I managed to come up with a workaround.
The following patch skips the entire ordinary NFS mounting procedure and
only replaces NBD with NFS in the ltsp scripts. That means that the root
folder will be a unionfs of /cow and /rofs, but /rofs is not mounted
with NBD but NFS.
The patch has to be applied to /usr/share/initramfs-
tools/scripts/ltsp_nbd inside the ltsp chroot, and in addition to that
the PXE configuration should look exactly look like the one for NBD,
i.e. the boot=nfs and nfsroot= options should *not* be given.
--- ltsp_nbd.bak 2010-01-05 15:32:43.232058101 -0500
+++ ltsp_nbd 2010-01-05 15:40:16.196557912 -0500
@@ -27,7 +27,7 @@
# NBD root mounting
mountroot()
{
- [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/nfs-top"
+ [ "$quiet" != "y" ] && log_begin_msg "Running /scripts/ltsp_nbd"
run_scripts /scripts/nfs-top
[ "$quiet" != "y" ] && log_end_msg
@@ -67,16 +67,7 @@
mount -t tmpfs tmpfs /cow
# mount the readonly root
- if nbd-client ${NBD_ROOT_SERVER} ${NBD_ROOT_PORT} /dev/nbd0 ; then
- eval $(fstype /dev/nbd0)
- if [ -z "$FSTYPE" ]; then
- echo "Warning: unable to detect filesystem, assuming squashfs."
- FSTYPE=squashfs
- fi
- mount -o ro -t $FSTYPE /dev/nbd0 /rofs
- else
- panic "Error: failed to connect to NBD server."
- fi
+ mount -o ro,nolock -t nfs ${NBD_ROOT_SERVER}:/opt/ltsp/i386 /rofs
# merge ro and rw filesystems
mount -t aufs -o dirs=/cow=rw:/rofs=ro aufs ${rootmnt}
--
/etc/init/mountall.conf fails when root is mounted using NFS instead of NBD
https://bugs.launchpad.net/bugs/485709
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