Skip to content

ql4b/terraform-aws-lambda-function

BranchesTags

Repository files navigation

terraform-aws-lambda-function

Minimal Lambda function with zip packaging and container image support for provided.al2023 runtime

Terraform module that creates a Lambda function with zip packaging or container images, IAM execution role, and CloudWatch logs. Perfect for shell scripts and custom runtimes.

Features

  • Zip packaging from source directory
  • Container image deployment from ECR
  • IAM execution role with basic Lambda permissions
  • CloudWatch log group with configurable retention
  • provided.al2023 runtime optimized for shell scripts
  • CloudPosse labeling for consistent naming

Usage

Basic Usage with Zip Packaging

module "lambda" {
  source  = "ql4b/lambda-function/aws"
  version = "~> 1.0"
  
  source_dir       = "../app/src"
  template_dir     = "../app/src"
  create_templates = true
  
  context    = module.label.context
  attributes = ["lambda"]
}

This will automatically create bootstrap, handler.sh, and Makefile in your ../app/src directory.

Container Image Usage

module "lambda_function" {
  source  = "ql4b/lambda-function/aws"
  version = "~> 1.0"
  
  package_type = "Image"
  image_uri    = "${aws_ecr_repository.example.repository_url}:latest"
  
  image_config = {
    entry_point = ["/lambda-entrypoint.sh"]
    command     = ["app.handler"]
  }
  
  memory_size = 512
  timeout     = 30
  
  environment_variables = {
    THUMBNAILS_BUCKET = module.thumbnails_bucket.bucket_id
  }
  
  context    = module.label.context
  attributes = ["lambda"]
}

Note: This module integrates seamlessly with any existing Terraform setup. The examples above show integration with CloudPosse labeling, but you can use it standalone or with any naming convention.

Advanced Zip Configuration

module "lambda_function" {
  source  = "ql4b/lambda-function/aws"
  version = "~> 1.0"
  
  package_type = "Zip"
  source_dir   = "./src"
  
  handler            = "bootstrap"
  runtime            = "provided.al2023"
  architecture       = "arm64"
  memory_size        = 256
  timeout            = 30
  
  environment_variables = {
    HANDLER = "/var/task/handler.sh"
    PATH    = "/opt/bin:/usr/local/bin:/usr/bin:/bin"
  }
  
  log_retention_days = 30
  
  context = {
    namespace = "myorg"
    name      = "myfunction"
    stage     = "prod"
  }
}

Variables

Name Description Type Default Required
package_type Lambda deployment package type string "Zip" no
image_uri ECR image URI for container image deployment string null no
image_config Container image configuration object null no
source_dir Path to source directory (Zip only) string n/a yes
handler Lambda function handler (Zip only) string "bootstrap" no
runtime Lambda runtime (Zip only) string "provided.al2023" no
architecture Lambda function architecture string "arm64" no
memory_size Memory in MB number 128 no
timeout Timeout in seconds number 3 no
environment_variables Environment variables map(string) {} no

Container Image Configuration

The image_config object supports:

image_config = {
  entry_point       = ["/lambda-entrypoint.sh"]  # Optional
  command          = ["app.handler"]              # Optional  
  working_directory = "/var/task"                 # Optional
}

Template Generation (Zip Only)

Set create_templates = true to automatically generate starter files:

  • bootstrap - Lambda runtime bootstrap (executable)
  • handler.sh - Example function handler
  • Makefile - Deployment and testing commands

Generated Directory Structure

src/
├── bootstrap      # Lambda runtime bootstrap (executable)
├── handler.sh     # Your function code
└── Makefile       # Deployment commands

Example Bootstrap

#!/bin/bash
# bootstrap
set -euo pipefail

while true; do
  HEADERS="$(mktemp)"
  EVENT_DATA=$(curl -sS -LD "$HEADERS" -X GET "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/next")
  REQUEST_ID=$(grep -Fi Lambda-Runtime-Aws-Request-Id "$HEADERS" | tr -d '[:space:]' | cut -d: -f2)
  
  # Execute your handler
  RESPONSE=$(bash "${HANDLER:-/var/task/handler.sh}" "$EVENT_DATA")
  
  # Send response
  curl -X POST "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/$REQUEST_ID/response" -d "$RESPONSE"
done

Example Handler

#!/bin/bash
# handler.sh
api_handler() {
    local event="$1"
    local name=$(echo "$event" | jq -r '.name // "World"')
    
    echo '{
        "statusCode": 200,
        "body": "Hello, '"$name"'!"
    }'
}

# Call handler with event data
api_handler "$1"

Deployment Workflow

1. Deploy Infrastructure

terraform init
terraform apply

2. Set Function Name

# If using the module directly
export FUNCTION_NAME=$(terraform output -raw function_name)

# If using as a nested module (like in cloudless-minimal)
export FUNCTION_NAME=$(tf output --json lambda | jq -r .function_name)

