Re: [K12OSN] Re: [Ltsp-discuss] New LTSP + openMosix How-To

Hans Ekbrand (hans@sociologi.cjb.net)
Mon, 28 Oct 2002 10:44:44 +0100 


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On Sun, Oct 27, 2002 at 02:13:05PM +1300, Steve Wright wrote:
> little bark, BIG BYTE!! wrote:
> >1. Four servers distributed to four locations.=20

> >4. All locations are the same company and workers DO move from location
> >to location on occasion. (you can see what's coming can't you?)
> >5. Server specs . . . Asus dual proc board/2 x AMD 1800+, 2 Gigs Ram
> >(registered), 2 x 15000 RPM Segates, (fastest I've ever seen KDE come up
> >:-).
> >
> >What I'd like to do . . .=20
> >
> >1. Must be able for users to reach their desktop from any machine (in
> >four locations).

> Users' Desktops (their /home/* directories actually) need to be=20
> distributed, or put another way, mounted as a distributed filesystem.
>=20

Or kept in sync by other means, such as rsync over ssh.

> >2. It would be nice if access at each location was just as fast as
> >another.
> >
>=20
> No Problem. /home/ will be local to the server.

> >
> >so . . .
> >
> >1. Is their a clean way of keeping these boxes in sync across the
> >Internet? IPSec?
> >
>=20
>  You need a distributed filesystem !   
>=20
> >2. Do I need to keep them in sync? Mirrored?=20

Yes

> yes.
>=20
> I don't know much about 'best' - but Intermezzo uses http to sync the=20
> /home dirs together.  http ?  yup.  What's good about that ?  Security!
> How many security mechanisms do you know of for the apache webserver ?=20
> 8-)  uh huh, lots.  Just use https...  8-)  ipsec it all if you want,=20
> but there's no need..
>=20
> aaaand, how easy will it be to securely poke http through your firewall=
=20
> ?  trivial..
> how easy to secure apache ?  trivial..
>=20
> There are still plenty of gotcha's, and intermezzo is not exactly plug=20
> and play, *and* ....  There's plenty to learn yet, like you need to also=
=20
> sync all your UIDs, GIDs, passwords etc..  NIS, or LDAP ?  Eric ?

If you choose a more traditional way and just rsync /home over ssh it
can be as simple as a little script called from cron. You don't NEED
to sync UID, GIDs, passwords etc (that might be what you want, but it
is not required). As long as every user is just logged in at one
server at a time you just have to sync more often than they change
workplace (login server). /home /etc/passwd/ /etc/shadow
/etc/group might be what you want synced.

--=20

Hans Ekbrand
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