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Simba
n00b
Joined: 08 Nov 2002
Posts: 60
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 Posted: Fri Dec 16, 2005 12:42 am Post subject: How to use unionfs in initrd? |
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Hi,
Actually I want to use xen with unionfs so I can have a read only base file system and
read write delta filesystem. for this pupose I have to use initrd/initramfs so it can mount
this 2 filesystems with unionfs.
This is my simple linuxrc/init script:
| Code: |
#!/bin/sh
mount -t proc proc /proc
mount -t sysfs /sys /sys
/bin/busybox --install -s
/sbin/udevstart
modprobe unionfs
mount /dev/hda1 /mnt/basefs
mount /dev/hda2 /mnt/deltafs
mount -t unionfs -o dirs=/mnt/deltafs=rw:/mnt/basefs=ro none /mnt/unionfs
cd /mnt/unionfs
pivot_root . tmp/.initrd
exec /usr/sbin/chroot . /sbin/init
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It works fine after start, I have root union filesystem,
but I still have a problem with this script, I can't shutdown the system because
during the shutdown it tries to unmount /tmp/.initrd/mnt/basefs and /tmp/.initrd/mnt/deltafs
but this is not possible because the root filesystem is still using it.
Anyone can help me to solve this problem? or is there a working linuxrc script to use unionfs?
many thanks,
Simba |
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sirtalon42
Tux's lil' helper
Joined: 09 Aug 2005
Posts: 79
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| Posted: Fri Dec 16, 2005 3:14 am Post subject: |
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If this is for a DomU then it would be easier to use LVM & Copy-On-Write (create the device in Dom0, and pass it to the DomU as a disk).
On the UnionFS mailing list they discussed the problem you're having (except the person was using a Debian based system). I never saw the mail with the solution), its something to do with the OS forgetting that the union is mounted.
I think in your setup using cow may be easier (since you are using 2 differen't partitions) even for Dom0. |
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