Kubernetes API - gets Pods on specific nodes

Reading the Kubernets documentation it looks to be possible to select a certain range of pods based on labels. I want to select all the pods on one node but I don't want to label each pod on their corresponding node.

Am I missing something from the documentation or is it just not possible to select by node?

If I do:

kubectl get pods \
--output=wide
--namespace=$NS \
--server=$SERVER | head

#=>

NAME   READY     STATUS             RESTARTS   AGE       NODE

Can any of these headers be used as selector? If yes, how to do it with kubectl? How to do it with the API?

Solution 1:

As mentioned in the accepted answer the PR is now merged and you can get pods by node as follows:

kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=<node>

Solution 2:

Example sorting pods by nodeName:

kubectl get pods -o wide --sort-by="{.spec.nodeName}"

Example of getting pods on nodes using label filter:

for n in $(kubectl get nodes -l your_label_key=your_label_value --no-headers | cut -d " " -f1); do 
    kubectl get pods --all-namespaces  --no-headers --field-selector spec.nodeName=${n} 
done

or by number of restarts

kubectl get pods --sort-by="{.status.containerStatuses[:1].restartCount}"

Example filtering by nodeName using --template flag:

$ kubectl get nodes

NAME                         STATUS                     AGE
ip-10-0-90-30.ec2.internal   Ready                      2d
ip-10-0-90-35.ec2.internal   Ready                      2d
ip-10-0-90-50.ec2.internal   Ready,SchedulingDisabled   2d
ip-10-0-91-60.ec2.internal   Ready                      2d
ip-10-0-91-65.ec2.internal   Ready                      2d


$kubectl get pods --template '{{range .items}}{{if eq .spec.nodeName "ip-10-0-90-30.ec2.internal"}}{{.metadata.name}}{{"\n"}}{{end}}}{{end}}'

filebeat-pezch
app-5xole
node-exporter-6kfs8
prometheus-0
sso-359976856-wu8zt

Solution 3:

You also can query for all pods an a node with the following command

kubectl get pods -o wide --all-namespaces | grep <YOUR-NODE>