cluster-overprovisioner

cluster-overprovisioner

This chart provide a buffer for cluster autoscaling to allow overprovisioning of cluster nodes. This is desired when you have work loads that need to scale up quickly without waiting for the new cluster nodes to be created and join the cluster.

It works by creating a deployment that creates pods of a lower than default PriorityClass. These pods request resources from the cluster but don't actually consume any resources. These pods are then evicted allowing other normal pods to be created while also triggering a scale-up by the cluster-autoscaler.

This approach is the current recommended method to achieve overprovisioning.

Homepage: https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler

How to install this chart

Add Delivery Hero public chart repo:

helm repo add deliveryhero https://charts.deliveryhero.io/

A simple install with default values:

helm install deliveryhero/cluster-overprovisioner

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

helm install my-release deliveryhero/cluster-overprovisioner

To install with some set values:

helm install my-release deliveryhero/cluster-overprovisioner --set values_key1=value1 --set values_key2=value2

To install with custom values file:

helm install my-release deliveryhero/cluster-overprovisioner -f values.yaml

Source Code

• https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler/FAQ.md#how-can-i-configure-overprovisioning-with-cluster-autoscaler
• https://github.com/kubernetes/autoscaler/blob/master/cluster-autoscaler
• https://github.com/kubernetes/kubernetes/tree/master/build/pause

Values

Key	Type	Default	Description
containerSecurityContext	object	{}	Container security context object
deployments	list	[]	Define optional additional deployments - A default deployment is included by default
deployments[0].affinity	object	{}	Default Deployment - Map of node/pod affinities
deployments[0].annotations	object	{}	Default Deployment - Annotations to add to the deployment
deployments[0].labels	object	{}	Default Deployment - Optional labels tolerations
deployments[0].name	string	"default"	Default Deployment - Name for additional deployments (will be added as label cluster-over-provisioner-name, so you can match it with affinity rules)
deployments[0].nodeSelector	object	{}	Default Deployment - Node labels for pod assignment
deployments[0].pdb	object	{}	Default Deployment - Optional PodDisruptionBudget
deployments[0].podAnnotations	object	{}	Default Deployment - Annotations to add to the pods
deployments[0].replicaCount	int	3	Default Deployment - Number of replicas
deployments[0].resources.limits.cpu	string	"1000m"	Default Deployment - CPU limit for the overprovision pods
deployments[0].resources.limits.memory	string	"1000Mi"	Default Deployment - Memory limit for the overprovision pods
deployments[0].resources.requests.cpu	string	"1000m"	Default Deployment - CPU requested for the overprovision pods
deployments[0].resources.requests.memory	string	"1000Mi"	Default Deployment - Memory requested for the overprovision pods
deployments[0].schedulerName	string	""	Default Deployment - Override the scheduler for overprovision pods
deployments[0].tolerations	list	[]	Default Deployment - Optional deployment tolerations
deployments[0].topologySpreadConstraints	list	[]	Default Deployment - Optional topology spread constraints
fullnameOverride	string	""	Override the fullname of the chart
image.args	list	[]	Override container args
image.command	list	[]	Override container command
image.pullPolicy	string	"IfNotPresent"	Container pull policy
image.repository	string	"registry.k8s.io/pause"	Image repository
image.tag	string	.Chart.AppVersion	Image tag
nameOverride	string	""	Override the name of the chart
podSecurityContext	object	{}	Pod security context object
priorityClassDefault.enabled	bool	true	If true, enable default priorityClass
priorityClassDefault.name	string	"default"	Name of the default priorityClass
priorityClassDefault.value	int	0	Priority value of the default priorityClass
priorityClassOverprovision.name	string	"overprovisioning"	Name of the overprovision priorityClass
priorityClassOverprovision.value	int	-1	Priority value of the overprovision priorityClass
serviceAccount.annotations	object	{}	Additional Service Account annotations
serviceAccount.automountServiceAccountToken	bool	true	Automount API credentials for a Service Account
serviceAccount.create	bool	true	Determine whether a Service Account should be created or it should reuse an exiting one
serviceAccount.name	string	nil	The name of the ServiceAccount to use. If not set and create is true, a name is generated using the fullname template

Maintainers

Name	Email	Url
max-rocket-internet	max.williams@deliveryhero.com
mmingorance-dh	miguel.mingorance@deliveryhero.com