Configuring AWS Lambda functions describes the how to configure the core capabilities and options for a function. Lambda also provides advanced features such as concurrency control, network access, database interworking, file systems, and code signing.
Concurrency is the number of instances of your function that are active. Lambda provides two types of concurrency controls: reserved concurrency and provisioned concurrency.
To use your Lambda function with AWS resources in an Amazon VPC, configure it with security groups and subnets to create a VPC connection. Connecting your function to a VPC lets you access resources in a private subnet such as relational databases and caches. You can also create a database proxy for MySQL and Aurora DB instances. A database proxy enables a function to reach high concurrency levels without exhausting database connections.
To use code signing with your Lambda function, configure it with a code-signing configuration. When a user attempts to deploy a code package, Lambda checks that the code package has a valid signature from a trusted publisher. The code-signing configuration includes a set of signing profiles, which define the trusted publishers for this function.