Created attachment 1079403 [details]
failed stack update

Description of problem:
I am trying to add an additional compute node to an overcloud where I've previously run 'openstack overcloud update stack' and the stack-update seems to eventually timeout and the heat stack ends up with UPDATE_FAILED status. 

Version-Release number of selected component (if applicable):
openstack-tripleo-heat-templates-0.8.6-71.el7ost.noarch

How reproducible:
100%

Steps to Reproduce:
1. Run initial deployment:

openstack overcloud deploy --templates ~/templates/my-overcloud -e ~/templates/my-overcloud/environments/network-isolation.yaml -e ~/templates/network-environment.yaml --control-scale 3 --compute-scale 1 --ntp-server 10.5.26.10 --libvirt-type qemu  -e ~/templates/firstboot-environment.yaml

2. Run packages update:
openstack overcloud update stack --templates ~/templates/my-overcloud -i overcloud

3. Try to add aditional compute
openstack overcloud deploy --templates ~/templates/my-overcloud --control-scale 3 --compute-scale 2 --ntp-server 10.5.26.10 --libvirt-type qemu 

Actual results:
The additional node gets provisioned but the stack update gets stuck and it eventually fails. 

Expected results:
The stack successfully gets updated and the additional compute node is ready to use.   

Additional info:
Attaching output of heat resource-list  and heat stack-list.