers.

If you're using the EC2 launch type, this field is optional. Supported values are between 128 CPU units (0.125 vCPUs) and 10240 CPU units (10 vCPUs).

If you're using the Fargate launch type, this field is required and you must use one of the following values, which determines your range of supported values for the memory parameter:

The CPU units cannot be less than 1 vCPU when you use Windows containers on Fargate.

256 (.25 vCPU) - Available memory values: 512 (0.5 GB), 1024 (1 GB), 2048 (2 GB)
512 (.5 vCPU) - Available memory values: 1024 (1 GB), 2048 (2 GB), 3072 (3 GB), 4096 (4 GB)
1024 (1 vCPU) - Available memory values: 2048 (2 GB), 3072 (3 GB), 4096 (4 GB), 5120 (5 GB), 6144 (6 GB), 7168 (7 GB), 8192 (8 GB)
2048 (2 vCPU) - Available memory values: Between 4096 (4 GB) and 16384 (16 GB) in increments of 1024 (1 GB)
4096 (4 vCPU) - Available memory values: Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB)

Type: String

Required: No

ephemeralStorage

The amount of ephemeral storage to allocate for the task. This parameter is used to expand the total amount of ephemeral storage available, beyond the default amount, for tasks hosted on AWS Fargate. For more information, see Fargate task storage in the Amazon ECS User Guide for AWS Fargate .

Note

This parameter is only supported for tasks hosted on Fargate using the following platform versions:

Linux platform version 1.4.0 or later.
Windows platform version 1.0.0 or later.

Type: EphemeralStorage object

Required: No

executionRoleArn

The Amazon Resource Name (ARN) of the task execution role that grants the Amazon ECS container agent permission to make AWS API calls on your behalf. The task execution IAM role is required depending on the requirements of your task. For more information, see Amazon ECS task execution IAM role in the Amazon Elastic Container Service Developer Guide.

Type: String

Required: No

family

You must specify a family for a task definition. You can use it track multiple versions of the same task definition. The family is used as a name for your task definition. Up to 255 letters (uppercase and lowercase), numbers, underscores, and hyphens are allowed.

Type: String

Required: Yes

inferenceAccelerators

The Elastic Inference accelerators to use for the containers in the task.

Type: Array of InferenceAccelerator objects

Required: No

ipcMode

The IPC resource namespace to use for the containers in the task. The valid values are host, task, or none. If host is specified, then all containers within the tasks that specified the host IPC mode on the same container instance share the same IPC resources with the host Amazon EC2 instance. If task is specified, all containers within the specified task share the same IPC resources. If none is specified, then IPC resources within the containers of a task are private and not shared with other containers in a task or on the container instance. If no value is specified, then the IPC resource namespace sharing depends on the Docker daemon setting on the container instance. For more information, see IPC settings in the Docker run reference.

If the host IPC mode is used, be aware that there is a heightened risk of undesired IPC namespace expose. For more information, see Docker security.

If you are setting namespaced kernel parameters using systemControls for the containers in the task, the following will apply to your IPC resource namespace. For more information, see System Controls in the Amazon Elastic Container Service Developer Guide.

For tasks that use the host IPC mode, IPC namespace related systemControls are not supported.
For tasks that use the task IPC mode, IPC namespace related systemControls will apply to all containers within a task.

Note

This parameter is not supported for Windows containers or tasks run on AWS Fargate.

Type: String

Valid Values: host | task | none

Required: No

memory

The amount of memory (in MiB) used by the task. It can be expressed as an integer using MiB (for example ,1024) or as a string using GB (for example, 1GB or 1 GB) in a task definition. String values are converted to an integer indicating the MiB when the task definition is registered.

Note

Task-level CPU and memory parameters are ignored for Windows containers. We recommend specifying container-level resources for Windows containers.

If using the EC2 launch type, this field is optional.

If using the Fargate launch type, this field is required and you must use one of the following values. This determines your range of supported values for the cpu parameter.

The CPU units cannot be less than 1 vCPU when you use Windows containers on Fargate.

512 (0.5 GB), 1024 (1 GB), 2048 (2 GB) - Available cpu values: 256 (.25 vCPU)
1024 (1 GB), 2048 (2 GB), 3072 (3 GB), 4096 (4 GB) - Available cpu values: 512 (.5 vCPU)
2048 (2 GB), 3072 (3 GB), 4096 (4 GB), 5120 (5 GB), 6144 (6 GB), 7168 (7 GB), 8192 (8 GB) - Available cpu values: 1024 (1 vCPU)
Between 4096 (4 GB) and 16384 (16 GB) in increments of 1024 (1 GB) - Available cpu values: 2048 (2 vCPU)
Between 8192 (8 GB) and 30720 (30 GB) in increments of 1024 (1 GB) - Available cpu values: 4096 (4 vCPU)

Type: String

Required: No

networkMode

The Docker networking mode to use for the containers in the task. The valid values are none, bridge, awsvpc, and host. If no network mode is specified, the default is bridge.