3. Use the Generated Makefile (Zip Only)

When create_templates = true, a Makefile is generated with deployment workflows:

# Set function name (adjust based on your output structure)
export FUNCTION_NAME=$(tf output --json lambda | jq -r .function_name)

# Navigate to your source directory
cd app/src

# Deploy function code
make deploy

# Test function
make invoke

# View logs
make logs

# Clean artifacts
make clean

# See all targets
make help

4. Manual Deployment (Alternative)

# Package and deploy manually
FUNCTION_NAME=$(terraform output -raw function_name)
cd src && zip -r ../function.zip .
aws lambda update-function-code \
  --function-name $FUNCTION_NAME \
  --zip-file fileb://function.zip

# Test function
aws lambda invoke --function-name $FUNCTION_NAME /tmp/response.json
cat /tmp/response.json

Requirements

  • Terraform >= 1.0
  • AWS provider >= 5.0
  • Archive provider >= 2.0 (Zip packaging only)

Outputs

  • function_name - Lambda function name
  • function_arn - Lambda function ARN
  • execution_role_arn - IAM execution role ARN
  • execution_role_name - IAM execution role name
  • log_group_name - CloudWatch log group name

Integration with Lambda Layers

# Add layers for additional tools
resource "aws_lambda_layer_version" "jq" {
  layer_name = "jq"
  filename   = "jq-layer.zip"
  
  compatible_runtimes      = ["provided.al2023"]
  compatible_architectures = ["arm64"]
}

module "lambda_function" {
  source  = "ql4b/lambda-function/aws"
  version = "~> 1.0"
  
  source_dir = "./src"
  
  environment_variables = {
    PATH = "/opt/bin:/usr/local/bin:/usr/bin:/bin"
  }
  
  context = {
    namespace = "myorg"
    name      = "myfunction"
  }
}

# Attach layer to function
resource "aws_lambda_function" "with_layers" {
  # ... other configuration
  layers = [aws_lambda_layer_version.jq.arn]
}

Requirements

Name Version
terraform >= 1.0
archive >= 2.0
aws >= 5.0

Providers

Name Version
archive >= 2.0
aws >= 5.0
null n/a

Modules

Name Source Version
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_cloudwatch_log_group.lambda_logs resource
aws_iam_role.lambda_execution resource
aws_iam_role_policy_attachment.lambda_basic_execution resource
aws_lambda_function.this resource
aws_ssm_parameter.function_arn resource
aws_ssm_parameter.function_name resource
aws_ssm_parameter.invoke_arn resource
null_resource.bootstrap_template resource
null_resource.handler_template resource
null_resource.makefile_template resource
archive_file.lambda_zip 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
architecture Lambda function architecture string "arm64" 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
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
create_templates Create template files (bootstrap, handler, Makefile) in template_dir bool false no
delimiter Delimiter to be used between ID elements.
Defaults to - (hyphen). Set to "" to use no delimiter at all.		 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
environment_variables Map of environment variables for the Lambda function map(string) {} no
filename Path to pre-built zip file (alternative to source_dir) string null no
handler Lambda function handler string "bootstrap" 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 Container image configuration 
object({
    entry_point = optional(list(string))
    command     = optional(list(string))
    working_directory = optional(string)
  })
 null no
image_uri ECR image URI for container image deployment string null 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
layers List of Lambda layer ARNs to attach to the function list(string) [] no
log_retention_days CloudWatch log retention in days number 14 no
memory_size Amount of memory in MB your 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 Lambda deployment package type string "Zip" 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
runtime Lambda runtime string "provided.al2023" no
source_dir Path to the source directory containing Lambda function code 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
template_dir Directory to create template files in string "./src" 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 Amount of time your Lambda Function has to run in seconds number 3 no

Outputs

Name Description
execution_role_arn Lambda execution role ARN
execution_role_name Lambda execution role name
function_arn Lambda function ARN
function_invoke_arn Lambda function invoke ARN
function_last_modified Lambda function last modified date
function_name Lambda function name
function_qualified_arn Lambda function qualified ARN
function_source_code_hash Lambda function source code hash
function_source_code_size Lambda function source code size
function_version Lambda function version
log_group_arn CloudWatch log group ARN
log_group_name CloudWatch log group name
package_path Path to the Lambda deployment package
package_size Size of the Lambda deployment package
ssm_parameters SSM parameter names for Serverless integration
template_files Paths to created template files

Part of the cloudless ecosystem.

About

Minimal Lambda function with zip packaging for provided.al2023 runtime

registry.terraform.io/modules/ql4b/lambda-function/aws

Topics

aws-lambda terraform terraform-module aws-terraform-module

Resources

Readme

License

Apache-2.0 license
Activity
Custom properties

Stars

0 stars

Watchers

0 watching

Forks

0 forks
Report repository

Releases 4

v1.2.0 Latest
Jun 15, 2026
+ 3 releases

Packages

 
 
 

Contributors

Languages