AWS Lambda Cheatsheet

This cheatsheet is probably based on Python

Runtime Versions
Type	Versions
Node.js	v6.4.2 and v6.10.3
Java	Java 8
Python	v2.7 and v3.6
.NET Core	.NET Core 1.0.1 (C#)

Available library for Python Execution Envionment
AWS SDK for Python 2.7 (Boto 3) version 3-1.4.7 botocore-1.7.2
AWS SDK for Python 3.6 (Boto 3) version 3-1.4.7 botocore-1.7.2

Settings \| Limits
Writable Path & Space	/tmp/ 512 MB
Default Memory & Execution Time	128 MB Memory 3 Second Timeout
Max Memory & Execution Time	1536 MB Memory 5 Minutes Timeout
Number of processes and threads (Total)	1024

Execution Role (Common Execution Role Available)
AWSLambdaBasicExecutionRole	Grants permissions only for the Amazon CloudWatch Logs actions to write logs.
AWSLambdaKinesisExecutionRole	Grants permissions for Amazon Kinesis Streams actions, and CloudWatch Logs actions.
AWSLambdaDynamoDBExecutionRole	Grants permissions for DynamoDB streams actions and CloudWatch Logs actions.
AWSLambdaVPCAccessExecutionRole	Grants permissions for Amazon Elastic Compute Cloud (Amazon EC2) actions to manage elastic network interfaces (ENIs).

Add new permission

import boto3
client = boto3.client('lambda')

# Role ARN can be found on the top right corner of the Lambda function
response = client.add_permission(
    FunctionName='string',
    StatementId='string',
    Action='string',
    Principal='string',
    SourceArn='string',
    SourceAccount='string',
    EventSourceToken='string',
    Qualifier='string'
)

Execution \| Invoke \| Tweaks
A Lambda can invoke another Lambda	Yes
A Lambda in one region can invoke another lambda in other region	Yes
A Lambda can invoke same Lambda	Yes
Exceed 5 minutes execution time	Yes (Can Tweak around)
How to exceed 5 minutes execution time	Self-Invoke , SNS, SQS
Asynchronous Execution	Yes (Async Exec)
Invoke same Lamba with different version	Yes
Invoke Request Max Payload Size (RequestResponse/synrchronous invocation)	6 MB
Invoke Request Max Payload Size (Event/asynchronous invocation)	128 KB

Setting Lambda Invoke Max Retry attempt to 0

import boto3, botocore
config = botocore.config.Config(connect_timeout=300, read_timeout=300)
invokeLam = boto3.client('lambda', region_name='us-east-1', config=config)
invokeLam.meta.events._unique_id_handlers['retry-config-lambda']['handler']._checker.__dict__['_max_attempts'] = 0

Triggers	Description	Requirement
API Gateway	Trigger AWS Lambda function over HTTPS	API Endpoint name API Endpoint Deployment Stage Security Role
AWS IoT	Trigger AWS Lambda for performing specific action by mapping your AWS IoT Dash Button (Cloud Programmable Dash Button)	DSN (Device Serial Number)
Alexa Skill Kit	Trigger AWS Lambda to build services that give new skills to Alexa	--
Alexa Smart Home	Trigger AWS Lambda with desired skill	Application ID (Skill)
CloudWatch Events	Trigger AWS Lambda on desired time interval (rate(1 day)) or on the state change of EC2, RDS, S3, Health.	Rule based on either Event Pattern (time interval) Schedule Expression (Auto Scaling on events like Instance launch and terminate AWS API call via CloudTrail
CloudWatch Logs	Trigger AWS Lambda based on the CloudWatch Logs	Log Group Name
Code Commit	Trigger AWS Lambda based on the AWS CodeCommit version control system	Repository Name Event Type
Cognito Sync Trigger	Trigger AWS Lambda in response to event, each time the dataset is synchronized	Cognito Identity Pool dataset
DynamoDB	Trigger AWS Lambda whenever the DynomoDB table is updated	DynamoDB Table name Batch Size(The largest number of records that AWS Lambda will retrieve from your table at the time of invoking your function. Your function receives an event with all the retrieved records)
Kinesis	Trigger AWS Lambda whenever the Kinesis stream is updated	Kinesis Stream Batch Size
S3	Trigger AWS Lambda in response to file dropped in S3 bucket	Bucket Name Event Type (Object Removed, Object Created)
SNS	Trigger AWS Lambda whenever the message is published to Amazon SNS Topic	SNS Topic

