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我创建了两个drbd块设备，将drbd1作为os磁盘挂载到rootfs，drbd2计划在lxc中格式化。它在 ubuntu 16.04、lxc 2.x、drbd 8.4、centos6 上运行良好

升级以下软件后，lxc 仍然可以运行，但是drbd 设备没有出现在lxc 容器中。谁能给我一些建议？

# current config

host: ubuntu 20.04 server
lxc: 4.0.6
lxc container: centos7 
drbd version: 8.4
/usr/share/lxc/config/common.conf is using default version

common.conf 中的限制：

cgroup 限制 cgroup2 限制

drbd 块设备出现在主机上：

root@f1:/home/neo# lsblk
NAME                      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop1                       7:1    0 55.5M  1 loop /snap/core18/2246
loop2                       7:2    0 61.9M  1 loop /snap/core20/1169
loop3                       7:3    0 67.2M  1 loop /snap/lxd/21835
loop4                       7:4    0 32.3M  1 loop /snap/snapd/12704
loop5                       7:5    0 70.3M  1 loop /snap/lxd/21029
loop6                       7:6    0 32.5M  1 loop /snap/snapd/13640
loop7                       7:7    0 55.5M  1 loop /snap/core18/2253
loop8                       7:8    0 61.9M  1 loop /snap/core20/1242
sda                         8:0    0   32G  0 disk 
├─sda1                      8:1    0    1M  0 part 
├─sda2                      8:2    0    1G  0 part /boot
└─sda3                      8:3    0   31G  0 part 
  └─ubuntu--vg-ubuntu--lv 253:0    0   30G  0 lvm  /
sdb                         8:16   0   32G  0 disk 
└─nevg1-nelv1             253:1    0   32G  0 lvm  
  └─drbd1                 147:1    0   32G  0 disk /mnt/test.neo
sdc                         8:32   0   32G  0 disk 
└─nevg2-nelv2             253:2    0   32G  0 lvm  
  └─drbd2                 147:2    0   32G  0 disk

drbd 块设备不显示在 lxc 上：

neo@f1:~$ sudo lxc-attach -n test.neo
[root@test neo]# lsblk
lsblk: dm-1: failed to get device path
lsblk: dm-1: failed to get device path
lsblk: dm-2: failed to get device path
lsblk: dm-0: failed to get device path
lsblk: dm-2: failed to get device path
lsblk: dm-0: failed to get device path
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop1    7:1    0 55.5M  1 loop 
loop8    7:8    0 61.9M  1 loop 
sdb      8:16   0   32G  0 disk 
loop6    7:6    0 32.5M  1 loop 
loop4    7:4    0 32.3M  1 loop 
loop2    7:2    0 61.9M  1 loop 
sdc      8:32   0   32G  0 disk 
loop7    7:7    0 55.5M  1 loop 
sda      8:0    0   32G  0 disk 
|-sda2   8:2    0    1G  0 part 
|-sda3   8:3    0   31G  0 part 
`-sda1   8:1         1M  0 part 
loop5    7:5    0 70.3M  1 loop 
loop3    7:3    0 67.2M  1 loop

但是 /proc/partitions 显示 drbd 块设备

[root@test neo]# cat /proc/partitions | grep drbd
 147        1   33549276 drbd1
 147        2   33549276 drbd2

这是 lxc 配置：

lxc.net.0.type = phys
lxc.net.0.link = ens20
lxc.net.0.hwaddr = 66:79:48:3e:5b:b3
lxc.net.0.flags = up
lxc.net.0.ipv4.address = 172.20.6.25/24
lxc.net.0.ipv4.gateway = 172.20.6.1
lxc.net.0.name = eth0


lxc.net.1.type = veth
lxc.net.1.link = lxcbr0
lxc.net.1.hwaddr = fe:54:34:0f:3a:5d
lxc.net.1.flags = up
lxc.net.1.ipv4.address = 169.254.0.102/24
lxc.net.1.name = eth1

lxc.rootfs.path = /mnt/test.neo

lxc.include = /usr/share/lxc/config/common.conf

lxc.arch = x86_64
lxc.uts.name = test.neo
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