--- fixes: - | Fixes IPv6 deployment on CentOS 7. The issues with RabbitMQ and MariaDB have been worked around. For details please see the following Launchpad bug records: `bug 1848444 <https://bugs.launchpad.net/kolla-ansible/+bug/1848444>`__, `bug 1848452 <https://bugs.launchpad.net/kolla-ansible/+bug/1848452>`__, `bug 1856532 <https://bugs.launchpad.net/kolla-ansible/+bug/1856532>`__ and `bug 1856725 <https://bugs.launchpad.net/kolla-ansible/+bug/1856725>`__.