Proxmox PVE7 Centos7 Container启动异常，报错如下：

WARN: old systemd (< v232) detected, container won’t run in a pure cgroupv2 environment! Please see documentation -> container -> cgroup version.

根本原因是cgroup的兼容性问题。官方描述如下：

官方也给出了处理办法：

Changing CGroup Version
If file system quotas are not required and all containers support cgroupv2, it is recommended to stick to the new default.

systemd.unified_cgroup_hierarchy=0

处理过程如下：
1.修改启动参数/etc/default/grub

2.使配置生效平重启

update-grub
reboot