Basics

• Lambda is Function As a Service (FAAS)
• Functions use supported runtimes
• Code is executed within runtime environment
• The environment is allocated memory which indirectly allocates CPU. Direct CPU allocation is not allowed
• Billed for time the function runs
• Supported runtime environments include Python,Ruby,Java,Go,C#,nodejs
• Custom runtime environments can be deployed by users using layers
• Lambda functions are stateless by default & is run inside a new runtime environment everytime its invoked
• One can allocate 128MB to 10240MB memory to a lambda
• While one can not directly allocate a CPU, every 1769 MB memory gives 1 vCPU
• 512MB of disc storage is allocated by default available as /tmp in the runtime environment
• One can allocate upto 10240 MB of /tmp
• Lambda functions can run upto 900 seconds. Step functons can be used for extended time
• Security is controlled by execution roles which are IAM roles associated with Lambda