Enable preemption on nomad scheduler

nomad/setup-cluster.yml

@@ -360,10 +360,6 @@
         state: started
         name: nomad
 
-- name: Bootstrap Nomad ACLs
-  hosts: nomad_instances
-
-  tasks:
     - name: Nomad API reachable?
       uri:
         url: "http://127.0.0.1:4646/v1/status/leader"
@@ -376,6 +372,11 @@
       changed_when: false
       run_once: true
 
+
+- name: Bootstrap Nomad ACLs and scheduler
+  hosts: nomad_instances
+
+  tasks:
     - name: Bootstrap ACLs
       command:
         argv:
@@ -408,6 +409,20 @@
       changed_when: false
       register: read_secretid
 
+    - name: Enable service scheduler preemption
+      command:
+        argv:
+          - nomad
+          - operator
+          - scheduler
+          - set-config
+          - -preempt-system-scheduler=true
+          - -preempt-service-scheduler=true
+      environment:
+        NOMAD_TOKEN: "{{ read_secretid.stdout }}"
+      delegate_to: "{{ play_hosts[0] }}"
+      run_once: true
+
     - name: Look for policy
       command:
         argv: