SERVERLESS

&

FaaS

Julien Bisconti

SRE / Data Engineer

Google Cloud Platform icon

contact

g.dev/julien

slides: bisconti.cloud

Content

  • Serverless in the context of DevOps
  • Function-as-a-Service
  • Tradeoffs
  • Demo

at the beginning there was an

APP

and the app was code

that needed to scale

👉 microservices

Deployment

Containers: lightweight VMs

  • 12 factor app
  • easier deploy
  • reproducible build


but ...

Deployment concerns

  • Scaling up and down
  • Redundancy
  • Scheduling / Orchestration
  • Service Discovery
  • Resiliency
  • Rolling out and back
  • Health checks
  • Secret and config

➡️ kubernetes

but ...

Kubernetes concerns

  • Logging
  • Tracing
  • Metrics
  • Dependency visualisation
  • Service identity and Auth
  • Circuit breaking
  • Traffic flow and policies
  • Failover
  • Fault injection
  • ...


➡️ ️ use code?

drawbacks

  • combination language/framework/version/feature
  • maintain, upgrade, migrate, retire
  • code pollution and complexity (+ testing)
  • deployment / rolling update
  • language/framework/version lock-in
  • debugging


➡️ ️ move it to the infrastructure

Meme CNCF landscape
production grade infrastructure

Yevgeniy Brikman - Lessons from 300k+ Lines of Infrastructure Code

overwhelmed yet ?

it's normal

Questions ?

SERVERLESS

Abstraction layer

  • serverless 👉 less servers
  • DevOps - Ops = Dev
  • Deploy functions 👉 FaaS

It is serverless the same way WiFi is wireless. At some point, it will hit a wire.

— Gojko Adzic
XaaS

I don't understand this abstraction

source

FaaS


exports.helloGET = (req, res) => {
  res.send('Hello World!');
};
source documentation

demo

Short example

Questions ?

Mental limitations


  • # decisions / day
  • # things to remember
  • speed of memory / reflexes

Consistency is key

source

Archives of the History of American Psychology, The Center for the History of Psychology, The University of Akron

army report uniformity

Questions ?

We could build it

BUT

spending time on the business

makes more sense financially

no code repository

Questions ?

tradeoffs

Developer time (build)
Use a product (buy)

On premise: fixed price and capacity
Cloud: pay for what you use

latency versus throughput

cold start ?

👉 strategy

mapping

Simon Wardly - Mapping

Questions ?

Mindset

connect services

Patrick Debois - From serverless to Service Full

Demo

In the ☁️

Gist for the demo
code used

Questions ?

Why deploying Go functions ?

Focus on code

OR?

Focus on:

  • code
  • business features
  • security
  • monitoring
  • performance
  • productivity
  • SLI/SLO/SLA
  • cost/resource optimization

THANK YOU

and I'm sorry 🙏
If you had to maintain my code
I hope you learned more by maintaining it
than me by writing it

contact

https://bisconti.cloud/

@julienBisconti

Slides made with Reveal.js and hugo-reveal