[ceph-users] native linux distribution host running ceph container ?

Hi, We have a containerised ceph cluster in version 16.2.4 (15 hosts, 180 osds) deployed with ceph-ansible. Our host run on centos 7 (kernel 3.10) with ceph-deamon docker image based on centos 8. I cannot find in the documentation which native distribution is recommended, should it be the same as docker image (centos 8) ? About centos8 and the end of support announced for the end of the year, which distribution will ceph use in docker image ? Thanks