[ceph-users] Object storage multisite

Hello, I have two openstack installation on different sites. They do not share any service : each one have its keystone repository, and ceph cluster with object storage and block storage. I read about object storage multisite and I could modify my object storages to enable multisite active-active. I wonder if I can do it with two different keystone . How can I read containers on site B replicated by site A ? Ignazio