I have a list of namespaces created under the same k8s cluster and I'd like to find out the resource (CPU, memory) usage per namespace. Is there any command I can use?
Thanks Rico, the answer is good but just as an addition:
You can specify resource quotas and then view them as specified here. Other than that, there are external monitoring tools like Prometheus. Also, there is a Resource Explorer which can:
Display historical statistical resource usage from StackDriver.
https://github.com/kubernetes/kubernetes/issues/55046
List resource QoS allocation to pods in a cluster. Inspired by:
The case is still open on GitHub, but it seems there should be some changes eventually as one of the contributors states there is a plan to remove kubectl top and using some native solutions so I advise to follow this thread.
Write a shell script to get all namespaces in the cluster. Iterate through each namespace. Run kubectl top pod. Add up the cpu and memory of all pods in the name space.
Yes. You can use
$ kubectl -n <nampespace> top podFor example:
$ kubectl top pod -n kube-system
NAME CPU(cores) MEMORY(bytes)
calico-node-xxxxx 17m 166Mi
coredns-xxxxxxxxxx-xxxxx 2m 11Mi
coredns-xxxxxxxxxx-xxxxx 3m 11Mi
etcd-ip-x-x-x-x.us-west-2.compute.internal 19m 149Mi
kube-apiserver-ip-x-x-x-x.us-west-2.compute.internal 39m 754Mi
kube-controller-manager-ip-x-x-x-x.us-west-2.compute.internal 20m 138Mi
kube-proxy-xxxxx 5m 12Mi
kube-scheduler-ip-x-x-x-x.us-west-2.compute.internal 6m 17Mi
metrics-server-xxxxxxxxxx-xxxxx 0m 15MiYou need to add up all the entries on the CPU and MEMORY columns if you want the total.
Note that for kubectl top to work you need to have the metrics-server set up and configured appropriately. (Older clusters use the heapster)