Question 19631 in Amazon Web Sevices Question posted in
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How to describe a Kubernetes cluster using kubectl?

I want to check the Kubernetes configuration – how many nodes, etc. I tried the following command.

kubectl describe cluster
error: the server doesn't have a resource type "cluster"

BTW, I tried to use the following command to check the AZ of the nodes of the pods. But it returns <none> for all the pods’ nodes.

kubectl get pods -o=custom-columns=NAME:.metadata.name,ZONE:.metadata.labels.'topology.Kubernetes.io/zone'

How to use kubectl to find the AZs of the pods?

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3

Answers


  1. 0

    Try this command

    kubectl cluster-info
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  2. 0

    I could be missing the point of your question, but if you just need the nodes, you could do

    kubectl get nodes

    and then

    kubectl describe node {node-name}

    to get further details of an individual node

    You could also combine the output from kubectl get nodes and either use jsonpath or jq to filter the information you need.

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  3. 0

    Here are my nodes showing zone info(made up) in the cluster:

    kubectl get node -Ltopology.kubernetes.io/zone
NAME                            STATUS   ROLES           AGE   VERSION   ZONE
development-kube-controller-1   Ready    control-plane   48d   v1.24.6   zone
development-kube-worker-1       Ready    <none>          48d   v1.24.6   zone-A
development-kube-worker-2       Ready    <none>          48d   v1.24.6   zone-B

    Using the awk command, the label topology.kubernetes.io/zone is merged with the name of the pods scheduled on that particular node.

    NOTE: I have used lowercase k in the label key topology.kubernetes.io/zone; however, in your case, it’s uppercase K in the question. You might want to calibrate your command.

    kubectl describe  node |awk '/topology.kubernetes.io/zone/{zone=$1;next} /^  Namespace/{flag=1; getline; next} /^Allocated resources:/{flag=0} flag{print  $2, zone}' |column -t
calico-node-swz7j                                      topology.kubernetes.io/zone=zone
coredns-74d6c5659f-4mpcp                               topology.kubernetes.io/zone=zone
dns-autoscaler-59b8867c86-w4dls                        topology.kubernetes.io/zone=zone       
kubernetes-dashboard-648989c4b4-b4k7h                  topology.kubernetes.io/zone=zone-A
kubernetes-metrics-scraper-84bbbc8b75-x72pf            topology.kubernetes.io/zone=zone-A
nginx-proxy-development-kube-worker-1                  topology.kubernetes.io/zone=zone-A
nodelocaldns-xt6hr                                     topology.kubernetes.io/zone=zone-A
metallb-controller-94c85f6db-6j8j5                     topology.kubernetes.io/zone=zone-A
metallb-speaker-4fz99                                  topology.kubernetes.io/zone=zone-A
argocd-application-controller-0                        topology.kubernetes.io/zone=zone-B
argocd-applicationset-controller-5bff759d68-kk7tx      topology.kubernetes.io/zone=zone-B
argocd-dex-server-59c59b5d96-7z7th                     topology.kubernetes.io/zone=zone-B
argocd-notifications-controller-6df97c8577-26z9m       topology.kubernetes.io/zone=zone-B
argocd-redis-684fb8c6dd-bxb25                          topology.kubernetes.io/zone=zone-B
argocd-repo-server-79d8c5f7b4-fnh7g                    topology.kubernetes.io/zone=zone-B

    PS: You can print $1 in the awk command to print the namespace, in case of filtering based on namespace is needed.

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