Run compute upgrade only in compute hosts.

The basic deployment used in TripleO CI
with only a controller is displaying
the controller in the openstack hypervisor
list command and tries running
upgrade-non-controller.sh on it, which fails.

With this change we plan to filter out
only those hosts with the compute role, leaving
aside those hosts in which nova-scheduler and
nova-compute are running at the same time.

Closes-Bug: #1747432
Change-Id: If7bfd63d62509387be4b843d470816365f68cfaf

tasks/upgrade/compute_detect.yml

@@ -0,0 +1,25 @@
+- name: list hypervisors in overcloud
+  shell: |
+    source {{ overcloud_rc }}
+    openstack hypervisor list -f json | jq -r -c '.[] | .["Hypervisor Hostname"]'
+  register: hypervisors
+
+- name: hosts running nova-compute
+  shell: |
+    source {{ overcloud_rc }}
+    openstack compute service list --service nova-compute -c Host -f value
+  register: nova_compute_hosts
+
+- name: hosts running nova-scheduller
+  shell: |
+    source {{ overcloud_rc }}
+    openstack compute service list --service nova-scheduler -c Host -f value
+  register: nova_scheduler_hosts
+
+- name: controller hosts acting as all-in-one
+  set_fact:
+    all_in_one: "{{ nova_compute_hosts.stdout_lines | default([]) | intersect(nova_scheduler_hosts.stdout_lines | default([])) }}"
+
+- name: Filter out only compute nodes
+  set_fact:
+    compute_nodes: "{{ hypervisors.stdout_lines | default([]) | difference(all_in_one) }}"

tasks/upgrade/compute_upgrade.yml

@@ -1,10 +1,6 @@
-- name: list compute nodes
-  shell: |
-    source {{ overcloud_rc }}
-    openstack hypervisor list -f json | jq -r -c '.[] | .["Hypervisor Hostname"]'
-  register: hypervisors
+- include: compute_detect.yml
 
 - include: node_upgrade.yml
-  with_items: "{{ hypervisors.stdout_lines }}"
+  with_items: "{{ compute_nodes }}"
   loop_control:
     loop_var: node_name

tasks/upgrade/node_upgrade_script.yml

@@ -1,17 +1,15 @@
 ---
-- block:
-    - name: register instances running on {{ node_name }}
-      shell: |
-        source {{ overcloud_rc }}
-        openstack server list --host {{ node_name }} -f json | jq -r -c '.[] | select(.Status | contains("ACTIVE") or contains("PAUSED")) | .Name'
-      register: node_instances
+- name: register instances running on {{ node_name }}
+  shell: |
+    source {{ overcloud_rc }}
+    openstack server list --host {{ node_name }} -f json | jq -r -c '.[] | select(.Status | contains("ACTIVE") or contains("PAUSED")) | .Name'
+  register: node_instances
 
-    - name: create pre upgrade script for {{ node_name }}
-      template:
-        src: node_upgrade_pre.sh.j2
-        dest: "{{working_dir}}/{{ node_name | splitext | first | splitext | first }}_upgrade_pre.sh"
-        mode: 0775
-  when: "node_name in hypervisors.stdout_lines"
+- name: create pre upgrade script for {{ node_name }}
+  template:
+    src: node_upgrade_pre.sh.j2
+    dest: "{{working_dir}}/{{ node_name | splitext | first | splitext | first }}_upgrade_pre.sh"
+    mode: 0775
 
 - name: create script for upgrading {{ node_name }}
   template:

tasks/upgrade/non_controller_upgrade_scripts.yml

@@ -1,18 +1,14 @@
-- name: register compute nodes
-  shell: |
-    source {{ overcloud_rc }}
-    openstack hypervisor list -f json | jq -r -c '.[] | .["Hypervisor Hostname"]'
-  register: hypervisors
-
 - name: register swift storage nodes
   shell: |
     source {{ undercloud_rc }}
     openstack server list -f json |  jq -r -c '.[] | select(.Name | contains("swift") or contains("objectstorage")) | .Name'
   register: swift_nodes
 
+- include: compute_detect.yml
+
 - include: node_upgrade_script.yml
   loop_control:
     loop_var: node_name
   with_items:
-    - "{{ hypervisors.stdout_lines }}"
+    - "{{ compute_nodes }}"
     - "{{ swift_nodes.stdout_lines }}"