I am trying to create a resource quota for a namespace in kubernetes. While writing the yaml file for the Resource Quota, what should I specify for the cpu requests - "cpu" or "requests.cpu" ? Also, is there any official documentation which specifies the difference between the two? I went through openshift docs which specify that both of these are same and can be used interchangeably.
You can use the cpu form if you follow the Kubernetes documentation.
The difference between adding requests or limit before memory or cpu in quota is described here: https://kubernetes.io/docs/concepts/policy/resource-quotas/#requests-vs-limits
The final results is the same but if you use the requests or limit you will have to have each containers in pod having those specified.
requests.cpu is used for ResourceQuota which can be applied at the namespace level.
apiVersion: v1
kind: ResourceQuota
metadata:
name: mem-cpu-demo
spec:
hard:
requests.cpu: "1"
requests.memory: 1Gi
limits.cpu: "2"
limits.memory: 2Giwhere as cpu is applied at pod level.
apiVersion: v1
kind: Pod
metadata:
name: quota-mem-cpu-demo
spec:
containers:
- name: quota-mem-cpu-demo-ctr
image: nginx
resources:
limits:
memory: "800Mi"
cpu: "800m"
requests:
memory: "600Mi"
cpu: "400m"for further details please refer to the below link.
https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/quota-memory-cpu-namespace/