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Description of problem:

For a while, libguestfs upstream has supported access to
guestfsd installed and running in Linux guests.  This lets
you modify live guests, which is normally not possible with
libguestfs.
(See: https://rwmj.wordpress.com/2011/07/06/libguestfs-live/#content )

However this feature isn't well tested and we shouldn't let
RHEL 6 users use it right now.

Therefore it should be disabled in the RHEL 6 packages that
we ship.

libguestfs-1.16.10-1.el6.x86_64, basic function for default mode "appliance" is ok, so fixed,  

><fs> set-attach-method unix:/tmp/guestfs
><fs> run
libguestfs: error: launch: In RHEL 6, only the 'appliance' method is supported.
In particular, "libguestfs live" is not supported.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
No Documentation needed

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-0774.html