How can I list the taints on Kubernetes nodes?

Question

The docs are great about explaining how to set a taint on a node, or remove one. And I can use kubectl describe node to get a verbose description of one node, including its taints. But what if I've forgotten the name of the taint I created, or which nodes I set it on? Can I list all of my nodes, with any taints that exist on them?

Answer 1

kubectl get nodes -o json | jq '.items[].spec' 

which will give the complete spec with node name, or:

kubectl get nodes -o json | jq '.items[].spec.taints' 

will produce the list of the taints per each node

Answer 2

In Kubernetes 1.6.x the node taints have moved into the spec. Therefore the above answer by jaxxstorm will not work. Instead, you can use the following template.

{{printf "%-50s %-12s\n" "Node" "Taint"}} {{- range .items}}     {{- if $taint := (index .spec "taints") }}         {{- .metadata.name }}{{ "\t" }}         {{- range $taint }}             {{- .key }}={{ .value }}:{{ .effect }}{{ "\t" }}         {{- end }}         {{- "\n" }}     {{- end}} {{- end}} 

I have that saved into a file and then reference it like so:

kubectl get nodes -o go-template-file="./nodes-taints.tmpl" 

You'll get output like so:

Node                                            Taint ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=etcd:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=jenkins:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=etcd:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=containerlinux-canary-channel-workers:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=jenkins:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=etcd:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=etcd:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=etcd:NoSchedule ip-xxx-xxx-xxx-xxx.us-west-2.compute.internal   dedicate=jenkins:NoSchedule 

I'm not a huge go template user so I'm sure there are some things I could have done better but it is what it is.

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Same as above but all in one line:

kubectl get nodes -o go-template='{{printf "%-50s %-12s\n" "Node" "Taint"}}{{- range .items}}{{- if $taint := (index .spec "taints") }}{{- .metadata.name }}{{ "\t" }}{{- range $taint }}{{- .key }}={{ .value }}:{{ .effect }}{{ "\t" }}{{- end }}{{- "\n" }}{{- end}}{{- end}}'