another problem! MPICH

Eric Linenberg elinenbe at umich.edu
Sat Aug 4 13:11:11 EDT 2001


I still can't figure it out.  It works okay right now for any other user 
other then root, but I relly need ti to work for root too.  Is there any way 
that I can go about to get 'rsh host command' to work for the root?  By the 
way I am running Red Hat 7.1

thanks,
eric

> --- Martin Siegert <siegert at sfu.ca> wrote:
> > On Fri, Aug 03, 2001 at 08:04:01PM -0400, Eric
> >
> > Linenberg wrote:
> > > okay an update here:
> > >
> > > I can rsh into a machine without using a password,
> > > eg rsh snickers, but if I do a "rsh snickers
> >
> > date", then I get a permission
> >
> > > denied error.
> > >
> > > the thing is I when I built mpich i did
> >
> > ./configure -rsh=ssh so this should
> >
> > > not be an issue.   But if it is how is one to fix
> >
> > it?  On the other hand if I
> >
> > > do a "ssh snickers date" this works perfectly.
> >
> > Here are a few tips for rsh:
> >
> > # rsh <hostname>
> >
> > is equivalent to
> >
> > # rlogin <hostname>
> >
> > i.e., the settings/permissions for rlogin (not for
> > rsh) are used! Only
> >
> > # rsh <hostname> <command>
> >
> > uses the settings/permissons for rsh.
> > Hence, to have the latter working without passwords
> > you need something like
> >
> > in.rshd : 192.168.1.
> >
> > in your /etc/hosts.allow file (assuming that you
> > have "ALL : ALL" in
> > /etc/hosts.deny and assuming that you are using the
> > 192.168.1.0
> > network for communication/MPI) and the "shell" line
> > - not the login line -
> > must be enabled in /etc/inetd.conf. If you are using
> > xinetd instead you
> > must enable rsh in /etc/xinetd.d/rsh (and not in
> > /etc/xinetd.d/rlogin)
> > Furthermore, I prefer not to use .rhosts files
> > (because they must be setup
> > for every user), but enter all cluster nodes in
> > /etc/hosts.equiv on all nodes.
> >
> > [I am assuming here that your nodes are on a private
> > network like
> > 192.168.1.0 or 172.16.0.0, etc. without
> > ip-forwarding and similar; if they
> > are not, setting up rsh without passwords is a huge
> > security risk].
> >
> > Depending on your distribution (e.g., whether you
> > are using inetd or xinetd)
> > you also may have to change settings in
> > /etc/xinetd.conf, /etc/xinetd.d/rsh,
> > /etc/securetty, /etc/pam.d/rsh.
> >
> > Also, if you want to use rsh without passwords as
> > root different rules
> > apply (e.g., rsh as root ignores root's .rhost file
> > and rsh as root
> > under RH7.1 only works when you add "rsh" to
> > /etc/securetty - see the
> > little comment in /etc/pam.d/rsh).
> >
> > I hope this helps. You may also want to check the
> > error messages in
> > /var/log/messages and /var/log/secure (or whatever
> > your distro is using) -
> > they sometimes give you a hint which program (tcpd,
> > pam, etc.) is refusing
> > access.
> >
> > Cheers,
> > Martin
>
> ========================================================================
>
> > Martin Siegert
> > Academic Computing Services
> > phone: (604) 291-4691
> > Simon Fraser University
> > fax:   (604) 291-4242
> > Burnaby, British Columbia
> > email: siegert at sfu.ca
> > Canada  V5A 1S6
>
> ========================================================================
>
>
>
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