End of support notice: On October 7th, 2026, AWS will discontinue support for AWS IoT Greengrass Version 1. After October 7th, 2026, you will no longer be able to access the AWS IoT Greengrass V1 resources. For more information, please visit [Migrate from AWS IoT Greengrass Version 1](https://docs.aws.amazon.com/greengrass/v2/developerguide/migrate-from-v1.html). # /greengrass/definition/functions/FunctionDefinitionId/versions/FunctionDefinitionVersionId ## GET `GET /greengrass/definition/functions/FunctionDefinitionId/versions/FunctionDefinitionVersionId` Operation ID: [GetFunctionDefinitionVersion](getfunctiondefinitionversion-get.md) Retrieves information about a Lambda function definition version, including which Lambda functions are included in the version and their configurations. Produces: application/json ### Path Parameters [**FunctionDefinitionId**](parameters-functiondefinitionidparam.md) The ID of the function definition. where used: path; required: true type: string [**FunctionDefinitionVersionId**](parameters-functiondefinitionversionidparam.md) The ID of the function definition version. This value maps to the `Version` property of the corresponding `VersionInformation` object, which is returned by `ListFunctionDefinitionVersions` requests. If the version is the last one that was associated with a function definition, the value also maps to the `LatestVersion` property of the corresponding `DefinitionInformation` object. where used: path; required: true type: string ### Query Parameters [**NextToken**](parameters-nexttokenparam.md) The token for the next set of results, or `null` if there are no more results. where used: query; required: false type: string ### CLI ``` aws greengrass get-function-definition-version \ --function-definition-id \ --function-definition-version-id \ [--next-token ] \ [--cli-input-json ] \ [--generate-cli-skeleton] ``` cli-input-json format: ``` { "FunctionDefinitionId": "string", "FunctionDefinitionVersionId": "string", "NextToken": "string" } ``` ### Responses **200** Success. [ GetFunctionDefinitionVersionResponse](definitions-getfunctiondefinitionversionresponse.md) ``` { "Arn": "string", "Id": "string", "Version": "string", "CreationTimestamp": "string", "Definition": { "DefaultConfig": { "Execution": { "IsolationMode": "GreengrassContainer|NoContainer", "RunAs": { "Uid": 1001, "Gid": 1002 } } }, "Functions": [ { "Id": "string", "FunctionArn": "string", "FunctionConfiguration": { "Pinned": true, "Executable": "string", "ExecArgs": "string", "MemorySize": 0, "Timeout": 0, "EncodingType": "binary|json", "Environment": { "Variables": { "additionalProperty0": "string", "additionalProperty1": "string", "additionalProperty2": "string" }, "ResourceAccessPolicies": [ { "ResourceId": "string", "Permission": "ro|rw" } ], "AccessSysfs": true, "Execution": { "IsolationMode": "GreengrassContainer|NoContainer", "RunAs": { "Uid": 1001, "Gid": 1002 } } }, "FunctionRuntimeOverride": "string" } } ] }, "NextToken": "string" } ``` GetFunctionDefinitionVersionResponse Information about a function definition version. type: object Arn The ARN of the function definition version. type: string Id The ID of the function definition version. type: string Version The version of the function definition version. type: string CreationTimestamp The time, in milliseconds since the epoch, when the function definition version was created. type: string Definition Information about a function definition version. type: object DefaultConfig The default configuration that applies to all Lambda functions in the group. Individual Lambda functions can override these settings. type: object Execution Configuration information that specifies how a Lambda function runs. Functions A list of Lambda functions in this function definition version. type: array items: [Function](definitions-function.md) Information about a Lambda function. type: object required: ["Id"] Id A descriptive or arbitrary ID for the function. This value must be unique within the function definition version. Maximum length is 128 characters with the pattern `[a‑zA‑Z0‑9:_‑]+`. type: string FunctionArn The ARN of the alias (recommended) or version of the target Lambda function. type: string FunctionConfiguration The configuration of the Lambda function. type: object Pinned True if the function is pinned. Pinned means the function is long-lived and starts when the core starts. type: boolean Executable The name of the function executable. type: string ExecArgs The execution arguments. type: string MemorySize The memory size, in KB, required by the function. This setting does not apply and should be cleared when you run the Lambda function without containerization. type: integer Timeout The allowed function execution time, after which Lambda should terminate the function. This timeout still applies to pinned Lambda functions for each request. type: integer EncodingType The expected encoding type of the input payload for the function. The default is `json`. type: string enum: ["binary", "json"] Environment The environment configuration of the function. type: object Variables Environment variables for the Lambda function's configuration. type: object additionalProperties: An object with properties of type `string` that represent the environment variables. ResourceAccessPolicies A list of the resources, with their permissions, to which the Lambda function is granted access. A Lambda function can have at most 10 resources. ResourceAccessPolicies applies only when you run the Lambda function in a Greengrass container. type: array items: [ResourceAccessPolicy](definitions-resourceaccesspolicy.md) ResourceAccessPolicy A policy used by the function to access a resource. type: object required: ["ResourceId"] ResourceId The ID of the resource. (This ID is assigned to the resource when you create the resource definiton.) type: string Permission The type of permission a function has to access a resource. type: string enum: ["ro", "rw"] AccessSysfs If true, the Lambda function is allowed to access the host's /sys folder. Use this when the Lambda function needs to read device information from /sys. This setting applies only when you run the Lambda function in a Greengrass container. type: boolean Execution Configuration information that specifies how a Lambda function runs. type: object IsolationMode Specifies whether the Lambda function runs in a Greengrass container (default) or without containerization. Unless your scenario requires that you run without containerization, we recommend that you run in a Greengrass container. Omit this value to run the Lambda function with the default containerization for the group. type: string enum: ["GreengrassContainer", "NoContainer"] RunAs Specifies the user and group whose permissions are used when running the Lambda function. You can specify one or both values to override the default values. To minimize the risk of unintended changes or malicious attacks, we recommend that you avoid running as root unless absolutely necessary. To run as root, you must update config.json in `greengrass-root/config` to set `allowFunctionsToRunAsRoot` to `yes`. type: object Uid The user ID whose permissions are used to run a Lambda function. type: integer Gid The group ID whose permissions are used to run a Lambda function. type: integer FunctionRuntimeOverride The Lambda runtime supported by Greengrass which is to be used instead of the one specified in the Lambda function. type: string NextToken The token for the next set of results, or `null` if there are no more results. type: string **400** Invalid request. [ GeneralError](definitions-generalerror.md) ``` { "Message": "string", "ErrorDetails": [ { "DetailedErrorCode": "string", "DetailedErrorMessage": "string" } ] } ``` GeneralError General error information. type: object required: ["Message"] Message A message that contains information about the error. type: string ErrorDetails A list of error details. type: array items: [ErrorDetail](definitions-errordetail.md) ErrorDetail Details about the error. type: object DetailedErrorCode A detailed error code. type: string DetailedErrorMessage A detailed error message. type: string