Scaling up 400 worker nodes on gcp, after all machines are running the cluster will be unreachable, master n2-standard-4, worker n2-standard-2

Always

always

1. Set up a cluster on gcp master n2-standard-4, worker n2-standard-2 
2. Scale up machineset to 400
3. After all machines are running, run oc commands.
    

oc commands always get "Unable to connect to the server: EOF"

$ oc scale machineset zhsungcp-t9nql-worker-b --replicas 200     [15:39:41] 
oc scale machineset zhsungcp-t9nql-worker-c --replicas 100
oc scale machineset zhsungcp-t9nql-worker-d --replicas 100
machineset.machine.openshift.io/zhsungcp-t9nql-worker-b scaled
machineset.machine.openshift.io/zhsungcp-t9nql-worker-c scaled
machineset.machine.openshift.io/zhsungcp-t9nql-worker-d scaled

$ oc get machine | grep Provisioning | wc                [15:59:36]
oc get machine | grep Provisioned | wc -l
oc get machine | grep Running | wc -l
      18
      59
     332

$ oc get machine | grep Provisioning | wc -l             [16:06:43]
oc get machine | grep Provisioned | wc -l
oc get machine | grep Running | wc -l
       0
       0
     403
$ oc get csr | grep Pending | wc -l                   [16:08:14]
       0

mapi_machine_phase_transition_seconds_sum{phase="Running"} 393510.21958385484
mapi_machine_phase_transition_seconds_count{phase="Running"} 403

 $ oc get co                              [16:32:18]
Unable to connect to the server: EOF

The cluster is reachable