Lambda calculus cheat sheet archive#
Lambda calculus cheat sheet code#

Lambda uses this information to set up elastic network interfaces ( ENIs) that enable your function to connect securely to other resources within your private VPC.To enable your Lambda function to access resources inside your private VPC, you must provide additional VPC-specific configuration information that includes VPC subnet IDs and security group IDs.

Lambda calculus cheat sheet code#

AWS Lambda runs function code securely within a VPC b default.

start -> BeforeAllowTraffic -> AllowTraffic -> After AllowTraffic -> End.

To resolve lambda throttled exception when using Cognito events, perform retry on sync.

If there is an incompatible output returned from a Lambda proxy integration backend, it will return 502.

Integrating Cloud Watch Events with lambda can be used for scheduling events.

API Gateway - Stage variables are name-value pairs that you can define as configuration attributes associated with a deployment stage of a REST API.

AWSLambdaDynamoDBExecutionRole is required to enable Lambda to work with DynamoDB

Amazon DynamoDB is integrated with AWS Lambda so that you can trigger pieces of code that automatically respond to events in DynamoDB Streams.

With layers, you can use libraries in your function without needing to include them in your deployment package

Lambda calculus cheat sheet archive#

Lambda Layer - Layer is a ZIP archive that contains libraries, a custom runtime, or other dependencies.is a feature of Amazon CloudFront that lets you run code closer to users of your application, which improves performance and reduces latency.Users can access the function version using the alias ARN A Lambda alias is like a pointer to a specific Lambda function version.

Lambda Alias: You can create one or more aliases for our AWS Lambda function.

Clients of Lambda function can call a specific version or at the latest implementation

By default, each AWS Lambda function has a single current version of the code.

Increasing memory in lambda will increase CPU in lambda.

AWS Lambda compute platform deployments cannot use an in-place deployment type.

Request parameter based Lambda authorizer.

Lambda authorizer can be used for custom authorization scheme.

A Lambda authorizer is an API Gateway feature that uses a Lambda function to control access to your API.

AWS_PROXY in API gateway is primarily used for Lambda proxy integration.

Will get throttled if it exceeds concurrency limit

Concurrency limit of lambda execution, Default 1000 Reserved - 900 unreserved 100.

Lambda concurrent executions = (invocations per second) x (average execution duration in seconds).

Environment variables are key-value pairs that you create and modify as part of your function configuration.

Lambda Environment variables are variables that enable you to dynamically pass settings to your function code and libraries, without making changes to your code.

You can include a runtime in your function's deployment package in the form of an executable file named bootstrap A runtime is a program that runs a Lambda function's handler method when the function is invoked. It also provides a Runtime API which allows you to use any additional programming languages to author your functions. AWS Lambda natively supports Java, Go, PowerShell, Node.js, C#, Python, and Ruby code.Lambda execution context is a temporary runtime environment that initializes any external dependencies of our Lambda function code, such as database connections or HTTP endpoints.