Am Montag, 26. Dezember 2005 03:39 schrieb Jon LaBadie:
> On Mon, Dec 26, 2005 at 12:22:36AM +0100, Thomas Widhalm wrote:
> > Am Sonntag, 25. Dezember 2005 23:57 schrieb Jon LaBadie:
> > > On Sun, Dec 25, 2005 at 11:04:30PM +0100, Thomas Widhalm wrote:
> > > > Hi!
> > > >
> > > > I set up amanda to backup some of my workstations. Now I encountered
> > > > some strange issue: On one workstation amanda can backup /home but
> > > > not /. The permissions in /dev are the same. The user amanda is in
> > > > the disk group.
> > >
> > > What backup program are you using. For tar the device permissions
> > > should not matter. For dump they do.
> >
> > I have the option "program "GNUTAR" set.
> >
> > > Are the entries in /dev symlinks to some other file, the actual device?
> > > On some OSs they are. Does "ls -lL" (both lower and upper 'ell') of
> > > the devices give the same results as "ls -l"?
> >
> > Both ls's on the /dev/hda device and on the / directory show the same
> > output.
> >
> > Thanks for the hint but it didn't work out.
>
> You over looked this comment I made.
Sorry. I just wanted to exclude any possible reason for this error.
>
> > > For tar the device permissions should not matter.
>
> So I would not have expected anything else.
>
> For clarification, tar does not read the devices directly, dump does.
> Tar reads each and every individual file and directory. Thus some of
> amanda's programs must be owned by root and setuid. Not every program,
> just certain ones, including, but not limited to, the "runtar" program.
runtar and some other programs under /usr/lib/amanda belong to root:disk with
suid set. They have read and execute for the group set.
>
> Even this may not be sufficient. For example, if you are backing up
> remote mounted directories (nfs ...) root's privilege may be turned off.
> Or if you are running trusted solaris or other "secure" unix (eg. selinux),
> root may not have "all power".
I want to backup / and /home. Both are not nfs mounted, both are ext3 and
selinux is off. It's Tao Linux 4 (rebuild of RHEL 4). All works fine on any
other workstation. I just can't get / to get accessed by amanda. /home is no
problem. This is what I don't understand. I searched for differences between
those to devices rather long, but I didn't find any.
Maybe you have some more hints.
Thank you.
Regards,
Thomas
>
> >>> End of included message <<<
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