SSHFS ("SSH File System") is a system to let you mount anything on any machine that you can SSH to. To use it on Ubuntu:
$ sudo apt-get install sshfs $ sudo adduser <your_userid> fuse
You can install it on RHEL5/CentOS5 these directions. You don't even have to be root to use it (provided you are in the 'fuse' group, or you "chmod 777 /dev/fuse").
register$ mkdir mntpoint register$ sshfs break:/ mntpoint register$ ls mntpoint a boot etc initrd lib64 media mnt opt proc sbin srv t u var bin dev home lib lost+found misc net post-changes.tar root selinux sys tmp usr x register$ echo something > mntpoint/etc/yp.conf bash: mntpoint/etc/yp.conf: Permission denied
Neat, but what if we want root access to that system? Well, you can do:
register$ sshfs root@break:/ mntpoint
You'll need the root password to that last bit.
You can go all crazy and mount a bunch of stuff at once:
pac00# for A in `seq 0 9`; do mkdir pac0$A ; sshfs pac0$A:/ pac0$A ; done
That will make a directory for pac00 .. pac09 and mount that system's root there. Then you could go nuts with some scripts to modify each system.
Because this works on any system you can SSH to, it cuts through NAT routers and firewalls, and you can mount almost any OS, including: