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Level 03 - Building Serverless apps using Kubeless

Languages Support

  • ballerina
  • dotnetcore
  • Golang
  • java
  • jvm
  • nodejs
  • php
  • Python
  • Ruby

Run Kubeless

$ export RELEASE=$(curl -s https://api.github.com/repos/kubeless/kubeless/releases/latest | grep tag_name | cut -d '"' -f 4)
$ kubectl create ns kubeless
$ kubectl create -f https://github.com/kubeless/kubeless/releases/download/$RELEASE/kubeless-$RELEASE.yaml
$ kubectl get pods -n kubeless

The above steps does the following:

  1. Checks the version for Kubeless
  2. Creates the namespace kubeless
  3. Creates 3 pods in the namespace (kubeless)
  • cronjobtriggers.kubeless.io
  • functions.kubeless.io
  • httptriggers.kubeless.io

Basics

Deploy Functions

kubeless function deploy hello --runtime python3.6 \
                                --dependencies /Users/ramitsurana/Projects/personal/kubernetes-workshop/kubernetes-resources/level-03/requirements.txt \
                                --from-file /Users/ramitsurana/Projects/personal/kubernetes-workshop/kubernetes-resources/level-03/server.py \
                                --handler server.hello

# update function
kubeless function update hello --runtime python3.6 \
                                --dependencies /Users/ramitsurana/Projects/personal/kubernetes-workshop/kubernetes-resources/level-03/requirements.txt \
                                --from-file /Users/ramitsurana/Projects/personal/kubernetes-workshop/kubernetes-resources/level-03/server.py \
                                --handler server.hello

List Functions

kubectl get functions

kubeless function ls

Check Logs Functions

kubectl logs -l function=hello

Invoke Function

kubeless function call hello --data 'Ramit'

Teardown

kubeless function delete hello
kubectl delete -f https://github.com/kubeless/kubeless/releases/download/$RELEASE/kubeless-$RELEASE.yaml

Trigger HTTP Functions

minikube addons enable ingress

# To Check
kubectl get pod -n kube-system -l app=nginx-ingress-controller

kubeless trigger http create hello --function-name hello
kubectl get ing
  • Using Domain Name
kubeless trigger http create hello --function-name hello --path echo --hostname rean-pune-office.com
  • Test Function
curl --data '{"Hi": "Ramit"}' \
  --header "Host: hello.192.168.99.100.nip.io" \
  --header "Content-Type:application/json" \
  192.168.99.100/hello

References