Kubeless

Kubeless is a Kubernetes-native serverless framework. It runs on top of your Kubernetes cluster and allows you to deploy small unit of code without having to build container images. With kubeless you can build advanced applications that tie together services using functions.

TL;DR;

$ helm repo add incubator https://kubernetes-charts-incubator.storage.googleapis.com/
$ helm install --namespace kubeless incubator/kubeless

Introduction

This chart bootstraps a Kubeless and a Kubeless-UI deployment on a Kubernetes cluster using the Helm package manager.

Prerequisites

• Kubernetes 1.7+ with Beta APIs enabled

Installing the Chart

To install the chart with the release name my-release:

$ helm install --name my-release --namespace kubeless incubator/kubeless

NOTE

While the chart supports deploying Kubeless to any namespace, Kubeless expects to be deployed under a namespace named kubeless.

The command deploys Kubernetes on the Kubernetes cluster in the default configuration. The configuration section lists the parameters that can be configured during installation.

Tip: List all releases using helm list

Uninstalling the Chart

To uninstall/delete the my-release deployment:

$ helm delete my-release

The command removes all the Kubernetes components associated with the chart and deletes the release.

Kafka Trigger

Kubeless supports triggering functions via Kafka events. More info here: https://kubeless.io/docs/use-existing-kafka/. An existing Kafka cluster needs to be accessible to kubeless -- if you like, you may look into setting Kafka up via the Kafka chart. Once Kafka is running, to enable the Kafka trigger you must congifure the following values: rbac.create: true, kafkaTrigger.enabled: true, kafkaTrigger.env.kafkaBrokers: <your_kafka_brokers>.

Configuration

The following table lists the configurable parameters of the Kubeless chart and their default values.

Parameter	Description	Default
rbac.create	Create RBAC backed ServiceAccount	false
config.builderImage	Function builder image	kubeless/function-image-builder
config.builderImagePullSecret	Secret to pull builder image	""
config.builderImage	Provision image	kubeless/unzip
config.builderImagePullSecret	Secret to pull provision image	""
config.deploymentTemplate	Deployment template for functions	{}
config.enableBuildStep	Enable builder functionality	false
config.functionRegistryTLSVerify	Enable TLS verification for image registry	{}
config.runtimeImages	Runtimes available	python, nodejs, ruby, php and go
controller.deployment.image.repository	Controller image	bitnami/kubeless-controller-manager
controller.deployment.image.pullPolicy	Controller image pull policy	IfNotPresent
controller.deployment.replicaCount	Number of replicas	1
ui.enabled	Kubeless UI component	false
ui.deployment.ui.image.repository	Kubeless UI image	bitnami/kubeless-ui
ui.deployment.ui.image.pullPolicy	Kubeless UI image pull policy	IfNotPresent
ui.deployment.proxy.image.repository	Proxy image	kelseyhightower/kubectl
ui.deployment.proxy.image.pullPolicy	Proxy image pull policy	IfNotPresent
ui.deployment.replicaCount	Number of replicas	1
ui.service.name	Service name	ui-port
ui.service.type	Kubernetes service name	NodePort
ui.service.externalPort	Service external port	3000
ui.ingress.enabled	Kubeless UI ingress switch	false
ui.ingress.annotations	Kubeless UI ingress annotations	{}
ui.ingress.path	Kubeless UI ingress path	{}
ui.ingress.hosts	Kubeless UI ingress hosts	[chart-example.local]
ui.ingress.tls	Kubeless UI ingress TLS	[]
kafkaTrigger.enabled	Kubeless Kafka Trigger	false
kafkaTrigger.env.kafkaBrokers	Kafka Brokers Environment Variable	localhost:9092
kafkaTrigger.deployment.ui.image.repository	Kubeless Kafka Trigger image	bitnami/kubeless-ui
kafkaTrigger.deployment.ui.image.pullPolicy	Kubeless Kafka Trigger image pull policy	IfNotPresent
kafkaTrigger.deployment.ui.image.tag	Kubeless Kafka Trigger image tag	v1.0.0-alpha.3

Specify each parameter using the --set key=value[,key=value] argument to helm install. For example,

$ helm install --name my-release --set service.name=ui-service,service,externalPort=4000 --namespace kubeless incubator/kubeless

The above command sets the Kubeless service name to ui-service and the external port to 4000.

Alternatively, a YAML file that specifies the values for the parameters can be provided while installing the chart. For example,

$ helm install --name my-release -f values.yaml --namespace kubeless incubator/kubeless

Tip: You can use the default values.yaml

Kubeless UI

The Kubeless UI component is disabled by default. In order to enable it set the ui.enabled property to true. For example,

$ helm install --name my-release --set ui.enabled=true --namespace kubeless incubator/kubeless