Merge "Remove /etc/hosts entries pointing hostname to localhost and prevent cloud-init to manage /etc/hosts"

ansible/roles/baremetal/tasks/pre-install.yml

@@ -16,6 +16,18 @@
   become: True
   when: customize_etc_hosts | bool
 
+# NOTE(mgoddard): Ubuntu includes a line in /etc/hosts that makes the local
+# hostname and nodename (if different) point to 127.0.1.1. This can break
+# RabbitMQ, which expects the hostname to resolve to the API network address.
+# Remove these troublesome entries.
+- name: Ensure hostname does not point to loopback in /etc/hosts
+  lineinfile:
+    dest: /etc/hosts
+    regexp: "^127.\\d+.\\d+.\\d+(\\s+{{ ansible_nodename }})?\\s+{{ ansible_hostname }}$"
+    state: absent
+  become: True
+  when: customize_etc_hosts | bool
+
 - name: Generate /etc/hosts for all of the nodes
   blockinfile:
     dest: /etc/hosts
@@ -35,6 +47,26 @@
     - inventory_hostname not in groups['bifrost'] or
       'ansible_' + hostvars[inventory_hostname]['api_interface'] in hostvars[inventory_hostname]
 
+# NOTE(osmanlicilegi): The distribution might come with cloud-init installed, and manage_etc_hosts
+# configuration enabled. If so, it will override the file /etc/hosts from cloud-init templates at
+# every boot, which will break RabbitMQ. To prevent this happens, first we check whether cloud-init
+# has been installed, and then set manage_etc_hosts to false.
+- name: Check whether cloud-init has been installed, and ensure manage_etc_hosts is disabled
+  block:
+    - name: Ensure /etc/cloud/cloud.cfg exists
+      stat:
+        path: /etc/cloud/cloud.cfg
+      register: cloud_init
+
+    - name: Disable cloud-init manage_etc_hosts
+      copy:
+        content: "manage_etc_hosts: false"
+        dest: /etc/cloud/cloud.cfg.d/99-kolla.cfg
+        mode: "0660"
+      when: cloud_init.stat.exists
+  become: True
+  when: customize_etc_hosts | bool
+
 - name: Ensure sudo group is present
   group:
     name: sudo