Create Namespace
kubectl create namespace quota-mem-cpu-example
Create a ResourceQuota
quota.yaml:
apiVersion: v1
kind: ResourceQuota
metadata:
name: mem-cpu-demo
spec:
hard:
requests.cpu: "1"
requests.memory: 1Gi
limits.cpu: "2"
limits.memory: 2Gi
kubectl apply -f quota.yaml –namespace=quota-mem-cpu-example
Create a pod
pod1.yaml
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"
kubectl apply -f pod1.yaml –namespace=default-mem-example
success
Attempt to create a second Pod
pod2.yaml
apiVersion: v1
kind: Pod
metadata:
name: quota-mem-cpu-demo-2
spec:
containers:
- name: quota-mem-cpu-demo-ctr
image: nginx
resources:
limits:
memory: "700Mi"
cpu: "800m"
requests:
memory: "600Mi"
cpu: "400m"
kubectl apply -f pod2.yaml –namespace=default-mem-example
pod1 800 + pod2 700 > 1G : failed
Error from server (Forbidden): error when creating "https://k8s.io/examples/admin/resource/quota-mem-cpu-pod-2.yaml": pods "quota-mem-cpu-demo-2" is forbidden: exceeded quota: mem-cpu-demo, requested: limits.memory=1Gi,requests.memory=700Mi, used: limits.memory=800Mi,requests.memory=600Mi, limited: limits.memory=1Gi,requests.memory=1Gi
Update ResourceQuota
1G -> 2G quota.yaml:
apiVersion: v1
kind: ResourceQuota
metadata:
name: mem-cpu-demo
spec:
hard:
requests.cpu: "1"
requests.memory: 2Gi
limits.cpu: "2"
limits.memory: 2Gi
kubectl edit -f quota.yaml –namespace=quota-mem-cpu-example
Attempt to create a second Pod
kubectl apply -f pod2.yaml –namespace=default-mem-example
success
