Serverless on Kubernetes

Sebastien Goasguen@sebgoa

www.skippbox.com

DON’T DISMISSForget the buzz, the FUD….

How I dismissed EC2:

Did not dismiss Docker and won’t dismiss Serverless

DON’T GET HANG UP ON THE NAME

Naming is hard they say...

Via Twitter from Serverless Austin…

Don’t mind the hype

Forget the hype focus on adoption

Definition

“Serverless can also mean applications where some amount of server-side logic is still written by the application developer but unlike traditional architectures is run in stateless compute containers that are event-triggered, ephemeral (may only last for one invocation), and fully managed by a 3rd party”

--Mike Roberts (https://martinfowler.com/articles/serverless.html)

Knitting services together through functions

https://aws.amazon.com/lambda/

Lambda examples:

IFTTT

Solutions

WHY THE FUSS ABOUT SERVERLESS ?

From @swardleyhttp://blog.gardeviance.org/2016/11/why-fuss-about-serverless.htmlAll maps hereafter are from Simon.

Value Chain and Evolution

Co-evolution

• As infrastructure and platform evolve towards utility

• So does Practice…it evolves.

• So imagine a pure Cloud world, with third party services, how do you stitch them together ?

• What does it trigger ?

“Worth based development” @swardley

• “FinDev”• FaaS gives you fine grain cost monitoring.

• Develop and optimize for cost/business

100% “DevOps”Focus on the biz, Go fast.

WHY KUBELESSServerless on Kubernetes

#1 Borg

#2 Change Mindset

• Everything is remote API driven– Deployments– Config– Volume mgt, RBAC …

• No SSH– I don’t care about servers anymore

• Containers are invisible• Brings focus on application architecture

KUBELESS ARCHITECTUREgithub.com/skippbox/kubeless

Leverage kubernetes

• ThirdPartyResource, gives us CRUD for functions

• Watch via a controller• Inject the function code via a ConfigMap• Kafka/Zookeeper for events

kubeless install

• Creates thirdpartyresource for CRUD of functions

• Creates a kubeless namespace• Launches controller as a deployment• Launches a Kafka/Zookeeper deployment

Lamba-k8s.io$ kubectl get thirdpartyresource lamb-da.k8s.io -o yaml

apiVersion: extensions/v1beta1description: 'Kubeless: Serverless framework for Kubernetes'kind: ThirdPartyResourcemetadata: creationTimestamp: 2017-02-02T14:30:20Z name: lamb-da.k8s.io resourceVersion: "54958" selfLink: /apis/extensions/v1beta1/thirdpartyresourceslamb-da.k8s.io uid: 203ddb53-e954-11e6-a0da-080027b57baeversions:- name: v1

kubeless create

• Creates custom resource (with thirdparty endpoint)

• Controllers creates deployment and service• Pod starts containers with REST wrapper• Function injected in runtime via configmap

Event based

• Topic created via kubeless CLI on Kafka broker• Specific runtime consumes messages on given

topic

DEMO

kubeless function create get \--trigger-http \--runtime \--handler \--from-file

kubeless roadmap

• Add new runtime (e.g nodejs)• Use Ingress resources• Instrument the runtime with prometheus for

monitoring• Horizontal Pod Autoscaling• Default services with event notification (e.g

Minio).

Kubernetes Services

• Deploy Services (backends) via helm

helm install stable/minio

• Access Services via the Service Broker API.

CONCLUSIONSgithub.com/skippbox/kubeless

Thanks

Respect each other…Don’t dismiss it …Evolve …Situational awareness …Focus on the business problem and deliver value…

@sebgoagithub.com/skippbox/kubeless