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文章目录
- 1. 创建一个ResourceQuota
- 2. 创建一个pod
1. 创建一个ResourceQuota
apiVersion: v1
kind: ResourceQuota
metadata:
name: mem-cpu-demo
spec:
hard:
requests.cpu: "1"
requests.memory: 1Gi
limits.cpu: "2"
limits.memory: 2Gi
kubectl create namespace quota-mem-cpu-example
kubectl apply -f https://k8s.io/examples/admin/resource/quota-mem-cpu.yaml ;--namespace=quota-mem-cpu-example
kubectl get resourcequota mem-cpu-demo ;--namespace=quota-mem-cpu-example ;--output=yaml
2. 创建一个pod
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 https://k8s.io/examples/admin/resource/quota-mem-cpu-pod.yaml ;--namespace=quota-mem-cpu-example
kubectl get pod quota-mem-cpu-demo ;--namespace=quota-mem-cpu-example
kubectl get resourcequota mem-cpu-demo ;--namespace=quota-mem-cpu-example ;--output=yaml
输出显示配额以及已使用了多少配额。您可以看到Pod的内存和CPU请求以及限制没有超过配额。
status:
hard:
limits.cpu: "2"
limits.memory: 2Gi
requests.cpu: "1"
requests.memory: 1Gi
used:
limits.cpu: 800m
limits.memory: 800Mi
requests.cpu: 400m
requests.memory: 600Mi
注意，已用内存请求和此新内存请求的总和超过了内存请求配额。600 MiB + 700 MiB> 1 GiB。
尝试创建Pod：
kubectl apply -f https://k8s.io/examples/admin/resource/quota-mem-cpu-pod-2.yaml ;--namespace=quota-mem-cpu-example
没有创建第二个Pod。输出显示创建第二个Pod将导致内存请求总数超过内存请求配额。
Error from server (Forbidden): error when creating "examples/admin/resource/quota-mem-cpu-pod-2.yaml":
pods "quota-mem-cpu-demo-2" is forbidden: exceeded quota: mem-cpu-demo,
requested: requests.memory=700Mi,used: requests.memory=600Mi, limited: requests.memory=1Gi
参考资料：
- https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/quota-memory-cpu-namespace/
- 为命名空间配置默认的内存请求和限制
- Pod开销