FaaS You Like It! @ewanslater Serverless CNCF Definition - - PowerPoint PPT Presentation

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FaaS You Like It! @ewanslater Serverless CNCF Definition - - PowerPoint PPT Presentation

Sep 09, 2023 158 likes •618 views

FaaS You Like It! @ewanslater Serverless CNCF Definition Serverless computing refers to the concept of building and running applications that do not require server management . It describes a finer-grained deployment model where

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FaaS You Like It!

@ewanslater

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“Serverless”

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CNCF Definition

“Serverless computing refers to the concept of building and running applications that do not require server management. It describes a finer-grained deployment model where applications, bundled as

  • ne or more functions, are uploaded to a platform and then executed, scaled,

and billed in response to the exact demand needed at the moment.”

  • CNCF Serverless Whitepaper
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Abstraction

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Functions

(as a service)

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FaaS

  • Small functions
  • Do one thing well
  • Easy to Understand
  • Run on Serverless platform (i.e. abstracted infrastructure)
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Avoid

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“Customers benefit from increased programming productivity and in many scenarios can enjoy cost savings as well.”

University of Berkeley, Technical Report No. UCB/EECS-2019-3

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Freedom(s)

  • Portability
  • Decentralisation
  • Packaging
  • Local testing
  • Language
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Fn Project

  • Fnproject.io
  • Serverless platform
  • Container based
  • Open Source (Apache 2.0)
  • CNCF
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Functions as Containers

  • Function
  • Dependencies
  • Self - Contained
  • Stateless
  • Ephemeral
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Runs on

  • Any Cloud
  • On Premises
  • Your laptop ;-)
  • Anywhere you’ve installed Docker
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Function Development Kits (FDKs)

  • Makes it a lot easier to write functions
  • Developer includes FDK package / library / gem
  • Developer writes function to the FDK’s interface
  • FDK

○ Provides input data to function ○ Writes output & errors

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Ruby FDK

  • Opens a socket in function container

○ (Fn Server connects to socket)

  • Parses input from http-stream
  • Executes function

○ Input ○ Context

  • Sends back output on http-stream
  • Writes errors to STDERR ( → syslog )
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No FDK, no problem!

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Fn Server

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Architecture (K8’s for production)

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Request Process

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Hot functions

  • Run at least once
  • Wait before terminating

○ Default timeout 30 seconds ○ Configurable

  • Potentially reusable

○ FDK handles multiple invocations ○ Stateless remember!?

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Orchestration

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Flow

  • Promises Based Orchestration

○ No new “special language” ○ Composable ○ Flexible

  • A Flow is…

○ ...written in code ○ ...a function ○ ...deployed within an app

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FaaS You Like It*

(*with apologies to Shakespeare)

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Serverless

  • Abstracted Infrastructure
  • Ephemeral Functions
  • Higher Productivity
  • Lower Costs
  • Beware of Lock In
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Fn Project

  • Open Source Serverless Platform
  • Container Based
  • Any language
  • Any Cloud
  • On Premises
  • Your Laptop ;-)
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Questions?

(grab me afterwards || @ewanslater)