This module deploys an AWS Lambda function from a Zip file or from a Docker image. Additionally, it creates an IAM role for the Lambda function, which optionally attaches policies to allow for CloudWatch Logs, Cloudwatch Insights, VPC Access and X-Ray tracing.

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Usage

For a complete example, see examples/complete. For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

module "lambda" {
  source  = "cloudposse/lambda-function/aws"
  version = "xxxx"

  filename      = "lambda.zip"
  function_name = "my-function"
  handler       = "handler.handler"
  runtime       = "nodejs14.x"
}

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Examples

• examples/complete - complete example of using this module
• examples/docker-image - example of using Lambda with Docker images

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Requirements

Name	Version
terraform	>= 0.14
aws	>= 3.0

Providers

Name	Version
aws	>= 3.0

Modules

Name	Source	Version
cloudwatch_log_group	cloudposse/cloudwatch-logs/aws	0.6.6
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_iam_policy.ssm	resource
aws_iam_role.this	resource
aws_iam_role_policy.inline	resource
aws_iam_role_policy_attachment.cloudwatch_insights	resource
aws_iam_role_policy_attachment.cloudwatch_logs	resource
aws_iam_role_policy_attachment.custom	resource
aws_iam_role_policy_attachment.ssm	resource
aws_iam_role_policy_attachment.vpc_access	resource
aws_iam_role_policy_attachment.xray	resource
aws_lambda_function.this	resource
aws_lambda_permission.invoke_function	resource
aws_caller_identity.this	data source
aws_iam_policy_document.assume_role_policy	data source
aws_iam_policy_document.ssm	data source
aws_partition.this	data source
aws_region.this	data source

