How to identify static pods via kubectl command?

user_5691932 0
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I have several pods in 2 nodes in my Kubernetes cluster. (Please see below).

Is there a way I can tell which ones are static pods? (maybe a kubectl command of sort?)

Thanks!

controlplane $ k get pods -A -o wide
NAMESPACE     NAME                                   READY   STATUS    RESTARTS   AGE    IP            NODE           NOMINATED NODE   READINESS GATES
kube-system   coredns-f9fd979d6-h865q                1/1     Running   0          119s   10.244.0.5    node02   <none>           <none>
kube-system   coredns-f9fd979d6-z4j6f                1/1     Running   0          119s   10.244.1.5    node01         <none>           <none>
kube-system   etcd-a1b2k7h7                      1/1     Running   0          2m9s   172.17.0.79   node02   <none>           <none>
kube-system   kube-apiserver-g8j4k8o8            1/1     Running   0          2m9s   172.17.0.79   node02   <none>           <none>
kubectl kubernetes-pod kubernetes
3 Answers

Checking the owner reference of a static pod using kubectl describe command should indicate that such a pod is not controlled by a ReplicaSet but rather from Node/controlplane

user_24097930

You can filter by the OwnerReference.Kind. Static pods have the Node ownerReference kind.

You can use --custom-columns to list all your pods and its owner references. Example:

$ kubectl get pods --all-namespaces -o custom-columns=NAME:.metadata.name,CONTROLLER:.metadata.ownerReferences[].kind,NAMESPACE:.metadata.namespace
NAME                                        CONTROLLER   NAMESPACE
busybox-6ff78776d5-k56fx                    ReplicaSet   default
nginx-6b87f7d77c-rq6fl                      ReplicaSet   default
coredns-74ff55c5b-xpgnq                     ReplicaSet   kube-system
etcd-minikube                               Node         kube-system
ingress-nginx-admission-create-n6j7k        Job          kube-system
ingress-nginx-admission-patch-45xvw         Job          kube-system
ingress-nginx-controller-65cf89dc4f-g7lwm   ReplicaSet   kube-system
kindnet-44pq8                               DaemonSet    kube-system
kindnet-nqhg9                               DaemonSet    kube-system
kube-apiserver-minikube                     Node         kube-system
kube-controller-manager-minikube            Node         kube-system
kube-proxy-nmzbn                            DaemonSet    kube-system
kube-proxy-wlmdz                            DaemonSet    kube-system
kube-scheduler-minikube                     Node         kube-system
metrics-server-58966dd6b9-schjr             ReplicaSet   kube-system
storage-provisioner                         <none>       kube-system

Or use jq to filter only the Static pods (kind == "Node"):

$ kubectl get pods --all-namespaces -o json | jq -r '.items | map(select(.metadata.ownerReferences[]?.kind == "Node" ) | .metadata.name) | .[]'
etcd-minikube
kube-apiserver-minikube
kube-controller-manager-minikube
kube-scheduler-minikube
user_76410780

On Kubernetes v1.16.3 metadata.ownerReferences.kind isn't a thing so the recommended answer here didn't work. I was able to identify Static Pods by looking at the metadata.labels.tier key/value pair with equal to "control-plane" with jq using the following.

kubectl get pods --all-namespaces -o json | jq -r '.items | map(select(.metadata.labels.tier == "control-plane" ) | .metadata.name) | .[]'
user_18712530
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