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Please explain the difference between ResourceQuota vs LimitRange objects in Kubernetes...?
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A resource quota, defined by a ResourceQuota object, provides constraints that limit aggregate resource consumption per namespace. It can limit the quantity of objects that can be created in a namespace by type, as well as the total amount of compute resources that may be consumed by resources in that namespace.
A LimitRange provides constraints that can: Enforce minimum and maximum compute resources usage per Pod or Container in a namespace. Enforce minimum and maximum storage request per PersistentVolumeClaim in a namespace. Enforce a ratio between request and limit for a resource in a namespace.
More specifically, Kubernetes is designed to accommodate configurations that meet all of the following criteria: No more than 110 pods per node. No more than 5000 nodes. No more than 150000 total pods.
Requests and LimitsRequests are what the container is guaranteed to get. If a container requests a resource, Kubernetes will only schedule it on a node that can give it that resource. Limits, on the other hand, make sure a container never goes above a certain value.
LimitRange and ResourceQuota are objects used to control resource usage by a Kubernetes cluster administrator.
ResourceQuota is for limiting the total resource consumption of a namespace, for example:
apiVersion: v1 kind: ResourceQuota metadata: name: object-counts spec: hard: configmaps: "10" persistentvolumeclaims: "4" replicationcontrollers: "20" secrets: "10" services: "10" LimitRangeis for managing constraints at a pod and container level within the project.
apiVersion: "v1" kind: "LimitRange" metadata: name: "resource-limits" spec: limits: - type: "Pod" max: cpu: "2" memory: "1Gi" min: cpu: "200m" memory: "6Mi" - type: "Container" max: cpu: "2" memory: "1Gi" min: cpu: "100m" memory: "4Mi" default: cpu: "300m" memory: "200Mi" defaultRequest: cpu: "200m" memory: "100Mi" maxLimitRequestRatio: cpu: "10" An individual Pod or Container that requests resources outside of these LimitRange constraints will be rejected, whereas a ResourceQuota only applies to all of the namespace/project's objects in aggregate.
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