Inputs

Name	Description	Type	Default	Required
additional_tag_map	Additional key-value pairs to add to each map in tags_as_list_of_maps. Not added to tags or id. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	map(string)	{}	no
architectures	Instruction set architecture for your Lambda function. Valid values are ["x86_64"] and ["arm64"]. Default is ["x86_64"]. Removing this attribute, function's architecture stay the same.	list(string)	null	no
attributes	ID element. Additional attributes (e.g. workers or cluster) to add to id, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the delimiter and treated as a single ID element.	list(string)	[]	no
cloudwatch_lambda_insights_enabled	Enable CloudWatch Lambda Insights for the Lambda Function.	bool	false	no
cloudwatch_logs_kms_key_arn	The ARN of the KMS Key to use when encrypting log data.	string	null	no
cloudwatch_logs_retention_in_days	Specifies the number of days you want to retain log events in the specified log group. Possible values are: 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, 3653, and 0. If you select 0, the events in the log group are always retained and never expire.	number	null	no
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as null to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	any	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
custom_iam_policy_arns	ARNs of custom policies to be attached to the lambda role	set(string)	[]	no
dead_letter_config_target_arn	ARN of an SNS topic or SQS queue to notify when an invocation fails. If this option is used, the function's IAM role must be granted suitable access to write to the target object, which means allowing either the sns:Publish or sqs:SendMessage action on this ARN, depending on which service is targeted."	string	null	no
delimiter	Delimiter to be used between ID elements. Defaults to - (hyphen). Set to "" to use no delimiter at all.	string	null	no
description	Description of what the Lambda Function does.	string	null	no
descriptor_formats	Describe additional descriptors to be output in the descriptors output map. Map of maps. Keys are names of descriptors. Values are maps of the form {<br/> format = string<br/> labels = list(string)<br/>} (Type is any so the map values can later be enhanced to provide additional options.) format is a Terraform format string to be passed to the format() function. labels is a list of labels, in order, to pass to format() function. Label values will be normalized before being passed to format() so they will be identical to how they appear in id. Default is {} (descriptors output will be empty).	any	{}	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
ephemeral_storage_size	The size of the Lambda function Ephemeral storage (/tmp) represented in MB. The minimum supported ephemeral_storage value defaults to 512MB and the maximum supported value is 10240MB.	number	null	no
filename	The path to the function's deployment package within the local filesystem. If defined, The s3_-prefixed options and image_uri cannot be used.	string	null	no
function_name	Unique name for the Lambda Function.	string	n/a	yes
handler	The function entrypoint in your code.	string	null	no
iam_policy_description	Description of the IAM policy for the Lambda IAM role	string	"Provides minimum SSM read permissions."	no
id_length_limit	Limit id to this many characters (minimum 6). Set to 0 for unlimited length. Set to null for keep the existing setting, which defaults to 0. Does not affect id_full.	number	null	no
image_config	The Lambda OCI image configurations block with three (optional) arguments: - entry_point - The ENTRYPOINT for the docker image (type list(string)). - command - The CMD for the docker image (type list(string)). - working_directory - The working directory for the docker image (type string).	any	{}	no
image_uri	The ECR image URI containing the function's deployment package. Conflicts with filename, s3_bucket, s3_key, and s3_object_version.	string	null	no
inline_iam_policy	Inline policy document (JSON) to attach to the lambda role	string	null	no
invoke_function_permissions	Defines which external source(s) can invoke this function (action 'lambda:InvokeFunction'). Attributes map to those of https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lambda_permission. NOTE: to keep things simple, we only expose a subset of said attributes. If a more complex configuration is needed, declare the necessary lambda permissions outside of this module	list(object({ principal = string source_arn = string }))	[]	no
kms_key_arn	Amazon Resource Name (ARN) of the AWS Key Management Service (KMS) key that is used to encrypt environment variables. If this configuration is not provided when environment variables are in use, AWS Lambda uses a default service key. If this configuration is provided when environment variables are not in use, the AWS Lambda API does not save this configuration and Terraform will show a perpetual difference of adding the key. To fix the perpetual difference, remove this configuration.	string	""	no
label_key_case	Controls the letter case of the tags keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the tags input. Possible values: lower, title, upper. Default value: title.	string	null	no
label_order	The order in which the labels (ID elements) appear in the id. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	list(string)	null	no
label_value_case	Controls the letter case of ID elements (labels) as included in id, set as tag values, and output by this module individually. Does not affect values of tags passed in via the tags input. Possible values: lower, title, upper and none (no transformation). Set this to title and set delimiter to "" to yield Pascal Case IDs. Default value: lower.	string	null	no
labels_as_tags	Set of labels (ID elements) to include as tags in the tags output. Default is to include all labels. Tags with empty values will not be included in the tags output. Set to [] to suppress all generated tags. Notes: The value of the name tag, if included, will be the id, not the name. Unlike other null-label inputs, the initial setting of labels_as_tags cannot be changed in later chained modules. Attempts to change it will be silently ignored.	set(string)	[ "default" ]	no
lambda_at_edge_enabled	Enable Lambda@Edge for your Node.js or Python functions. The required trust relationship and publishing of function versions will be configured in this module.	bool	false	no
lambda_environment	Environment (e.g. env variables) configuration for the Lambda function enable you to dynamically pass settings to your function code and libraries.	object({ variables = map(string) })	null	no
layers	List of Lambda Layer Version ARNs (maximum of 5) to attach to the Lambda Function.	list(string)	[]	no
memory_size	Amount of memory in MB the Lambda Function can use at runtime.	number	128	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a tag. The "name" tag is set to the full id string. There is no tag with the value of the name input.	string	null	no
namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	string	null	no
package_type	The Lambda deployment package type. Valid values are Zip and Image.	string	"Zip"	no
permissions_boundary	ARN of the policy that is used to set the permissions boundary for the role	string	""	no
publish	Whether to publish creation/change as new Lambda Function Version.	bool	false	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, "/[^a-zA-Z0-9-]/" is used to remove all characters other than hyphens, letters and digits.	string	null	no
reserved_concurrent_executions	The amount of reserved concurrent executions for this lambda function. A value of 0 disables lambda from being triggered and -1 removes any concurrency limitations.	number	-1	no
role_name	The rolename used for the Lambda Function. If not provided, a default role name will be used.	string	null	no
runtime	The runtime environment for the Lambda function you are uploading.	string	null	no
s3_bucket	The S3 bucket location containing the function's deployment package. Conflicts with filename and image_uri. This bucket must reside in the same AWS region where you are creating the Lambda function.	string	null	no
s3_key	The S3 key of an object containing the function's deployment package. Conflicts with filename and image_uri.	string	null	no
s3_object_version	The object version containing the function's deployment package. Conflicts with filename and image_uri.	string	null	no
source_code_hash	Used to trigger updates. Must be set to a base64-encoded SHA256 hash of the package file specified with either filename or s3_key. The usual way to set this is filebase64sha256('file.zip') where 'file.zip' is the local filename of the lambda function source archive.	string	""	no
ssm_parameter_names	List of AWS Systems Manager Parameter Store parameter names. The IAM role of this Lambda function will be enhanced with read permissions for those parameters. Parameters must start with a forward slash and can be encrypted with the default KMS key.	list(string)	null	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
tags	Additional tags (e.g. {'BusinessUnit': 'XYZ'}). Neither the tag keys nor the tag values will be modified by this module.	map(string)	{}	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	string	null	no
timeout	The amount of time the Lambda Function has to run in seconds.	number	3	no
tracing_config_mode	Tracing config mode of the Lambda function. Can be either PassThrough or Active.	string	null	no
vpc_config	Provide this to allow your function to access your VPC (if both 'subnet_ids' and 'security_group_ids' are empty then vpc_config is considered to be empty or unset, see https://docs.aws.amazon.com/lambda/latest/dg/vpc.html for details).	object({ security_group_ids = list(string) subnet_ids = list(string) })	null	no

Outputs

Name	Description
arn	ARN of the lambda function
cloudwatch_log_group_name	Name of Cloudwatch log group
function_name	Lambda function name
invoke_arn	Invoke ARN of the lambda function
qualified_arn	ARN identifying your Lambda Function Version (if versioning is enabled via publish = true)
role_arn	Lambda IAM role ARN
role_name	Lambda IAM role name

Related Projects

Check out these related projects.

• terraform-null-label - Terraform module designed to generate consistent names and tags for resources. Use terraform-null-label to implement a strict naming convention.

References

For additional context, refer to some of these links.

• Cloud Posse Documentation - The Cloud Posse Developer Hub (documentation)
• Terraform Standard Module Structure - HashiCorp's standard module structure is a file and directory layout we recommend for reusable modules distributed in separate repositories.
• Terraform Module Requirements - HashiCorp's guidance on all the requirements for publishing a module. Meeting the requirements for publishing a module is extremely easy.
• Terraform Version Pinning - The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration

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Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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