ceph-rgw: ability to bind civetweb on an IP

Introducing a new config option: `radosgw_civetweb_bind_ip` which points
to the `ansible_default_ipv4` by default. You can override this
variable. Use ansible facts to put a proper value.

Signed-off-by: Sébastien Han <seb@redhat.com>

defaults/main.yml

@@ -298,6 +298,7 @@ mds_use_fqdn: false # if set to true, the MDS name used will be the fqdn in the
 #radosgw_dns_name: your.subdomain.tld # subdomains used by radosgw. See http://ceph.com/docs/master/radosgw/config/#enabling-subdomain-s3-calls
 radosgw_frontend: civetweb # supported options are 'apache' or 'civetweb', also edit roles/ceph-rgw/defaults/main.yml
 radosgw_civetweb_port: 8080 # on Infernalis we get: "set_ports_option: cannot bind to 80: 13 (Permission denied)"
+radosgw_civetweb_bind_ip: "{{ ansible_default_ipv4 }}"
 radosgw_keystone: false # activate OpenStack Keystone options full detail here: http://ceph.com/docs/master/radosgw/keystone/
 #radosgw_keystone_url: # url:admin_port ie: http://192.168.0.1:35357
 radosgw_keystone_admin_token: password

templates/ceph.conf.j2

@@ -189,7 +189,7 @@ rgw socket path = /tmp/radosgw-{{ hostvars[host]['ansible_hostname'] }}.sock
 log file = /var/log/ceph/{{ cluster }}-rgw-{{ hostvars[host]['ansible_hostname'] }}.log
 rgw data = /var/lib/ceph/radosgw/{{ cluster }}-rgw.{{ hostvars[host]['ansible_hostname'] }}
 {% if radosgw_frontend  == 'civetweb' %}
-rgw frontends = civetweb port={{ radosgw_civetweb_port }}
+rgw frontends = civetweb port={{ radosgw_civetweb_bind_ip }}:{{ radosgw_civetweb_port }}
 {% endif %}
 {% if radosgw_keystone %}
 rgw keystone url = {{ radosgw_keystone_url }}