[GIS.lab] chroot

[Ludmila Furtkevicova]

HI,

many thanks for really clear explanation! Root was obvious but chroot not
[1]
Thanks.

Ludka



[1] http://gislab-documentation.readthedocs.org/en/latest/_images/backup.svg


2016-04-21 23:55 GMT+02:00 Matej Pastor <matej.pastor at initipi.sk>:

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> Dňa Wed, 20 Apr 2016 15:32:12 +0200
> Ludmila Furtkevicova <ludmilafurtkevicov at gmail.com> napísal/a:
>
> > Hi,
> >
> > Is there any difference when I say `client's root` or `chroot`? I suppose
> > that `client's chroot`
> > is not the best expression - many times used in GIS.lab wiki.
> > Or am I wrong?
> > What should I use to be correct in GIS.lab materials? E.g. when talking
> > about image and client's root backup ..
> >
> > Thanks ..
> >
> > Ludmila
>
> "client's root" is concrete directory (on gis.lab server) in which gis.lab
> client
> is installed (with a special tool named 'debootstrap'). it has almost same
> filesystem
> hierarchy as a standard xubuntu desktop installation with our gis.lab
> integration
> changes (and this is what you see in running gis.lab client). from this
> directory
> is then created gis.lab client image. this image is mounted (over network)
> as a "client's root partition" during boot process.
>
> chroot (from wikipedia :)):
>
> "A chroot on Unix operating systems is an operation that changes the
> apparent root directory
> for the current running process and its children. A program that is run in
> such a modified environment
> cannot name (and therefore normally cannot access) files outside the
> designated directory tree."
>
> if you want to e.g. install new package in client, you must do it in
> "client's chroot".
> 'chroot' is a tool which enable it:
>
>     chroot /path/to/client/root/directory apt-get install firefox
>
> this command install firefox to client's root within chroot :)
>
> very simple comparision: 'root' is a directory and 'chroot' is an
> operation.
>
> - --
> Matej Pastor
> email: matej.pastor at initipi.sk
> gpg: http://www.initipi.sk/gpg/matej.pastor_initipi.sk.gpg
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