[ceph-users] why don't ceph daemon output their log to /var/log/ceph

Hi.all, when ceph run in container why not let ceph daemon output their log to /var/log/ceph, I build ceph image with ceph-container and deploy ceph via ceph-ansible. I found no logs under /var/log/ceph.why don't ceph daemon output logs to /var/log/ceph?