On Wed, Feb 11, 2009 at 11:09 AM, <sf...@users.sourceforge.net> wrote:
>
> Nitin Bhardwaj:
>> I think you misunderstood that the problem is with the /sysroot/bin
>> line of aufs in /etc/fstab. The problem is with /sysroot itself (
>> which eventually becomes / , after switch_root() call in the initrd ).
>> If we mount /sysroot as read-write ( as you suggest below, Step 1,
>> then rc.sysinit script runs a fsck on /, which fails because it was
>> mounted as read-write. Hence we need to mount /sysroot as read-only
>> only.
>
> Ok, then let's try tmpfs for aufs xino files.
>
> Assuming RHEL changes the root dir readwrite after fsck or something,
> :::
> mount -t ext3 /dev/hda1 /sysroot
> mount --ro -t squashfs /dev/hda2 /sysroot/.mount
> mount -t tmpfs tmpfs /sysroot/tmp
> for i in bin lib sbin usr
> do mount -t aufs -o xino=/sysroot/tmp/xino,br:/sysroot/$i:/sysroot/.mount/$i \
> aufs /sysroot/$i
> done
> mount -o remount,ro /sysroot
> :::
>
> There is no changes necessary /etc/fstab, I think.
>
>
> J. R. Okajima
>
Hi,
This is finally working with some tweaks :)
[...]
mount -t ext3 /dev/hda1 /sysroot
mount --ro -t squashfs /dev/hda2 /sysroot/.mount
mount -t tmpfs /sysroot/tmp /sysroot/tmp
mount -t aufs -o
xino=/sysroot/tmp/xino,br=/sysroot/bin:/sysroot/.mount/bin=ro
/sysroot/bin /sysroot/bin
[...]
mount -t ext3 -o remount,ro /dev/hda1 /sysroot
---------------------------------
But when I shutdown, I get following errors:
umount: /bin: Device or file system busy
umount: /sbin: Device or file system busy
umount: /lib: Device or file system busy
umount: /usr: Device or file system busy
I cannot change the umount in the halt script to umount -i, otherwise
it will get applied to *ALL* filesystem types, even non-aufs types.
So now, on every boot at filesystem check I get the following message:
/dev/hda1:Superblock last mount time is in future: FIXED
/dev/hda1:Superblock last mount time is in future: FIXED
/dev/hda1: clean .... [
OK ]
Should I be concerned about this ( from aufs internal workings point
of view)? Even though it gets "FIXED" on every boot ?
/proc/mounts contents are:
/dev/hda1 / ext3 rw,data=ordered 0 0
/dev/hda2 /.mount squashfs ro 0 0
/sysroot/tmp /tmp tmpfs rw 0 0
/sysroot/bin /bin aufs
rw,si=db7bc7c0,xino=/tmp/xino,br:/bin=rw:/.mount/bin=ro 0 0
[...]
Thanks,
Nitin.
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