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[ aws . lambda ]



Creates a Lambda function. To create a function, you need a deployment package and an execution role . The deployment package contains your function code. The execution role grants the function permission to use AWS services, such as Amazon CloudWatch Logs for log streaming and AWS X-Ray for request tracing.

When you create a function, Lambda provisions an instance of the function and its supporting resources. If your function connects to a VPC, this process can take a minute or so. During this time, you can't invoke or modify the function. The State , StateReason , and StateReasonCode fields in the response from GetFunctionConfiguration indicate when the function is ready to invoke. For more information, see Function States .

A function has an unpublished version, and can have published versions and aliases. The unpublished version changes when you update your function's code and configuration. A published version is a snapshot of your function code and configuration that can't be changed. An alias is a named resource that maps to a version, and can be changed to map to a different version. Use the Publish parameter to create version 1 of your function from its initial configuration.

The other parameters let you configure version-specific and function-level settings. You can modify version-specific settings later with UpdateFunctionConfiguration . Function-level settings apply to both the unpublished and published versions of the function, and include tags ( TagResource ) and per-function concurrency limits ( PutFunctionConcurrency ).

If another account or an AWS service invokes your function, use AddPermission to grant permission by creating a resource-based IAM policy. You can grant permissions at the function level, on a version, or on an alias.

To invoke your function directly, use Invoke . To invoke your function in response to events in other AWS services, create an event source mapping ( CreateEventSourceMapping ), or configure a function trigger in the other service. For more information, see Invoking Functions .

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.


--function-name <value>
--runtime <value>
--role <value>
--handler <value>
[--code <value>]
[--description <value>]
[--timeout <value>]
[--memory-size <value>]
[--publish | --no-publish]
[--vpc-config <value>]
[--dead-letter-config <value>]
[--environment <value>]
[--kms-key-arn <value>]
[--tracing-config <value>]
[--tags <value>]
[--layers <value>]
[--file-system-configs <value>]
[--zip-file <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]


--function-name (string)

The name of the Lambda function.

Name formats
  • Function name - my-function .
  • Function ARN - arn:aws:lambda:us-west-2:123456789012:function:my-function .
  • Partial ARN - 123456789012:function:my-function .

The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

--runtime (string)

The identifier of the function's runtime .

Possible values:

  • nodejs
  • nodejs4.3
  • nodejs6.10
  • nodejs8.10
  • nodejs10.x
  • nodejs12.x
  • java8
  • java11
  • python2.7
  • python3.6
  • python3.7
  • python3.8
  • dotnetcore1.0
  • dotnetcore2.0
  • dotnetcore2.1
  • dotnetcore3.1
  • nodejs4.3-edge
  • go1.x
  • ruby2.5
  • ruby2.7
  • provided

--role (string)

The Amazon Resource Name (ARN) of the function's execution role.

--handler (string)

The name of the method within your code that Lambda calls to execute your function. The format includes the file name. It can also include namespaces and other qualifiers, depending on the runtime. For more information, see Programming Model .

--code (structure)

The code for the function.

Shorthand Syntax:


JSON Syntax:

  "S3Bucket": "string",
  "S3Key": "string",
  "S3ObjectVersion": "string"

--description (string)

A description of the function.

--timeout (integer)

The amount of time that Lambda allows a function to run before stopping it. The default is 3 seconds. The maximum allowed value is 900 seconds.

--memory-size (integer)

The amount of memory that your function has access to. Increasing the function's memory also increases its CPU allocation. The default value is 128 MB. The value must be a multiple of 64 MB.

--publish | --no-publish (boolean)

Set to true to publish the first version of the function during creation.

--vpc-config (structure)

For network connectivity to AWS resources in a VPC, specify a list of security groups and subnets in the VPC. When you connect a function to a VPC, it can only access resources and the internet through that VPC. For more information, see VPC Settings .

Shorthand Syntax:


JSON Syntax:

  "SubnetIds": ["string", ...],
  "SecurityGroupIds": ["string", ...]

--dead-letter-config (structure)

A dead letter queue configuration that specifies the queue or topic where Lambda sends asynchronous events when they fail processing. For more information, see Dead Letter Queues .

Shorthand Syntax:


JSON Syntax:

  "TargetArn": "string"

--environment (structure)

Environment variables that are accessible from function code during execution.

Shorthand Syntax:


JSON Syntax:

  "Variables": {"string": "string"

--kms-key-arn (string)

The ARN of the AWS Key Management Service (AWS KMS) key that's used to encrypt your function's environment variables. If it's not provided, AWS Lambda uses a default service key.

--tracing-config (structure)

Set Mode to Active to sample and trace a subset of incoming requests with AWS X-Ray.

Shorthand Syntax:


JSON Syntax:

  "Mode": "Active"|"PassThrough"

--tags (map)

A list of tags to apply to the function.

