Add hostname role

When we bootstrap a server, properly setup /etc/hosts.

Change-Id: I265205f290d3fdc06d0b38aedaba9616cbe32520
Depends-On: https://review.openstack.org/648424
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

playbooks/bootstrap/roles/hostname/tasks/main.yaml

@@ -0,0 +1,24 @@
+# Copyright 2019 Red Hat, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+---
+- name: Set system hostname
+  become: true
+  hostname:
+    name: "{{ inventory_hostname.split('.', 1)[0] }}"
+
+- name: Create /etc/hosts
+  become: true
+  template:
+    dest: /etc/hosts
+    src: etc/hosts.j2

playbooks/bootstrap/site.yaml

@@ -28,6 +28,10 @@
       include_role:
         name: users
 
+    - name: Setup hostname role
+      include_role:
+        name: hostname
+
     - name: Setup swap role
       include_role:
         name: swap

playbooks/bootstrap/templates/etc/hosts.j2

@@ -0,0 +1,5 @@
+# This file is generated by Ansible
+#  DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
+#
+127.0.0.1 localhost
+{{ hostvars[inventory_hostname].ansible_host }} {{ inventory_hostname }} {{ inventory_hostname.split('.', 1)[0] }}