split out head/compute diag roles, collect diag on head node
diff --git a/cord-diag-playbook.yml b/cord-diag-playbook.yml
index 2adf726..3e7a157 100644
--- a/cord-diag-playbook.yml
+++ b/cord-diag-playbook.yml
@@ -1,7 +1,24 @@
 ---
 # Collects diagnostic information for the currently running cord-pod config
 
+- name: Create diag_dir fact
+  set_fact: diag_dir="~/diag-{{ ansible_date_time.iso8601_basic_short }}"
+
 - name: Diagnostics on head node
   hosts: head
   roles:
     - head-diag
+
+- name: Diagnostics on compute nodes
+  hosts: compute
+  roles:
+    - compute-diag
+
+- name: Collect compute node diagnostics on head node
+  hosts: compute
+  synchronize:
+    src: "{{ diag_dir }}"
+    dest: "{{ diag_dir }}"
+    recursive: yes
+  delegate_to: "{{ groups['head'][0] }}"
+
diff --git a/inventory/single-localhost b/inventory/single-localhost
index 36fdcaa..5b70063 100644
--- a/inventory/single-localhost
+++ b/inventory/single-localhost
@@ -7,3 +7,6 @@
 [cloudlab]
 localhost
 
+[compute]
+nova-compute-1
+
diff --git a/roles/compute-diag/tasks/main.yml b/roles/compute-diag/tasks/main.yml
new file mode 100644
index 0000000..050c7c5
--- /dev/null
+++ b/roles/compute-diag/tasks/main.yml
@@ -0,0 +1,16 @@
+---
+# compute-diag/tasks/main.yml
+
+- name: Create diag_dir subdirs
+  file:
+    dest="{{ diag_dir }}/{{ inventory_hostname }}"
+
+- name: Compute node diag collection
+  shell: "{{ item }} > {{ diag_dir }}/{{ inventory_hostname}}/{{ item | regex_replace('[^\\w-]', '_')}}"
+  with_items:
+   - "arp -n"
+   - "brctl show"
+   - "cat /etc/resolv.conf"
+   - "ifconfig -a"
+   - "route -n"
+
diff --git a/roles/head-diag/tasks/main.yml b/roles/head-diag/tasks/main.yml
index 09e51a4..71723a2 100644
--- a/roles/head-diag/tasks/main.yml
+++ b/roles/head-diag/tasks/main.yml
@@ -1,9 +1,6 @@
 ---
 # head-diag/tasks/main.yml
 
-- name: Create diag_dir fact
-  set_fact: diag_dir="~/diag-{{ ansible_date_time.iso8601_basic_short }}"
-
 - name: Create diag_dir subdirs
   file:
     dest="{{ diag_dir }}/{{ item }}"
@@ -14,7 +11,6 @@
   - openstack
   - onos
   - xos
-  - nova-compute
 
 - name: Networking diag collection
   shell: "{{ item }} > {{ diag_dir }}/net/{{ item | regex_replace('[^\\w-]', '_')}}"
@@ -57,6 +53,7 @@
    - "cordvtn-nodes"
    - "cordvtn-node-check nova-compute-1"
    - "hosts"
+   - "dhcp-list"
 
 - name: XOS diag collection
   shell: "ssh ubuntu@xos-1 \"{{ item }}\" > {{ diag_dir }}/xos/{{ item | regex_replace('[^\\w-]', '_')}}"
@@ -65,21 +62,10 @@
    - "arp -n"
    - "ifconfig -a"
 
-- name: Copy and run XOS docker logs script
+- name: Copy/run/retrieve XOS docker logs
   command: "{{ item }}"
   with_items:
    - "scp {{ role_path }}/files/docker_logs.sh ubuntu@xos-1:~/docker_logs.sh"
    - "ssh ubuntu@xos-1 'bash ~/docker_logs.sh'"
-
-- name: XOS docker logs retrieval
-  command: "rsync -avP ubuntu@xos-1:~/docker_logs/ {{ diag_dir }}/xos/"
-
-- name: nova-compute diag collection
-  shell: "ssh ubuntu@nova-compute-1 \"{{ item }}\" > {{ diag_dir }}/nova-compute/{{ item | regex_replace('[^\\w-]', '_')}}"
-  with_items:
-   - "arp -n"
-   - "brctl show"
-   - "ifconfig -a"
-   - "ping -c 3 172.27.0.2"
-   - "route -n"
+   - "rsync -avP ubuntu@xos-1:~/docker_logs/ {{ diag_dir }}/xos/"