Troubleshooting
Error	Possible Reason	Solution
File "/var/task/lambda_function.py", line 2, in lambda_handler return event['demoevent'] KeyError: 'demoevent'	Event does not have the key 'demoevent' or either misspelled	Make sure the event is getting the desired key if it is receiving the event from any trigger. Or if the not outside event is passed than check for misspell. Or check the event list by printing event.
botocore.exceptions.ClientError: An error occurred (AccessDeniedException) when calling the GetParameters operation: User: arn:aws:dummy::1234:assumed-role/role/ is not authorized to perform: ssm:GetParameters on resource: arn:aws:ssm:dummy	Lacks Permission to access	Assign appropriate permission for accessibility
ImportError: Missing required dependencies [‘module']	Dependent module is missing	Install/Upload the required module
sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "host.dummy.region.rds.amazonaws.com" to address: Name or service not known	RDS Host is unavailable	Make sure the RDS instance is up and running. Double check the RDS hostname
[Errno 32] Broken pipe	Connection is lost (Either from your side or may be some problem from AWS) While invoking another Lambda, if the payload size exceed the mentioned limit	Make sure if you are passing the payload of right size. Check for the connection.
Unable to import module ‘lambda_function/index’ No module named ‘lambda_function'	Handler configuration is not matching the main file name	Update the handler configuration as per your filename.function_name

AWS Lambda CLI commands

Add Permission

It add mention permission to the Lambda function

Syntax

  add-permission
--function-name <value>
--statement-id <value>
--action <value>
--principal <value>
[--source-arn <value>]
[--source-account <value>]
[--event-source-token <value>]
[--qualifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

add-permission --function-name functionName --statement-id role-statement-id --action lambda:CreateFunction --principal s3.amazonaws.com

Create Alias

It creates alias for the given Lambda function name

Syntax

  create-alias
--function-name <value>
--name <value>
--function-version <value>
[--description <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

create-alias --function-name functionName --name fliasName --function-version version

Create Event Source Mapping

It identify event-source from Amazon Kinesis stream or an Amazon DynamoDB stream

  create-event-source-mapping
--event-source-arn <value>
--function-name <value>
[--enabled | --no-enabled]
[--batch-size <value>]
--starting-position <value>
[--starting-position-timestamp <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

create-event-source-mapping --event-source-arn arn:aws:kinesis:us-west-1:1111 --function-name functionName --starting-position LATEST

Create Function

It creates the new function

Syntax

  create-function
--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>]
[--zip-file <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

create-function --function-name functionName --runtime python3.6 --role arn:aws:iam::account-id:role/lambda_basic_execution
 --handler main.handler

Delete Alias

It deletes the alias

Syntax

  delete-alias
--function-name <value>
--name <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

delete-alias --function-name functionName --name aliasName

Delete Event Source Mapping

It deletes the event source mapping

Syntax

  delete-event-source-mapping
--uuid <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

delete-event-source-mapping --uuid 12345kxodurf3443

Delete Function

It will delete the function and all the associated settings

Syntax

  delete-function
--function-name <value>
[--qualifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

delete-function --function-name FunctionName

Get Account Settings

It will fetch the user’s account settings

Syntax

  get-account-settings
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Get Alias

It returns the desired alias information like description, ARN

Syntax

  get-alias
--function-name <value>
--name <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

get-alias --function-name functionName --name aliasName

Get Event Source Mapping

It returns the config information for the desired event source mapping

Syntax

  get-event-source-mapping
--uuid <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

get-event-source-mapping --uuid 12345kxodurf3443

Get Function

It returns the Lambda Function information

Syntax

  get-function
--function-name <value>
[--qualifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

get-function --function-name functionName

Get Function Configuration

It returns the Lambda function configuration

Syntax

  get-function-configuration
--function-name <value>
[--qualifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

  get-function-configuration --function-name functionName

Get Policy

It return the linked policy with Lambda function

Syntax

  get-policy
--function-name <value>
[--qualifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

get-policy --function-name functionName

Invoke

It invoke the mention Lambda function name

  invoke
--function-name <value>
[--invocation-type <value>]
[--log-type <value>]
[--client-context <value>]
[--payload <value>]
[--qualifier <value>]

Example

invoke --function-name functionName

List Aliases

It return all the aliases that is created for Lambda function

Syntax

  list-aliases
--function-name <value>
[--function-version <value>]
[--marker <value>]
[--max-items <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

  list-aliases --function-name functionName

List Event Source Mappings

It return all the list event source mappings that is created with create-event-source-mapping

Syntax

  list-event-source-mappings
[--event-source-arn <value>]
[--function-name <value>]
[--max-items <value>]
[--cli-input-json <value>]
[--starting-token <value>]
[--page-size <value>]
[--generate-cli-skeleton <value>]

Example

  list-event-source-mappings --event-source-arn arn:aws:arn --function-name functionName

List Functions

It return all the Lambda function

Syntax

  list-functions
[--master-region <value>]
[--function-version <value>]
[--max-items <value>]
[--cli-input-json <value>]
[--starting-token <value>]
[--page-size <value>]
[--generate-cli-skeleton <value>]

Example

  list-functions --master-region us-west-1 --function-version ALL

List Tags

It return the list of tags that are assigned to the Lambda function

Syntax

  list-tags
--resource <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

  list-tags --resource arn:aws:function

List Versions by functions

It return all the versions of the desired Lambda function

Syntax

  list-versions-by-function
--function-name <value>
[--marker <value>]
[--max-items <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

list-versions-by-function --function-name functionName

Publish Version

It publish the version of the Lambda function from $LATEST snapshot

Syntax

  publish-version
--function-name <value>
[--code-sha-256 <value>]
[--description <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

  publish-version --function-name functionName

Remove Permission

It remove the single permission from the policy that is linked with the Lambda function

Syntax

 remove-permission
--function-name <value>
--statement-id <value>
[--qualifier <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

 remove-permission --function-name functionName --statement-id role-statement-id

Tag Resource

It creates the tags for the lambda function in the form of key-value pair

Syntax

  tag-resource
--resource <value>
--tags <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

tag-resource --resource arn:aws:arn --tags {‘key’: ‘pair’}

Untag Resource

It remove tags from the Lambda function

Syntax

 untag-resource
--resource <value>
--tag-keys <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

untag-resource --resource arn:aws:complete --tag-keys [‘key1’, ‘key2’]

Update Alias

It update the alias name of the desired lambda function

Syntax

  update-alias
--function-name <value>
--name <value>
[--function-version <value>]
[--description <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

update-alias --function-name functionName --name aliasName

Update Event Source Mapping

It updates the event source mapping incase you want to change the existing parameters

Syntax

  update-event-source-mapping
--uuid <value>
[--function-name <value>]
[--enabled | --no-enabled]
[--batch-size <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

update-event-source-mapping --uuid 12345kxodurf3443

Update Function Code

It updates the code of the desired Lambda function

Syntax

  update-function-code
--function-name <value>
[--zip-file <value>]
[--s3-bucket <value>]
[--s3-key <value>]
[--s3-object-version <value>]
[--publish | --no-publish]
[--dry-run | --no-dry-run]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

update-function-code --function-name functionName

Update Function Configuration

It updates the configuration of the desired Lambda function

Syntax

  update-function-configuration
--function-name <value>
[--role <value>]
[--handler <value>]
[--description <value>]
[--timeout <value>]
[--memory-size <value>]
[--vpc-config <value>]
[--environment <value>]
[--runtime <value>]
[--dead-letter-config <value>]
[--kms-key-arn <value>]
[--tracing-config <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Example

update-function-configuration --function-name functionName

References

For queries or issues, feel free to contact or open an issue

Name		Name	Last commit message	Last commit date
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LICENSE		LICENSE
README.md		README.md

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AWS Lambda Cheatsheet

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AWS Lambda Cheatsheet

This cheatsheet is probably based on Python

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