How do I add VM instances to my existing Container Engine cluster?
I understand that I can add pods via replication controllers, but it seems there can be multiple pods per VM instance. Adding 50 new pods to my initial 3 VM cluster just distributed those pods evenly and did not start new instances. Not really helpful if I want to scale my app due to increased load.
For now, there isn't a way to scale your cluster. We are working on integrating Container Engine with the recently announced Managed Instance Groups and Cloud AutoScaling Service.
Stay tuned!
Resizing a cluster is now possible, see the docs
This may help you
https://cloud.google.com/container-engine/docs/resize-cluster
$ gcloud container clusters describe CLUSTER_NAME --format yaml | grep -A 1 instanceGroupUrls
$ gcloud compute instance-groups managed resize gke-example-b937f2ba-group --zone us-central1-f --size 4
来源：https://stackoverflow.com/questions/26899733/increasing-the-cluster-size-in-google-container-engine