On Mon Apr 17, 2000 at 08:26:34PM +0200, A. Haumer wrote:
>
[-------snip--------]
> On our diskless clients we boot from the network and mount our root-fs
> from a NFS server read-only. The system is still a fully functional
[-------snip--------]
>
> Before we had devfs we couldnīt really solve the problem of having
> writable devicefiles on a readonly filesystem.
You do not need devfs for this at all. Just do something like the following.
Takes 100k of ramdisk (could use much less if you trim your device list to only
the devices you really need):
#!/bin/sh
echo -n "Building device ramdisk: "
SIZE=100
INODES=1200
dd if=/dev/zero of=/dev/ram1 bs=1k count=$SIZE > /dev/null 2>&1
mkfs.minix -n30 -i $INODES /dev/ram1 $SIZE > /dev/null 2>&1
mount /dev/ram1 /mnt -t minix -o rw > /dev/null 2>&1
cp -a /dev/* /mnt > /dev/null 2>&1
umount /dev/ram1 > /dev/null 2>&1
mount /dev/ram1 /dev -t minix -o rw > /dev/null 2>&1
echo "done."
Now you have a readonly root filesystem with writable devicefiles.
Apply similar methods to /tmp, /var, or wherever you need to write
stuff,
-Erik
--
Erik B. Andersen Web: http://www.xmission.com/~andersen/
email: andersee@debian.org
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