Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!mcvax!ukc!etive!hwcs!zen!vic
From: vic@zen.co.uk (Victor Gavin)
Newsgroups: comp.sys.hp
Subject: Re: Backup over net (Was Re: NFS Super users?)
Message-ID: <1649@zen.co.uk>
Date: 19 Jul 89 10:47:44 GMT
References: <2924@helios.ee.lbl.gov> <240042@grlab.UUCP>
Reply-To: vic@zen.co.uk (Victor Gavin)
Organization: Zengrange Limited, Leeds, England
Lines: 54

In article <240042@grlab.UUCP> scott@grlab.UUCP (Scott Blachowicz) writes:
>/ grlab:comp.sys.hp / vic@zen.co.uk (Victor Gavin) /  7:30 am  Jul  1, 1989 /
>>This is only because HP runs an old version of NFS. In the newer versions, the
>>exports file describes how to map the root id when access is made to files on
>>that file system from specific machines.
>Maybe I'll wait for that...which version(s) of HP-UX?

Only HP know when they'll support the newer versions. But don't hold your
breath :-)

>>HP don't support rdump!
>Would/will it support REMOTE FILES to be backed up to a LOCAL TAPE DRIVE? What
>I'm trying to do is get files off of 2 systems onto 1 backup. (backup my
>home directory and some other people's plus some other stuff spread
>across 2 systems).

Rdump -- and correct me if I'm wrong -- doesn't allow you to store file
systems for different (remote) machines onto the same tape

If you have ``access'' to the remote files that you want to back up then you
can use something like 

  "find <nominiated file systems> -depth -print | cpio -oacxBC > /dev/rmt/0h"

This is where the changing of the kernal's map of UID 0 to nobody becomes
useful. To do this just

	adb -w /hp-ux
	nobody ?W 0
	$q

The problem is that now root on any machine can access all the files on the
machine that uses this kernal. Of course this b*ggers up security no end.

What the newer versions of NFS allow, is for you to specify when you export a
file system, which machines can have root access to that file system

eg On our Sun machine we have this line to allow our 840 to back up its /
directory

	      / -access=zen:zenvec,root=zen

(-access specifies which machines can access the file system and
-root says which machines have root capability on that file system)

>Thanx,
>Scott Blachowicz    scott@grlab.UUCP

			vic
--
Victor Gavin						Zengrange Limited
vic@zen.co.uk						Greenfield Road
..!mcvax!ukc!zen.co.uk!vic				Leeds England
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