Public bug reported:
[ Impact ]
NBD users who want to use /etc/nbdtab will face issues when trying to
start the NBD Client. Trying to use the `systemd` service also doesn't
work.
[ Test Plan ]
Inside a Noble VM (not a container):
# apt update
# apt install -y nbd-client nbd-server
# modprobe nbd
# truncate -s 1T /vol-0.img
# cat > /etc/nbd-server/conf.d/exports.conf << _EOF_
[vol0]
exportname = /vol-0.img
_EOF_
# systemctl restart nbd-server.service
Verify that NBD is working properly:
# nbd-client localhost /dev/nbd0 -name vol0
It should work.
To clean it up:
# nbd-client -d /dev/nbd0
Now, trigger the problem:
# cat >> /etc/nbdtab << _EOF_
nbd0 localhost vol0
_EOF_
# nbd-client nbd0
You should see the error:
# nbd-client nbd0
Error: Socket failed: Connection refused
Further attempts with `systemd` also fail:
# systemctl restart nbd@nbd0
Job for nbd@nbd0.service failed because the control process exited with error
code.
See "systemctl status nbd@nbd0.service" and "journalctl -xeu nbd@nbd0.service"
for details.
And the logs:
# journalctl -u nbd@nbd0.service -n 25
Apr 09 21:56:17 noble-nbd-1 systemd[1]: nbd@nbd0.service: Dependency
Before=dev-nbd0.device ignored (.device units cannot be delayed)
Apr 09 21:56:17 noble-nbd-1 systemd[1]: Starting nbd@nbd0.service - NBD client
connection for nbd0...
Apr 09 21:56:17 noble-nbd-1 nbd_client[5698]: Socket failed: Connection refused
Apr 09 21:56:17 noble-nbd-1 nbd-client[5698]: Error: Socket failed: Connection
refused
Apr 09 21:56:17 noble-nbd-1 nbd_client[5698]: Exiting.
Apr 09 21:56:17 noble-nbd-1 systemd[1]: nbd@nbd0.service: Main process exited,
code=exited, status=1/FAILURE
Apr 09 21:56:17 noble-nbd-1 systemd[1]: nbd@nbd0.service: Failed with result
'exit-code'.
Apr 09 21:56:17 noble-nbd-1 systemd[1]: Failed to start nbd@nbd0.service - NBD
client connection for nbd0.
** Affects: nbd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2060745
Title:
nbd-client fails to connect when using /etc/nbdtab on Ubuntu 24.04
(Noble)
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