[Unionfs] Diskless NFS with ubuntu

[Jason Straight]

I'm at wits end, if there's documentation somewhere for this lemme know, I've 
seen the hopless one.

Here's my problem:

I have a remote boot NFS setup that works fine if NFS is rw, but I want to 
make it ro and use unionfs overlay to have a writable root at each client 
station.

I've edited initrd to make a tmpfs in /tmpfs and mount nfs share to /root, 
then I create a unionfs with
mount -t unionfs -odirs=/tmpfs=rw:/root=ro unionfs /unionroot

then it finishes up and binds / to /unionroot. The system boots up with errors 
about permissions, apparently due to the fact that files in the union cannot 
be opened for append or copied/written over. Is there something I'm missing 
doing?

Thanks.

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