You can only get a VM network tag with gcloud using the command

gcloud compute instances describe INSTANCE-NAME --project=PROJECT-ID --zone=INSTANCE-ZONE

The network tag information will be at the bottom and the output will be similar to:

tags:
  fingerprint: xxxx
  items:
  - tag1
  - tag2
  - tag3

All the VMs created by the cluster will have the same prefix. gke-CLUSTER_NAME-NODE_POOL_NAME-RANDOM_STRING.

For example I created cluster “test-cluster” and I’m using only “default-pool”. One of my instances is [gke-test-cluster-default-pool-xxxxxxx-xxxxxxx]

You can get all the instances names created by your clusters and put them in a variable similar to

name=`gcloud compute instances list --project=PROJECT-ID | grep gke | awk '{print $1}'`

Now you can use a FOR loop to run the command

for tags in $name; do gcloud compute instances describe $tags --project=PROJECT-ID --zone=ZONE; done

You can add a GREP at the end of the command just to fetch the network tag information , store the output in a file or parsed anyway you need it.

Does anyone know of a way of doing this using Terraform