Code change:
params+=" --advertise-address=${vm_external_ip}" params+=" --ssh-user=${PROXY_SSH_USER}" params+=" --ssh-keyfile=/etc/srv/sshproxy/.sshkeyfile" <del> else [ -n "${MASTER_ADVERTISE_ADDRESS:-}" ] </del> <ins> elif [ -n "${MASTER_ADVERTISE_ADDRESS:-}" ]; then </ins> params="${params} --advertise-address=${MASTER_ADVERTISE_ADDRESS}" fi

Related discussion:
text: NAME ZONE MACHINETYPE PREEMPTIBLE INTERNALIP EXTERNAL_IP STATUS kubernetes-master us-central1-b n1-standard-1 10.128.0.2 104.197.149.96 RUNNING == Waiting for new master to respond to API requests == ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
That sounds long to me. Do you see the same behavior when you run it without the flag?
Tried it without the flag. No change. $ v1.5.0-beta.1 == Pre-Upgrade Node OS and Kubelet Versions == name: "kubernetes-master", osImage: "Google Container-VM Image", kubeletVersion: "v1.4.7-beta.0.2+-dirty" name: "kubernetes-minion-group-7kpl", osImage: "Debian GNU/Linux 7 (wheezy)", kubeletVersion: "v1.4.7-beta.0.2+-dirty" name: "kubernetes-minion-group-l2on", osImage: "Debian GNU/Linux 7 (wheezy)", kubeletVersion: "v1.4.7-beta.0.2+-dirty" name: "kubernetes-minion-group-lzgi", osImage: "Debian GNU/Linux 7 (wheezy)", kubeletVersion: "v1.4.7-beta.0.2+-dirty" Your active configuration is: [default] Project: rkouj-test1 Zone: us-central1-b INSTANCEGROUPS=kubernetes-minion-group NODENAMES=kubernetes-minion-group-7kpl kubernetes-minion-group-l2on kubernetes-minion-group-lzgi == Upgrading master to ''. Do not interrupt, deleting master instance. == Trying to find master named 'kubernetes-master' Looking for address 'kubernetes-master-ip' Using master: kubernetes-master (external IP: 23.236.62.71) Deleted []. WARNING: You have selected a disk size of under [200GB]. This may result in poor I/O performance. For more information, see: Created [].