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Newsgroups: comp.unix.bsd.freebsd.misc Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!newshost.telstra.net!kettle.magna.com.au!news.cs.su.oz.au!harbinger.cc.monash.edu.au!simtel!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!EU.net!uknet!eldorado.net-tel.co.uk!usenet From: Andrew Gordon <andrew.gordon@net-tel.co.uk> Subject: Re: 2.0.5 -> NFS -> Linux: some files inaccessable X-Nntp-Posting-Host: evening-star.net-tel.co.uk Content-Type: text/plain; charset=us-ascii Message-ID: <DGntsC.LrM@net-tel.co.uk> To: jshiffle@netcom.com Sender: usenet@net-tel.co.uk (usenet poster) Content-Transfer-Encoding: 7bit Organization: NET-TEL Computer Systems Ltd References: <jshiffleDGMEJB.ME2@netcom.com> Mime-Version: 1.0 Date: Wed, 18 Oct 1995 19:50:35 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; PPC) X-Url: news:jshiffleDGMEJB.ME2@netcom.com Lines: 29 jshiffle@netcom.com (John Shifflett) wrote: >When I mount 2.0.5 partitions on a Linux machine (using NFS), files >and directories owned by root are not readable. Since my DAT drive is >on the Linux computer, I need _everything_ available through NFS so I >can make tape backups. (Yes, I'm mounting and attempting to read as >root). Is there something special I need to do to get this happening? This is normal NFS behaviour, in order to retain a vestige of security in the normal NFS case where the protocol is totally insecure. Since the protocol amounts to you simply saying who you are and the server trusting the answer (ignoring kerberos-based NFS authentication), it is regarded as simply too risky to trust arbitrary users who claim to be root. >(Other _Linux_ computers mounted via NFS don't have this limitation.) Linux is abnormal in this respect. The usual solution to the problem is to construct the tape archive on the machine where the disks are, and access the tape drive remotely - either using somthing sophisticated, or using 'rmt', or simply using somthing like: diskful_machine% tar cf - . | rsh tape_machine -l userid dd of=/dev/tape