The document discusses serverless computing and OpenFaaS. It defines serverless functions as short-lived, stateless chunks of code that execute in response to events without managing servers. OpenFaaS is introduced as a serverless platform that allows functions to run on Kubernetes and Docker Swarm, providing routing, scaling, and lifecycle management. The architecture of OpenFaaS is shown using containers powered by Docker and orchestrated using Docker Swarm to provide a serverless infrastructure. Finally, a demo of building serverless functions with OpenFaaS is proposed.

1. Serverless with
OpenFaaS
Tampere ApiOPS Meetup
14.11.2017
https://www.meetup.com/APIOps-Tampere/

2. Let’s sail together.
E F I C O D E . C O M / W O R K

3. What ? Why ?
How?
E F I C O D E . C O M

4. Serverless? - Architecture is evolving
E F I C O D E . C O M
"Serverless" is a misnomer - we're talking about a new
architectural pattern for event-driven systems. For this reason
serverless functions are often used as connective glue between other
services or in an event-driven architecture. In the days of old we
called this a service bus.
Source: https://blog.alexellis.io/introducing-functions-as-a-service/

5. Serverless Function ?
E F I C O D E . C O MSource: https://blog.alexellis.io/introducing-functions-as-a-service/
A serverless function is a small, discrete and
reusable chunk of code that:
● is short-lived
● is not a daemon (long-running)
● does not publish TCP services
● is not stateful (=stateless)
● makes use of your existing services or
third-party resources
● executes in a few seconds (based upon AWS
Lambda's default
Function Container(s)
Serverless Function

6. Serverless Platform ?
E F I C O D E . C O M
● Host functions
● Route entrypoins to functions
● Scale functions and infrastructure
● Handle functions lifetime
● Centralized auth to functions Serverless (OpenFaaS)
Serverless Infra
On one hand we have Serverless products from IaaS providers such as Lambda, Google Cloud
Functions and Azure functions and on the other frameworks such as OpenFaaS which let an
orchestration platform such as Docker Swarm or Kubernetes do the heavy lifting.
Source: https://blog.alexellis.io/introducing-functions-as-a-service/

7. OpenFaas Architecture
E F I C O D E . C O M

8. E F I C O D E . C O M
PROMETHEUS
A Tiny HTTP server
Entrypoint for HTTP requests
Forwards to target process
Uses STDIN
API replies with STDOUT
External route to the functions
UI to browse and invoke functions
Metrics
Scaling of the containers
Docker Swarm mode
Kubernetes
WATCHDOG API GATEWAY
Function Orchestration
E F I C O D E . C O M

9. OpenFaaS Demo Architecture
E F I C O D E . C O M
Computing resources
Virtual- and/or physical- servers

10. OpenFaaS Demo Architecture
E F I C O D E . C O M
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)

11. OpenFaaS Demo Architecture
E F I C O D E . C O M
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)

12. OpenFaaS Demo Architecture
E F I C O D E . C O M
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)

13. OpenFaaS Demo Architecture
E F I C O D E . C O M
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

14. OpenFaaS Demo Architecture
E F I C O D E . C O M
Serverless (OpenFaaS)
Serverless InfraComputing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

15. OpenFaaS Demo Architecture
E F I C O D E . C O M
Serverless (OpenFaaS)
Serverless Infra
Function Container
Serverless Function
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

16. OpenFaaS Demo Architecture
E F I C O D E . C O M
Serverless (OpenFaaS)
Serverless Infra
Function Container
Serverless Function
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

17. OpenFaaS Demo Architecture
E F I C O D E . C O M
Serverless (OpenFaaS)
Serverless Infra
Function Container
Serverless Function
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

18. OpenFaaS Demo Architecture
E F I C O D E . C O M
Serverless (OpenFaaS)
Serverless Infra
Function Container
Serverless Function
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

19. OpenFaaS Demo Architecture
E F I C O D E . C O M
Serverless (OpenFaaS)
Serverless Infra
Function Container
Serverless Function
Computing resources
Virtual- and/or physical- servers Docker Container
Platform(s)
Docker Swarm Mode
Clustering

20. Jam with
OpenFaaS
https://www.openfaas.com/
E F I C O D E . C O M

21. THANK YOU
E F I C O D E . C O M
Sakari Hoisko
Senior Devops Consultant
sakari.hoisko@eficode.com
Mikki Levón
Software Engineer
mikki.levon@eficode.com
https://www.linkedin.com/in/mikki-levon/