Cheat Sheet #day19 - AWS Lambda Commands

AWS Lambda Commands Cheat Sheet

AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers. Below is a cheat sheet of common AWS Lambda commands using the AWS CLI (Command Line Interface).

Setup

• Configure AWS CLI

    aws configure
  

  This command will prompt you to enter your AWS Access Key, Secret Key, region, and output format.

Function Operations

• Create a Lambda Function

    aws lambda create-function \
      --function-name my-function \
      --runtime python3.8 \
      --role arn:aws:iam::123456789012:role/execution_role \
      --handler lambda_function.lambda_handler \
      --zip-file fileb://function.zip
  

• Update a Lambda Function's Code

    aws lambda update-function-code \
      --function-name my-function \
      --zip-file fileb://function.zip
  

• Update a Lambda Function's Configuration

    aws lambda update-function-configuration \
      --function-name my-function \
      --handler new_handler \
      --memory-size 256 \
      --timeout 60
  

• Delete a Lambda Function

    aws lambda delete-function \
      --function-name my-function
  

Listing and Describing Functions

• List Lambda Functions

    aws lambda list-functions
  

• Get a Lambda Function's Configuration

    aws lambda get-function-configuration \
      --function-name my-function
  

• Get a Lambda Function

    aws lambda get-function \
      --function-name my-function
  

Invoking Functions

• Invoke a Lambda Function

    aws lambda invoke \
      --function-name my-function \
      --payload '{"key1": "value1"}' \
      response.json
  

Permissions and Policies

• Add Permissions to a Lambda Function

    aws lambda add-permission \
      --function-name my-function \
      --statement-id some-id \
      --action lambda:InvokeFunction \
      --principal s3.amazonaws.com \
      --source-arn arn:aws:s3:::my-bucket
  

• Remove Permissions from a Lambda Function

    aws lambda remove-permission \
      --function-name my-function \
      --statement-id some-id
  

Environment Variables

• Update Environment Variables for a Function

    aws lambda update-function-configuration \
      --function-name my-function \
      --environment Variables={KEY1=value1,KEY2=value2}
  

Versions and Aliases

• Publish a New Version of a Lambda Function

    aws lambda publish-version \
      --function-name my-function
  

• Create an Alias for a Lambda Function Version

    aws lambda create-alias \
      --function-name my-function \
      --name my-alias \
      --function-version 1
  

• Update an Alias

    aws lambda update-alias \
      --function-name my-function \
      --name my-alias \
      --function-version 2
  

• Delete an Alias

    aws lambda delete-alias \
      --function-name my-function \
      --name my-alias
  

Event Source Mappings

• Create an Event Source Mapping

    aws lambda create-event-source-mapping \
      --function-name my-function \
      --batch-size 100 \
      --event-source-arn arn:aws:sqs:us-west-2:123456789012:my-queue
  

• Update an Event Source Mapping

    aws lambda update-event-source-mapping \
      --uuid 1234abcd-12ab-34cd-56ef-1234567890ab \
      --batch-size 200
  

• Delete an Event Source Mapping

    aws lambda delete-event-source-mapping \
      --uuid 1234abcd-12ab-34cd-56ef-1234567890ab
  

Useful Options

• Specify a Region

    aws lambda list-functions --region us-west-2
  

• Profile Option

    aws lambda list-functions --profile myprofile
  

This cheat sheet provides a quick reference to the most commonly used AWS Lambda commands. For more detailed information and additional commands, refer to the official AWS CLI documentation.