How to extract the list of nodes which are tainted

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Cluster information:

Kubernetes version:1.15
Cloud being used: (put bare-metal if not on a public cloud)
Installation method: kubeadm
Host OS: linux
CNI and version:
CRI and version:

How to extract the list of nodes which are tainted. Unable to find node name when using jsonpath as “effect:NoSchedule” or viceversa in the Kubernetes command line

2

May be try this,

kubectl get nodes -o go-template=‘{{range $item := .items}}{{with $nodename := $item.metadata.name}}{{range $taint := $item.spec.taints}}{{if and (eq $taint.key “node-role.kubernetes.io/master”) (eq $taint.effect “NoSchedule”)}}{{printf “%s\n” $nodename}}{{end}}{{end}}{{end}}{{end}}’

kubectl get nodes -o go-template=‘{{range $item := .items}}{{with $nodename := $item.metadata.name}}{{range $taint := $item.spec.taints}}{{if and (ne $taint.key “node-role.kubernetes.io/master”) (ne $taint.effect “NoSchedule”)}}{{printf “%s\n” $nodename}}{{end}}{{end}}{{end}}{{end}}’

3

kubectl get nodes -o go-template=’{{range $item := .items}}{{with $nodename := $item.metadata.name}}{{range $taint := $item.spec.taints}}{{if and (eq $taint.key “node-role.kubernetes.io/master”) (eq $taint.effect “NoSchedule”)}}{{printf “%s\n” $nodename}}{{end}}{{end}}{{end}}{{end}}’

Corrected one

4 Likes
5

To get list of taint nodes

kubectl get nodes -o go-template=’{{range $item := .items}}{{with $nodename := $item.metadata.name}}{{range $taint := $item.spec.taints}}{{if (eq $taint.effect “NoSchedule”)}}{{printf “%s\n” $nodename}}{{end}}{{end}}{{end}}{{end}}’

replace ’ with ’ in command line

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I am not understand what it meaning {replace ’ with ’ in command line} in the previous comment @Klearner

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Best answer I got is this using jsonpath though

kubectl get nodes -o jsonpath=’{.items[].spec.taints[?(@.effect==“NoSchedule”)].effect}{"\t"}{.items[].metadata.name}’ | cut -f 2,3

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This is my answer:

kubectl get nodes -o jsonpath=’{range .items[]}{.metadata.name}{"\t"}{.spec.taints[].effect}{"\n"}{end}’

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Hello, mason1762
Are you sure it will work for all nodes?

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you can use this one

kubectl get nodes -o jsonpath="{range .items[*]}{.metadata.name} {.spec.taints[?(@.effect=='NoSchedule')].effect}{\"\n\"}{end}"
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14

kubectl get nodes -o jsonpath=’{.items.spec.taints[*].effect}’

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kubectl get node -o custom-columns=NAME:.metadata.name,TAINT:.spec.taints[*].effect

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Please try this one:

for kube_node in $(kubectl get nodes | awk '{ print $1 }' | tail -n +2); do
	echo ${kube_node} $(kubectl describe node ${kube_node} | grep Taint);
done
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21

Here’s a simple kubectl command to list all nodes that have taints in place.

k get nodes -o jsonpath='{$.items[?(@.spec.taints)].metadata.name}{"\n"}'

and the below command to lsit all nodes that doesn’t have taints in place. You need to have jq command line utility installed for this to work.

k get nodes -o json | jq '.items[] | select(.spec.taints | not) | .metadata.name'