Autoscaling EC2 with NFS mounts

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http://serverfault.com – I'm trying to set up a shares filesystem on EC2 and I've read tutorials such as this: http://blog.ronaldmccollam.com/2012/07/configuring-nfs-on-ubuntu-in-amaz... In step 2 it talks about configuring the exports, for this I need an IP range but when I'm auto-scaling I can't predict what the IP will be before it scales. Is there any other way of doing this while still staying secure? Thanks Edit: Just tried s3fs, didn't seem to work properly (HowTos)