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Serverless technologies with Kubernetes
The document discusses serverless technologies in relation to Kubernetes, highlighting the concept of serverless computing, its architecture, and competing products like Funktion, Kubeless, and Fission. It provides an overview of these tools, their functionalities, and the differences in their implementations and event handling. The document also includes practical examples of using these tools for deployment and function creation.
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Serverless technologies with Kubernetes
- 1. provectus.com Serverless technologies with Kubernetes •What’s serverless and what it has to do with DevOps? • Serverless overview/Competing products • Funktion by RedHat • Kubeless • Fission • Questions
- 2. provectus.com Provectus – международнаяR&D компания, предоставляющая полный комплекс услуг по разработке программного обеспечения для корпоративного сегмента, мобильных платформ и WEB по всему миру. Palo Alto, California, USA Odesa, Ukraine Kazan, Russia Kyiv, Ukraine
- 3. provectus.com Mobile & DesigneCommerce DevOps & Big data Where talents met opportunity
- 4. provectus.com Stanislav Ivashchenko Senior OperationsAnalyst/DevOps engineer
- 5. provectus.com 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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- 7. provectus.com Players in thegame today(much more not shown here)
- 8. provectus.com 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
- 9. provectus.com Funktion Make no mistake,This is RedHat! • Part of Fabric8 platform • Which is an upstream from Openshift by RedHat • Uses Apache Camel for event sourcing(over 200 connectors) • Supports Flows as a way to combine multiple functions into complex applications • Out of the box runtimes: NodeJS, anything on JVM
- 10. provectus.com Funktion and Kubernetes •Stores everything in ConfigMap: Functions(code and settings), Flows, Connectors • Uses Kubernetes abstractions: Deployments for Runtimes, Services as Router • Mounts ConfigMap with code directly into Containers • Constantly running Pod with Operator that orchestrates everything • Relies on metadata in services, deployments
- 11. provectus.com Funktion: Hello World $kubectlcreate namespace funky $kubectl config set-context `kubectl config current-context` --namespace=funky $funktion install platform $funktion install connector http4 timer $funktion create fn -n hello -s 'module.exports = function(context, callback) { callback(200, "Hello, world!n"); }' $funktion get fn NAME PODS URL hello 0/1 http://192.168.99.100:32440 $curl http://192.168.99.100:32440 $ kubectl describe configmap hello
- 12. provectus.com Kubeless • Made bybitnami • 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
- 13. provectus.com 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
- 14. provectus.com Kubeless: Hello world $kubectlcreate ns kubeless $kubectl -n kubeless create -f “kubeless-0.0.18.yaml" $#wait for kafka to start $kubectl get pods -n kubeless $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"}
- 15. provectus.com Fission • early stage(Alpha) •Subscribes to Kubernetes watches for events in cluster • Out of the box runtimes: Python, NodeJS, Go, C#, PHP • Pre-warms Function containers(keeps a running pool of containers for each runtime) • Can use NATS for queues
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- 17. provectus.com Fission: Hello world $#installfission $kubectl create -f fission-rbac.yaml $kubectl create -f fission-nodeport.yaml $#create function and endpoint $fission function create --name hello --env nodejs --code hello.js $fission route create --method GET --url /hello --function hello $curl http://$node_ip/hello Hello, world!
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