Public bug reported:
In /etc/init.d/nbd-client, I don't see any way that would permit me to
use an nbd-mounted root filesystem and have a clean shutdown process.
With the current code, "rmmod nbd" is executed and then the client gets
a bunch of read errors instead of shutting down.
Test case:
* In /etc/nbd-server/config on the server, I export a whole partition with an
OS in it:
[generic]
[sda2]
exportname = /dev/sda2
port = 10809
* In pxelinux.cfg/default on the server, I pass these kernel parameters to
netboot a client:
APPEND ro initrd=nbdclient/initrd.img root=/dev/nbd0 nbdroot=10.160.31.14,10809
ip=10.160.31.101:10.160.31.1:10.160.31.1:255.255.255.0:nbd101:eth0:none
* In the client /etc/network/interfaces (i.e. in /dev/sda2), I put a
"manual eth0" to prevent network manager to break the existing
connection.
Then I need the following 2 workarounds so cleanly shutdown:
1) In the client /etc/fstab, I put the following *commented* entry, just to
prevent /etc/init.d/nbd-client from unmounting the root filesystem on shutdown.
Some documentation for a better way to do that would be appreciated:
#/dev/nbd0 / ext4 _netdev,errors=remount-ro 0 1
2) In the client /etc/init.d/nbd-client, I move the marked "if" after the
rmmod command:
if [ "$KILLALL" != "false" ]
then
if [ -d /dev/nbd ]
then
DEVICES=/dev/nbd/*
else
DEVICES=/dev/nb*
fi
- fi
echo "Invoking swapoff on NBD devices..."
swapoff $DEVICES 2>/dev/null
echo "Disconnecting $DESCes..."
for i in $DEVICES
do
$DAEMON -d $i 2>/dev/null >/dev/null
done
rmmod nbd
+ fi
Is there any better way to make nbd-mounted root filesystems shutdown properly?
** Affects: nbd (Ubuntu)
Importance: Undecided
Status: New
--
Unable to cleanly shutdown with an nbd root filesystem
https://bugs.launchpad.net/bugs/682328
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