Shorthand Syntax:


JSON Syntax:

{"string": "string"

--layers (list)

A list of function layers to add to the function's execution environment. Specify each layer by its ARN, including the version.


"string" "string" ...

--file-system-configs (list)

Connection settings for an Amazon EFS file system.

Shorthand Syntax:

Arn=string,LocalMountPath=string ...

JSON Syntax:

    "Arn": "string",
    "LocalMountPath": "string"

--zip-file (blob)

The path to the zip file of the code you are uploading. Specify --zip-file or --code, but not both. Example: fileb://

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See 'aws help' for descriptions of global parameters.


To create a Lambda function

The following create-function example creates a Lambda function named my-function.

aws lambda create-function \
    --function-name my-function \
    --runtime nodejs10.x \
    --zip-file fileb:// \
    --handler my-function.handler \
    --role arn:aws:iam::123456789012:role/service-role/MyTestFunction-role-tges6bf4

Contents of This file is a deployment package that contains your function code and any dependencies.


    "TracingConfig": {
        "Mode": "PassThrough"
    "CodeSha256": "PFn4S+er27qk+UuZSTKEQfNKG/XNn7QJs90mJgq6oH8=",
    "FunctionName": "my-function",
    "CodeSize": 308,
    "RevisionId": "873282ed-4cd3-4dc8-a069-d0c647e470c6",
    "MemorySize": 128,
    "FunctionArn": "arn:aws:lambda:us-west-2:123456789012:function:my-function",
    "Version": "$LATEST",
    "Role": "arn:aws:iam::123456789012:role/service-role/MyTestFunction-role-zgur6bf4",
    "Timeout": 3,
    "LastModified": "2019-08-14T22:26:11.234+0000",
    "Handler": "my-function.handler",
    "Runtime": "nodejs10.x",
    "Description": ""

For more information, see AWS Lambda Function Configuration in the AWS Lambda Developer Guide.


FunctionName -> (string)

The name of the function.

FunctionArn -> (string)

The function's Amazon Resource Name (ARN).

Runtime -> (string)

The runtime environment for the Lambda function.

Role -> (string)

The function's execution role.

Handler -> (string)

The function that Lambda calls to begin executing your function.

CodeSize -> (long)

The size of the function's deployment package, in bytes.

Description -> (string)

The function's description.

Timeout -> (integer)

The amount of time in seconds that Lambda allows a function to run before stopping it.

MemorySize -> (integer)

The memory that's allocated to the function.

LastModified -> (string)

The date and time that the function was last updated, in ISO-8601 format (YYYY-MM-DDThh:mm:ss.sTZD).

CodeSha256 -> (string)

The SHA256 hash of the function's deployment package.

Version -> (string)

The version of the Lambda function.

VpcConfig -> (structure)

The function's networking configuration.

SubnetIds -> (list)

A list of VPC subnet IDs.


SecurityGroupIds -> (list)

A list of VPC security groups IDs.


VpcId -> (string)

The ID of the VPC.

DeadLetterConfig -> (structure)

The function's dead letter queue.

TargetArn -> (string)

The Amazon Resource Name (ARN) of an Amazon SQS queue or Amazon SNS topic.

Environment -> (structure)

The function's environment variables.

Variables -> (map)

Environment variable key-value pairs.

key -> (string)

value -> (string)

Error -> (structure)

Error messages for environment variables that couldn't be applied.

ErrorCode -> (string)

The error code.

Message -> (string)

The error message.

KMSKeyArn -> (string)

The KMS key that's used to encrypt the function's environment variables. This key is only returned if you've configured a customer managed CMK.

TracingConfig -> (structure)

The function's AWS X-Ray tracing configuration.

Mode -> (string)

The tracing mode.

MasterArn -> (string)

For Lambda@Edge functions, the ARN of the master function.

RevisionId -> (string)

The latest updated revision of the function or alias.

Layers -> (list)

The function's layers .


An AWS Lambda layer .

Arn -> (string)

The Amazon Resource Name (ARN) of the function layer.

CodeSize -> (long)

The size of the layer archive in bytes.

State -> (string)

The current state of the function. When the state is Inactive , you can reactivate the function by invoking it.

StateReason -> (string)

The reason for the function's current state.

StateReasonCode -> (string)

The reason code for the function's current state. When the code is Creating , you can't invoke or modify the function.

LastUpdateStatus -> (string)

The status of the last update that was performed on the function. This is first set to Successful after function creation completes.

LastUpdateStatusReason -> (string)

The reason for the last update that was performed on the function.

LastUpdateStatusReasonCode -> (string)

The reason code for the last update that was performed on the function.

FileSystemConfigs -> (list)

Connection settings for an Amazon EFS file system.


Details about the connection between a Lambda function and an Amazon EFS file system.

Arn -> (string)

The Amazon Resource Name (ARN) of the Amazon EFS access point that provides access to the file system.

LocalMountPath -> (string)

The path where the function can access the file system, starting with /mnt/ .