For Amazon ECS tasks on Fargate, the awsvpc network mode is required. For Amazon ECS tasks on Amazon EC2 Linux instances, any network mode can be used. For Amazon ECS tasks on Amazon EC2 Windows instances, <default> or awsvpc can be used. If the network mode is set to none, you cannot specify port mappings in your container definitions, and the tasks containers do not have external connectivity. The host and awsvpc network modes offer the highest networking performance for containers because they use the EC2 network stack instead of the virtualized network stack provided by the bridge mode.

With the host and awsvpc network modes, exposed container ports are mapped directly to the corresponding host port (for the host network mode) or the attached elastic network interface port (for the awsvpc network mode), so you cannot take advantage of dynamic host port mappings.

Important

When using the host network mode, you should not run containers using the root user (UID 0). It is considered best practice to use a non-root user.

If the network mode is awsvpc, the task is allocated an elastic network interface, and you must specify a NetworkConfiguration value when you create a service or run a task with the task definition. For more information, see Task Networking in the Amazon Elastic Container Service Developer Guide.

If the network mode is host, you cannot run multiple instantiations of the same task on a single container instance when port mappings are used.

For more information, see Network settings in the Docker run reference.

Type: String

Valid Values: bridge | host | awsvpc | none

Required: No

pidMode

The process namespace to use for the containers in the task. The valid values are host or task. If host is specified, then all containers within the tasks that specified the host PID mode on the same container instance share the same process namespace with the host Amazon EC2 instance. If task is specified, all containers within the specified task share the same process namespace. If no value is specified, the default is a private namespace. For more information, see PID settings in the Docker run reference.

If the host PID mode is used, be aware that there is a heightened risk of undesired process namespace expose. For more information, see Docker security.

Note

This parameter is not supported for Windows containers or tasks run on AWS Fargate.

Type: String

Valid Values: host | task

Required: No

placementConstraints

An array of placement constraint objects to use for the task. You can specify a maximum of 10 constraints for each task. This limit includes constraints in the task definition and those specified at runtime.

Type: Array of TaskDefinitionPlacementConstraint objects

Required: No

proxyConfiguration

The configuration details for the App Mesh proxy.

For tasks hosted on Amazon EC2 instances, the container instances require at least version 1.26.0 of the container agent and at least version 1.26.0-1 of the ecs-init package to use a proxy configuration. If your container instances are launched from the Amazon ECS-optimized AMI version 20190301 or later, then they contain the required versions of the container agent and ecs-init. For more information, see Amazon ECS-optimized AMI versions in the Amazon Elastic Container Service Developer Guide.

Type: ProxyConfiguration object

Required: No

requiresCompatibilities

The task launch type that Amazon ECS validates the task definition against. A client exception is returned if the task definition doesn't validate against the compatibilities specified. If no value is specified, the parameter is omitted from the response.

Type: Array of strings

Valid Values: EC2 | FARGATE | EXTERNAL

Required: No

runtimePlatform

The operating system that your tasks definitions run on. A platform family is specified only for tasks using the Fargate launch type.

When you specify a task definition in a service, this value must match the runtimePlatform value of the service.

Type: RuntimePlatform object

Required: No

tags

The metadata that you apply to the task definition to help you categorize and organize them. Each tag consists of a key and an optional value. You define both of them.

The following basic restrictions apply to tags:

Maximum number of tags per resource - 50
For each resource, each tag key must be unique, and each tag key can have only one value.
Maximum key length - 128 Unicode characters in UTF-8
Maximum value length - 256 Unicode characters in UTF-8
If your tagging schema is used across multiple services and resources, remember that other services may have restrictions on allowed characters. Generally allowed characters are: letters, numbers, and spaces representable in UTF-8, and the following characters: + - = . _ : / @.
Tag keys and values are case-sensitive.
Do not use aws:, AWS:, or any upper or lowercase combination of such as a prefix for either keys or values as it is reserved for AWS use. You cannot edit or delete tag keys or values with this prefix. Tags with this prefix do not count against your tags per resource limit.

Type: Array of Tag objects

Array Members: Minimum number of 0 items. Maximum number of 50 items.

Required: No

taskRoleArn

The short name or full Amazon Resource Name (ARN) of the IAM role that containers in this task can assume. All containers in this task are granted the permissions that are specified in this role. For more information, see IAM Roles for Tasks in the Amazon Elastic Container Service Developer Guide.

Type: String

Required: No

volumes

A list of volume definitions in JSON format that containers in your task might use.

