GKE list tainted nodepools with a specific taint

A use case for upgrades involved being able to list all the node pools that have scaled down back to 0 and have a specific taint. This blog post shows the commands you can use to get this information.

List the GKE nodepools that have been tainted with key=upgrade using GKE nodepool:

gcloud container node-pools list --cluster test-np-upgrades --flatten \
  --filter "config.taints.key=upgrade" --format 'value(name)'

For example in my case that returns:


Now if you want to get the number of nodes in that nodepool you could run:

kubectl get nodes -l cloud.google.com/gke-nodepool=default-pool \
  --output name --no-headers | wc -l