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SubjectIs determining the virtual hostname for a process possible?
I've been virtual hosting a bunch of machines and I want to add some
special functionalities that, at this point, don't seem to be
possible, at least not with my current level of knowledge.

My biggest desire is to be able to have a single physical machine that
has two virtual domains and each of which has
a user with a shell account whos username is john (but each with
different uids).

that way mail could be sent to either and and Mr. John One could log into and see
his files and mail while Mr. John Two could log into and
see his mail and files but neither could interfere with the other.

Also if you telnetted to, getty would print...

Connected to
Escape character is '^]'. login:

instead of the real physical machines domain.

I don't know enough yet about kernel level stuff dealing with this but
I would think that maybe there is some way to do this with little or
no modifications to the kernel.

for instance NCSA's httpd and wuftpd can distinguish which domain is
using them and I guess this is done by information received from the
port connection. I would think that any process (such as getty) or
the children processes could trace themselves back to the
port/connection that they are originating from and determine what
their hostname should be.

thus is it possible (in some way or another) to configure linux so
that if you log in to a virtual domain and do a 'hostname' you would
get the virtual hostname or if you did it a 'who am i' it would also
give you the virtual hostname?

Could we keep with each process's info (where/what ever that is) the
IP address of the "machine" it is running on?

basically, in all, I would like to further segment a physical machine
into virtual machines with finer granularity than is now possible.

Can this be done or is there something fundamental that prevents this?

Please keep comments regarding sendmail aliasing as a solution to
yourselves as I already know and implement this and it is not enough.
especially when you get two clients whos name is bertrum and they both
want their login name to be bertrum on their "machine". Don't laugh...
it's not a hypothetical example for me. ugh :-)

- Jeff Wiegley

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