Remember the following when you increase the size of a cluster:
New node instances are created using the same configuration as the existing instances
New Pods may be scheduled onto the new instances
Existing Pods are not moved onto the new instances
When you increase the size of a node pool that spans multiple zones, the new size represents the number of nodes in the node pool per zone. For example, if you have a node pool of size 2 spanning two zones, the total node count is 4. If you resize the node pool to size 4, the total node count becomes 8.
To resize a cluster's node pools, run the following command:
gcloud container clusters resize [CLUSTER_NAME] --node-pool [POOL_NAME] \ --num-nodes [NUM_NODES]
[CLUSTER_NAME] is the cluster's name.
[POOL_NAME] is the name of the node pool to resize.
[NUM_NODES] is the number of nodes to run in the pool.
Repeat this command for each node pool. If your cluster has only one node pool, omit the --node-pool flag.