Cannot use lxd after update linux kernel

LXD
1

I have just update linux kernel version from 5.4.0 to 5.8.0 and reboot my linux server.
After that, it seems i cannot use lxd/lxc anymore.

~> lxc list
Error: Get "http://unix.socket/1.0": dial unix /var/snap/lxd/common/lxd/unix.socket: connect: connection refused

How can I fix it?

2

Can you look at journalctl -u snap.lxd.daemon -n 30 or any relevant errors?

3

Thank you for the prompt reply.

~> journalctl -u snap.lxd.daemon -n 30
-- Logs begin at Sun 2021-12-19 16:25:01 CST, end at Wed 2022-03-09 14:39:12 CST. --
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]:  12: fd:  19: rdma
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: Kernel supports pidfds
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: Kernel supports swap accounting
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: api_extensions:
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - cgroups
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - sys_cpu_online
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_cpuinfo
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_diskstats
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_loadavg
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_meminfo
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_stat
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_swaps
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - proc_uptime
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - shared_pidns
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - cpuview_daemon
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - loadavg_daemon
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: - pidfds
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[4223]: Reloaded LXCFS
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[6979]: t=2022-03-09T11:26:24+0800 lvl=warn msg=" - Couldn't find the CGroup b>
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[6979]: t=2022-03-09T11:26:24+0800 lvl=eror msg="Failed to start the daemon" e>
3月 09 11:26:24 ubuntu-PowerEdge lxd.daemon[6979]: Error: Failed initializing storage pool "default": Error loading "zfs">
3月 09 11:26:25 ubuntu-PowerEdge lxd.daemon[6728]: => LXD failed to start
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: snap.lxd.daemon.service: Main process exited, code=exited, status=1/FAILURE
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: snap.lxd.daemon.service: Failed with result 'exit-code'.
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: snap.lxd.daemon.service: Scheduled restart job, restart counter is at 6.
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: Stopped Service for snap application lxd.daemon.
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: snap.lxd.daemon.service: Start request repeated too quickly.
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: snap.lxd.daemon.service: Failed with result 'exit-code'.
3月 09 11:26:25 ubuntu-PowerEdge systemd[1]: Failed to start Service for snap application lxd.daemon.
3月 09 11:58:57 ubuntu-PowerEdge systemd[1]: snap.lxd.daemon.service: Unit cannot be reloaded because it is inactive.
4

Looks like your new kernel lacks zfs support.

5

Ok, looks like I need to roll back the kernel version and re-upgrade properly.