Upgrade to Pro — share decks privately, control downloads, hide ads and more …

The Real Value of Serverless

The Real Value of Serverless

Simon Martinelli

October 01, 2021

More Decks by Simon Martinelli

Other Decks in Programming


  1. ABOUT ME @simas_ch 2 2019 2000 1995 Java COBOL 2009

    2007 2012 2011 JSR-352 Java Batch 2013 JSR-354 Money/Currency
  2. 4

  3. IBM IMS • Designed 1966 for the Apollo program to

    inventory the very large bill of materials for the Saturn V moon rocket and Apollo space vehicle 5
  4. FAAS (FUNCTIONS AS A SERVICE) • Focus more on code,

    not infrastructure • Pay only for the resources you use, when you use them • Scale up or down automatically • Get all the benefits of robust cloud infrastructure 10 Serverless does not mean NO SERVER!
  5. WHAT ABOUT MICRO? • Functions are small • Functions only

    have one purpose • Functions are modules • A module is a self-contained component of a system, interchangeable, which has a well-defined interface 12
  6. WHAT ABOUT SERVICES? • Service-Oriented Architecture (SOA) is an architectural

    style that supports service-orientation • Service-orientation is a way of thinking in terms of services and service-based development and the outcomes of services • Service • Is a logical representation of a repeatable business activity that has a specified outcome (e.g., check customer credit, provide weather data) • Is self-contained • May be composed of other services • Is a black box to consumers of the service 13 Source: http://www.opengroup.org/soa/source-book/soa/p1.htm
  7. SERVERLESS ARCHITECTURE • Serverless applications are event-driven, cloud-based systems where

    application development rely solely on a combination of third-party services, client-side logic and cloud-hosted remote procedure calls • Key Properties • Independent, server-side, logical functions • Stateless • Short-lived • Event-triggered • Scalable by default • Fully managed in the cloud 14
  8. PROS CONS • Pay for what you use • Faster

    delivery due to smaller units • Zero system administration • Easier operations • Monitoring out of the box • Faster setup • Scalable • Reduced control • Vendor lock-in • Architectural complexity • Disaster recovery • Local tests 15
  9. 16

  10. HOW TO ACHIEVE VENDOR INDEPENDENCE? • Serverless leads to vendor

    lock-in! • But there are alternatives 18
  11. HELLO WORLD function main() { return { payload: 'Hello world'

    }; } > wsk action create helloJS hello.js > wsk action invoke helloJS --blocking 23
  12. WEB ACTIONS function main({name}) { var msg = 'You did

    not tell me who you are!'; if (name) { msg = 'Hello ${name}!' } return {body: '<html><body><h3>${msg}</h3></body></html>'} } > wsk -i action create helloweb helloweb.js --web true > wsk –i action get helloweb --url 24
  13. TRIGGERS AND RULES • Triggers are named channels for classes

    or kinds of events sent from Event Sources. • Rules are used to associate one trigger with one action • What are Event Sources? • Messages arriving on Message Queues • Changes in Databases • Website or Web Application interactions • Service APIs being invoked • IoT Frameworks forwarding device sensor data • OpenWhisk is based on an event-driven architecture 25
  14. THE REAL VALUES • Zero operations but risk of vendor-lock-in

    • Enforces modularity • No one-size-fits-all 28