Tobias McNulty:
> echo "Mounting server_root"
> mount -o nolock,tcp,ro $SERVER:/ /mnt/server_root
> 
> echo "Mounting client_overlay"
> mount -o nolock,tcp,ro $SERVER:/client/overlay /mnt/client_overlay
        :::
> echo "Mounting union"
> mount -t unionfs -o dirs=/mnt/client_overlay=rw:/mnt/server_root=rw none 
> /mnt/final_root

Try mount /mnt/{server_root,client_overlay} without 'ro' option,
or mount /mnt/final_root with '=nfsro' branch permission instead of
'=rw'.

But if you mount /mnt/client_overlay as readonly, you cannot
create/modify any files. Probably you should,,,
- export $SERVER:/client/overlay as writable
- mount -o ro /mnt/server_root
- mount -o rw /mnt/client_overlay
- mount -o dirs=/mnt/client_overlay=rw:/mnt/server_root=nfsro none 
/mnt/final_root


Junjiro Okajima
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