Type: Array of Volume objects

Required: No

Response Syntax


{
   "tags": [ 
      { 
         "key": "string",
         "value": "string"
      }
   ],
   "taskDefinition": { 
      "compatibilities": [ "string" ],
      "containerDefinitions": [ 
         { 
            "command": [ "string" ],
            "cpu": number,
            "dependsOn": [ 
               { 
                  "condition": "string",
                  "containerName": "string"
               }
            ],
            "disableNetworking": boolean,
            "dnsSearchDomains": [ "string" ],
            "dnsServers": [ "string" ],
            "dockerLabels": { 
               "string" : "string" 
            },
            "dockerSecurityOptions": [ "string" ],
            "entryPoint": [ "string" ],
            "environment": [ 
               { 
                  "name": "string",
                  "value": "string"
               }
            ],
            "environmentFiles": [ 
               { 
                  "type": "string",
                  "value": "string"
               }
            ],
            "essential": boolean,
            "extraHosts": [ 
               { 
                  "hostname": "string",
                  "ipAddress": "string"
               }
            ],
            "firelensConfiguration": { 
               "options": { 
                  "string" : "string" 
               },
               "type": "string"
            },
            "healthCheck": { 
               "command": [ "string" ],
               "interval": number,
               "retries": number,
               "startPeriod": number,
               "timeout": number
            },
            "hostname": "string",
            "image": "string",
            "interactive": boolean,
            "links": [ "string" ],
            "linuxParameters": { 
               "capabilities": { 
                  "add": [ "string" ],
                  "drop": [ "string" ]
               },
               "devices": [ 
                  { 
                     "containerPath": "string",
                     "hostPath": "string",
                     "permissions": [ "string" ]
                  }
               ],
               "initProcessEnabled": boolean,
               "maxSwap": number,
               "sharedMemorySize": number,
               "swappiness": number,
               "tmpfs": [ 
                  { 
                     "containerPath": "string",
                     "mountOptions": [ "string" ],
                     "size": number
                  }
               ]
            },
            "logConfiguration": { 
               "logDriver": "string",
               "options": { 
                  "string" : "string" 
               },
               "secretOptions": [ 
                  { 
                     "name": "string",
                     "valueFrom": "string"
                  }
               ]
            },
            "memory": number,
            "memoryReservation": number,
            "mountPoints": [ 
               { 
                  "containerPath": "string",
                  "readOnly": boolean,
                  "sourceVolume": "string"
               }
            ],
            "name": "string",
            "portMappings": [ 
               { 
                  "containerPort": number,
                  "hostPort": number,
                  "protocol": "string"
               }
            ],
            "privileged": boolean,
            "pseudoTerminal": boolean,
            "readonlyRootFilesystem": boolean,
            "repositoryCredentials": { 
               "credentialsParameter": "string"
            },
            "resourceRequirements": [ 
               { 
                  "type": "string",
                  "value": "string"
               }
            ],
            "secrets": [ 
               { 
                  "name": "string",
                  "valueFrom": "string"
               }
            ],
            "startTimeout": number,
            "stopTimeout": number,
            "systemControls": [ 
               { 
                  "namespace": "string",
                  "value": "string"
               }
            ],
            "ulimits": [ 
               { 
                  "hardLimit": number,
                  "name": "string",
                  "softLimit": number
               }
            ],
            "user": "string",
            "volumesFrom": [ 
               { 
                  "readOnly": boolean,
                  "sourceContainer": "string"
               }
            ],
            "workingDirectory": "string"
         }
      ],
      "cpu": "string",
      "deregisteredAt": number,
      "ephemeralStorage": { 
         "sizeInGiB": number
      },
      "executionRoleArn": "string",
      "family": "string",
      "inferenceAccelerators": [ 
         { 
            "deviceName": "string",
            "deviceType": "string"
         }
      ],
      "ipcMode": "string",
      "memory": "string",
      "networkMode": "string",
      "pidMode": "string",
      "placementConstraints": [ 
         { 
            "expression": "string",
            "type": "string"
         }
      ],
      "proxyConfiguration": { 
         "containerName": "string",
         "properties": [ 
            { 
               "name": "string",
               "value": "string"
            }
         ],
         "type": "string"
      },
      "registeredAt": number,
      "registeredBy": "string",
      "requiresAttributes": [ 
         { 
            "name": "string",
            "targetId": "string",
            "targetType": "string",
            "value": "string"
         }
      ],
      "requiresCompatibilities": [ "string" ],
      "revision": number,
      "runtimePlatform": { 
         "cpuArchitecture": "string",
         "operatingSystemFamily": "string"
      },
      "status": "string",
      "taskDefinitionArn": "string",
      "taskRoleArn": "string",
      "volumes": [ 
         { 
            "dockerVolumeConfiguration": { 
               "autoprovision": boolean,
               "driver": "string",
               "driverOpts": { 
                  "string" : "string" 
               },
               "labels": { 
                  "string" : "string" 
               },
               "scope": "string"
            },
            "efsVolumeConfiguration": { 
               "authorizationConfig": { 
                  "accessPointId": "string",
                  "iam": "string"
               },
               "fileSystemId": "string",
               "rootDirectory": "string",
               "transitEncryption": "string",
               "transitEncryptionPort": number
            },
            "fsxWindowsFileServerVolumeConfiguration": { 
               "authorizationConfig": { 
                  "credentialsParameter": "string",
                  "domain": "string"
               },
               "fileSystemId": "string",
               "rootDirectory": "string"
            },
            "host": { 
               "sourcePath": "string"
            },
            "name": "string"
         }
      ]
   }
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

