When creating a new cluster in Google Kubernetes Engine with the gcloud container clusters create command, one can specify a list of authorized networks that can access the master using the --master-authorized-networks flag. That list can be updated by passing a list of new authorized networks to the --master-authorized-networks flag in a gcloud container clusters update command. This method apparently overrides the initial list of authorized networks with the new one. I'd like to know if there is a way to simply add a new authorized network(or an ip address) to the existing ones
If you do it through the GUI is additive, though when you the the SDK or the API, you are defining the list of authorized networks. So programmatically, no. Sounds like a good feature request though