Stas Ivaschenko (Senior Operations Analyst/DevOps engineer at Provectus) for OSDN conference (http://conference.osdn.org.ua)

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Serverless technologies with
Kubernetes
• What’s serverless and what it has to do with DevOps?
• Serverless overview/Competing products
• Kubeless
• Substitution for AWS Lambda
• Questions

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Mobile & Design eCommerce DevOps & Big data
Where talents met opportunity

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Stanislav Ivashchenko
Senior Operations Analyst/DevOps engineer

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What is serverless?
1. Function-as-a-service (Stateless)
2. Event-driven
3. Infrastructure is allocated and managed dynamically
4. Rapid scaling
5. Predefined runtimes

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General Architecture

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Players in the game today(much more not shown here)

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Similarities and differences
Similarities:
• Provide Function-as-a-service
• Rely on Kubernetes for infrastructure, scaling and configuration
• Use containers for runtimes
Differences:
• methods of handling events, event types, external integrations
• Exact implementation
• ability to group functions into Applications

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Kubeless
• Made by bitnami
• Uses Kafka(comes out of the box) for event sourcing
• Comes with Prometheus
• Out of the box runtimes: NodeJS, Python
• CLI compliant with AWS Lambda CLI
• 2 types of triggers: http and pubSub

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Kubeless and Kubernetes
• Creates new object Kind “Function”
• Uses ConfigMaps for storing settings/code
• Uses Services as Router for Http trigger
• Constantly running pod Kubeless Controller watches for functions create/update

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Kubeless: Hello world
$kubectl create ns kubeless
$kubectl -n kubeless create -f “kubeless-v0.1.0.yaml"
$#wait for kafka to start
$kubectl get pods -n kubeless
#Download kubeless binary for your platform
$kubeless function deploy get-python --runtime python27 --handler test.foobar
$ --from-file test.py --trigger-http
$curl --data '{"Another": "Echo"}' $(minikube service get-python --url)
--header "Content-Type:application/json"
{"Another": "Echo"}

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What’s inside
$ kubectl -n kubeless get po
NAME READY STATUS RESTARTS AGE
kafka-0 1/1 Running 0 10m
kubeless-controller-1732516646-j2krw 1/1 Running 0 10m
zoo-0 1/1 Running 0 10m
$ kubectl get po
NAME READY STATUS RESTARTS AGE
get-python-3134662221-8xk54 1/1 Running 0 7m
$ kubectl get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
get-python 10.0.0.189 <none> 8080/TCP 1m

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Configmaps
$ kubectl get configmap get-python -o yaml
apiVersion: v1
data:
handler: test.foobar
requirements.txt: ""
test.py: |
def foobar(context):
print context.json
return context.json
kind: ConfigMap

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Functions
$ kubectl get thirdpartyresources function.k8s.io -o yaml
apiVersion: extensions/v1beta1
description: Kubernetes Native Serverless Framework
kind: ThirdPartyResource
metadata:
creationTimestamp: 2017-09-15T17:29:28Z
name: function.k8s.io
resourceVersion: "1686"
selfLink: /apis/extensions/v1beta1/thirdpartyresourcesfunction.k8s.io
uid: 6d7b51be-9a3b-11e7-8af1-080027e0c7b3
versions:
- name: v1

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Classic example: image resize | AWS

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Classic example: image resize |Kubeless

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Configuration
#Install, configure minio
#Create bucket in Mino, enable notifications into Kubless Kafka
mc mb localminio/mybucket
mc events add localminio/mybucket arn:minio:sqs:us-east-1:1:kafka
#Create topic
kubeless topic create s3
#Create Kubless funciton with subscription to topic --trigger-topic <topic name>
kubeless function deploy thumb1 --trigger-topic s3 --runtime python2.7 --handler
resize.thumbnail --from-file resize.py --dependencies requirements.txt

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Results
#Upload file
mc cp horse_head.jpg localminio/mybucket/
#Get result
mc cp localminio/mybucket_ocr/horse_head.jpg.thumb ./

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The source
https://github.com/kubeless/kubeless/tree/master/examples/minio *
• При необходимости обработать напильником

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Skype:
Email:
Tel.:
provectus.com
ivaschenko.stas
sivaschenko@provectus.com
+380 679459912
Stanislav
Ivashchenko

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Thanks!
Questions?