2024-07-12
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In Kubernetes (K8s),request
andlimit
These are two important concepts used to control and manage container resource usage.
request
Defines the minimum amount of resources that need to be guaranteed when the container starts. This means that when Kubernetes schedules the Pod to a node, it will ensure that there are enough resources on the node to meet the Pod's requirements.request
Only when the available resources on the node are greater than or equal to the Pod'srequest
, the Pod will be scheduled to the node.request
There is no upper limit on the resources used by the container. If business needs increase during the operation of the container, more thanrequest
of resources, but can only use up tolimit
The amount of resource defined.request
Ensuring that the Pod has enough resources to run is the basic guarantee for container runtime.limit
Defines the maximum value of resources that a container can use. If set to 0, it means that there is no limit on resource usage, and the container can use resources without restriction.limit
Its role is to prevent a Pod from using resources without limit, causing other Pods to crash or affecting the stability of the entire cluster.0 <= request <= limit
This meansrequest
The value is always less than or equal tolimit
The value of .In summary,request
andlimit
The main difference is that request is the resource guarantee when the container is started, while limit is the upper limit of resource usage when the container is running. By setting these two values reasonably, you can achieve flexible configuration and effective management of container resources and ensure the stability and efficiency of the cluster.
- apiVersion: v1
- kind: Pod
- metadata:
- name: guaranteed-pod
- spec:
- containers:
- - name: guaranteed-container
- image: nginx
- resources:
- requests:
- cpu: 500m
- memory: 500Mi
- limits:
- cpu: 500m
- memory: 500Mi