Serverless technologies with Kubernetes
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Stas Ivaschenko (Senior Operations Analyst/DevOps engineer at Provectus, Inc) Senior DevOps engineer, more than 10 years in IT. AWS, Chef, Ansible, Kubernetes, Docker, Hadoop. Best customers: Symantec, CloudMade Kubernetes is up and running, what's next? We will talk about recent experience with Kubernetes-centric Serverless technologies. Concepts, overview of 2 frameworks: funktion from RedHat's Fabric8 and Kubeless. How they stand against AWS Lambda and how they rely on Kubernetes internals to do what they are doing.
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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 – международная R&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 & Design eCommerce DevOps & Big data Where talents met opportunity
- 4. provectus.com Stanislav Ivashchenko Senior Operations Analyst/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
- 7. provectus.com Players in the game 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 $kubectl create 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 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
- 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 $kubectl create 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
- 17. provectus.com Fission: Hello world $#install fission $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!