Allow flexibility in mysql backend for ceilometer

This fix adds possibility to configure external mysql database
backend with a different set of credentials, i.e. not requiring
external db admins to provide or match their passwords if
ceilometer user and database already are preconfigured.

Change-Id: Icb78e069770adcc6d2437caca173a5852177178f
Closes-Bug: #1638238

ansible/roles/ceilometer/defaults/main.yml

@@ -7,9 +7,10 @@ project_name: "ceilometer"
 ####################
 ceilometer_database_name: "ceilometer"
 ceilometer_database_user: "ceilometer"
+ceilometer_database_port: "{{ mondodb_port if ceilometer_database_type == 'mongodb' else database_port }}"
 
-ceilometer_database_mongodb_address: "{% for host in groups['mongodb'] %}{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}:{{ mongodb_port }}{% if not loop.last %},{% endif %}{% endfor %}"
-ceilometer_database_mysql_address: "{{ kolla_internal_fqdn }}:{{ database_port }}"
+ceilometer_database_mongodb_address: "{% for host in groups['mongodb'] %}{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}:{{ ceilometer_database_port }}{% if not loop.last %},{% endif %}{% endfor %}"
+ceilometer_database_mysql_address: "{{ kolla_internal_fqdn }}:{{ ceilometer_database_port }}"
 
 
 ####################

ansible/roles/ceilometer/tasks/bootstrap.yml

@@ -10,11 +10,26 @@
   when:
     - ceilometer_database_type == "mongodb"
 
+- name: Checking Ceilometer mysql database
+  command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
+    -m mysql_db
+    -a "login_host='{{ ceilometer_database_mysql_address }}'
+        login_port='{{ ceilometer_database_port }}'
+        login_user='{{ ceilometer_database_user }}'
+        login_password='{{ ceilometer_database_password }}'
+        name='{{ ceilometer_database_name }}'"
+  register: mysql_access
+  failed_when: False
+  changed_when: False
+  run_once: True
+  when:
+    - ceilometer_database_type == "mysql"
+
 - name: Creating Ceilometer mysql database
   command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
     -m mysql_db
     -a "login_host='{{ ceilometer_database_mysql_address }}'
-        login_port='{{ database_port }}'
+        login_port='{{ ceilometer_database_port }}'
         login_user='{{ database_user }}'
         login_password='{{ database_password }}'
         name='{{ ceilometer_database_name }}'"
@@ -26,12 +41,13 @@
   delegate_to: "{{ groups['ceilometer-api'][0] }}"
   when:
     - ceilometer_database_type == "mysql"
+    - "'FAILED' in mysql_access.stdout"
 
 - name: Creating Ceilometer database user and setting permissions
   command: docker exec -t kolla_toolbox /usr/bin/ansible localhost
     -m mysql_user
     -a "login_host='{{ ceilometer_database_mysql_address }}'
-        login_port='{{ database_port }}'
+        login_port='{{ ceilometer_database_port }}'
         login_user='{{ database_user }}'
         login_password='{{ database_password }}'
         name='{{ ceilometer_database_name }}'
@@ -47,9 +63,11 @@
   delegate_to: "{{ groups['ceilometer-api'][0] }}"
   when:
     - ceilometer_database_type == "mysql"
+    - "'FAILED' in mysql_access.stdout"
 
 # TODO(Jeffrey4l): fix idempotent when ceilomter_database_type == "gnocchi"
+# NOTE(vbel): bootstrapping of mysql db for ceilometer is idempotent
 - include: bootstrap_service.yml
   when: ((ceilometer_database_type == "mongodb" and mongodb_ceilometer_database.changed)
-         or (ceilometer_database_type == "mysql" and mysql_ceilometer_database.changed)
+         or ceilometer_database_type == "mysql"
          or ceilometer_database_type == "gnocchi")