Support deployment of extra ceph.conf files

Currently, ceph_client role only deploys one ceph.conf
file to a hard-coded location of /etc/ceph/ceph.conf

Cinder is able to utilize multiple configs for Ceph
when using multiple Ceph clusters by defining the
variable rbd_ceph_conf in each rbd backend defined in
cinder_backends.

This patch allows a deployer to define the dictionary
variable ceph_extra_confs to deploy more ceph.conf files.

Change-Id: I1e8d1c6bb10915789ab4d08b5596844f01d2b8d7

doc/source/configure-ceph.rst

@@ -74,6 +74,21 @@ The example uses ``cephx`` authentication, and requires existing ``glance`` and
 
 .. _Deploying SSH Keys: targethosts-prepare.html#deploying-ssh-keys
 
+Extra client configuration files
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Deployers can specify extra Ceph configuration files to support
+multiple Ceph cluster backends via the ``ceph_extra_confs`` variable.
+
+.. code-block:: console
+
+    ceph_extra_confs:
+    -  src: "/opt/rdb-1.conf"
+       dest: "/etc/ceph/rdb-1.conf"
+    -  src: "/opt/rdb-2.conf"
+       dest: "/etc/ceph/rdb-2.conf"
+
+These config file sources must be present on the deployment host.
+
 Monitors
 ~~~~~~~~
 

releasenotes/notes/extra-ceph-conf-337b9371b49219ff.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - New variable ``ceph_extra_confs`` may be defined to support
+    deployment of extra Ceph config files.  This is useful for cinder
+    deployments that utilize multiple Ceph clusters as cinder backends.

tasks/ceph_config.yml

@@ -59,3 +59,16 @@
   tags:
     - ceph-config-create-config
 
+- name: Create extra ceph.conf files
+  copy:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    owner:  root
+    group:  root
+    mode:   0644
+  notify:
+  - Restart os services
+  with_items: "{{ ceph_extra_confs }}"
+  when: ceph_extra_confs is defined
+  tags:
+    - ceph-config-create-config