random proxmox crash after upgrade to proxmox 7

[ilia987]

i upgraded entire cluster from proxmox 6.4 -> 7 with Ceph Nautilus->Octopus->Pacific

the problem: we few centos 7 lxc that we cannot upgrade to 8.
i used the workaround from one of the (post in this forum) and added

systemd.unified_cgroup_hierarchy=0

to the grub.

i applied it to two hosts in the cluster.

hosts randomly crash usually at least two at a time

*i think i saw once at a glance at the cluster HA tab, that those two servers have some time drifts at the Status tab ( but it might be due to the servers crashing or at process of booting up)

any idea how i can investigate or prevent it ?

 

[ilia987]

i found this?
look at first and last lrm
can it be the reason?

 

[ilia987]

i found the problem that cased the random reboots
chrony service was not installed on any of the upgraded proxmox servers, i had to manually install it on all of them.
since then there is no random crash, but there image from the post above still bothers me, some servers are out of sync with the time, and the lrm (marked in red)