RedHat: Use the distribution package

The RDO repository provids a rabbitmq-server which is tested by the
RDO team so we should use that instead of the external one. We also
skip several tasks which add gpg keys and external repositories
since none of these steps is necessary when we install packages
from the distro repos.

Change-Id: I7c0a988f3aab14042ac2491b1021e789ba9ef4b3

tasks/install_yum.yml

@@ -41,6 +41,8 @@
       tags:
         - rabbitmq-gpg-keys
 
+  when: rabbitmq_install_method != 'distro'
+
 - name: Install RabbitMQ yum mirror
   yum_repository:
     name: "{{ rabbitmq_repo.name }}"
@@ -81,6 +83,8 @@
       --enable {{ item.name }}
       --setopt="{{ item.name }}.priority={{ item.priority }}"
   changed_when: false
+  when:
+    - rabbitmq_install_method != 'distro'
   with_items:
     - name: "{{ rabbitmq_repo.name }}"
       priority: 40
@@ -132,3 +136,27 @@
   tags:
     - rabbitmq-package-rpm
     - rabbitmq-yum-packages
+
+# NOTE(hwoarang) on RedHat, rabbitmq-server depends on epmd.service which
+# depends on epmd.socket which runs on localhost. It is just easier to let
+# the rabbitmq-server launch epmd directly since we are inside a container.
+- name: Add rabbitmq-server systemd service (RedHat)
+  template:
+    src: "rabbitmq-server.service.j2"
+    dest: "/etc/systemd/system/rabbitmq-server.service"
+  register: rabbitmq_server_service_added
+  # NOTE(hwoarang) Normally, this task should only be executed when
+  # rabbitmq_install_method == 'distro'. However, the upstream package
+  # does not contain a systemd file and as such we need to provide one.
+  # This should be reverted once https://github.com/rabbitmq/rabbitmq-server-release/pull/31
+  # is merged and new builds of rabbimq-server are available.
+  tags:
+    - rabbitmq-config
+
+- name: Reload the systemd daemon
+  systemd:
+    daemon_reload: yes
+  when:
+    - rabbitmq_server_service_added is changed
+  tags:
+    - rabbitmq-config

vars/redhat.yml

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-_rabbitmq_install_method: external_repo
+_rabbitmq_install_method: distro
 _rabbitmq_package_url: "https://packagecloud.io/rabbitmq/rabbitmq-server/packages/el/7/rabbitmq-server-3.7.5-1.el7.noarch.rpm/download.rpm"
 _rabbitmq_package_version: "{{ rabbitmq_package_url.split('/')[-2].rsplit('.', 1)[0] }}"
 _rabbitmq_release_version: "{{ rabbitmq_package_version.split('-')[2] }}"