tags

The list of tags associated with the task definition.

Type: Array of Tag objects

Array Members: Minimum number of 0 items. Maximum number of 50 items.

taskDefinition

The full description of the registered task definition.

Type: TaskDefinition object

Errors

For information about the errors that are common to all actions, see Common Errors.

ClientException

These errors are usually caused by a client action. This client action might be using an action or resource on behalf of a user that doesn't have permissions to use the action or resource,. Or, it might be specifying an identifier that isn't valid.

HTTP Status Code: 400

InvalidParameterException

The specified parameter isn't valid. Review the available parameters for the API request.

HTTP Status Code: 400

ServerException

These errors are usually caused by a server issue.

HTTP Status Code: 500

Examples

In the following example or examples, the Authorization header contents (AUTHPARAMS) must be replaced with an AWS Signature Version 4 signature. For more information, see Signature Version 4 Signing Process in the AWS General Reference.

You only need to learn how to sign HTTP requests if you intend to create them manually. When you use the AWS Command Line Interface or one of the AWS SDKs to make requests to AWS, these tools automatically sign the requests for you, with the access key that you specify when you configure the tools. When you use these tools, you don't have to sign requests yourself.

Example

This example request registers a task definition in the hello_world family with the host networking mode.

Sample Request


POST / HTTP/1.1
Host: ecs.us-east-1.amazonaws.com
Accept-Encoding: identity
Content-Length: 486
X-Amz-Target: AmazonEC2ContainerServiceV20141113.RegisterTaskDefinition
X-Amz-Date: 20150429T193109Z
Content-Type: application/x-amz-json-1.1
Authorization: AUTHPARAMS

{
  "networkMode": "host",
  "containerDefinitions": [
    {
      "name": "wordpress",
      "links": [
        "mysql"
      ],
      "image": "wordpress",
      "essential": true,
      "portMappings": [
        {
          "containerPort": 80,
          "hostPort": 80
        }
      ],
      "memory": 500,
      "cpu": 10
    },
    {
      "name": "mysql",
      "image": "mysql",
      "cpu": 10,
      "environment": [
        {
          "name": "MYSQL_ROOT_PASSWORD",
          "value": "password"
        }
      ],
      "memory": 500,
      "essential": true
    }
  ],
  "family": "hello_world"
}

Sample Response


HTTP/1.1 200 OK
Server: Server
Date: Fri, 12 Aug 2016 22:17:20 GMT
Content-Type: application/x-amz-json-1.1
Content-Length: 714
Connection: keep-alive
x-amzn-RequestId: 896d7e0f-60da-11e6-8e21-55c97a4b6423

{
  "taskDefinition": {
    "containerDefinitions": [
      {
        "cpu": 10,
        "environment": [],
        "essential": true,
        "image": "wordpress",
        "links": [
          "mysql"
        ],
        "memory": 500,
        "mountPoints": [],
        "name": "wordpress",
        "portMappings": [
          {
            "containerPort": 80,
            "hostPort": 80,
            "protocol": "tcp"
          }
        ],
        "volumesFrom": []
      },
      {
        "cpu": 10,
        "environment": [
          {
            "name": "MYSQL_ROOT_PASSWORD",
            "value": "password"
          }
        ],
        "essential": true,
        "image": "mysql",
        "memory": 500,
        "mountPoints": [],
        "name": "mysql",
        "portMappings": [],
        "volumesFrom": []
      }
    ],
    "family": "hello_world",
    "networkMode": "host",
    "runtimePlatform":LINUX
    "requiresAttributes": [
      {
        "name": "com.amazonaws.ecs.capability.docker-remote-api.1.18"
      }
    ],
    "revision": 4,
    "status": "ACTIVE",
    "taskDefinitionArn": "arn:aws:ecs:us-east-1:012345678910:task-definition/hello_world:4",
    "volumes": []
  }
}