Hello My upgrade from 15.2.12 to 16.2.4 is stuck because a mon daemon failed to upgrade. Systemctl status of the mon showed this error: Error: open /sys/fs/cgroup/cpuacct,cpu/system.slice/... It turns out there is no /sys/fs/cgroup/cpuacct,cpu directory on my system. Instead, I have /sys/fs/cgroup/cpu,cpuacct. Symlinking them appears to have solved the immediate problem, but if I proceed with the upgrade to 16.2.4, after reboot, all ceph daemons will probably fail to start. Is this an issue with ceph, podman (2.1.1), or the fact that I am running Centos7? Is it possible to upgrade from 15.2.12 to 16.2.4 on Centos7? I thought that installing a version of podman that is compatible with both would suffice, but apparently not... Vlad