- Virtual serverless functions
- Short executions
- On-demand
- Automated scaling
- Pay per request and compute time.
- Easy monitoring through CloudWatch
Cold Starts and Provisioned Concurrency
- New code is loaded, the code outside the handler run.
- It the initial is large, it takes time.
- First request served has higher latency.
- Concurrency is allocated before function is invoked.
- So the cold start never happens and all the invocations have low latency.
SnapStart
- Lambda initializes the function.
- Takes a snapshot of the memory and disk state.
- Snapshot is cached for low-latency.
Customization at the Edge
- Execute some form of logic at the edge.
- CloudFront provides two types: CloudFront Functions and Lambda@Edge.
Lambda in VPC
- By default, the Lambda functions is launched outsite VPC.
- You must define the VPC ID, the subnets and the security groups.
- Lambdda will create an Elastic Network Interface in your subnets.
Lambda with RDS Proxy
- Improve scalability.
- Improve security by enforcing IAM authentication.
Invoking Lambda from RDS & Aurora
- Allows to process data events from within a database.
- Support for RDS for PostgreSQL and Aurora MySQL.
- Must allow required permissions.
