Re: Red Hat user shopping around
On Thu, 2002-05-09 at 01:09, Glen Lee Edwards wrote:
> Ron writes:
> >
[snip]
> >A Debian policy-that-I-think-is-a-quirk: there is the the concept
> >of the meta-package. mail-transport-agent is an example. When,
> >for example, you install exim, mail-transport-agent is also
> >installed. If you want to install postfix to test it out, apt
> >will remove exim, since the exim & postfix packages are both
> >members of the same meta-package. It won't let me manage
> >inetd.conf to make sure that 2 different programs are combating
> >for the same port.
>
> Not sure I'm following what you mean. Are you trying to get inetd to read
> queries to the port, and based on the query determine which program to open? I
> don't think you can do that. Technically it's possible, but based on Internet
> standards my understanding is that specific ports are designed for specific
> programs (protocols). And trying to get inetd to pick between exim and postfix
> based on the incoming packets I would think would require a complete rewrite of
> inet.
>
> I may have totally missed what you're trying to say.
Must have. But, that's why I'm not a teacher! On mandrake (the
one I know), I can "rpm -ihv" exim and postfix. Of course, like
you say, 2 progs can't use the same port. So, I'd have 2 lines
in inetd.conf for smtp: one each for exim and postfix.
Then, I'd comment out, say, exim, and NOHUP inetd to run postfix.
So, I can run exim or postfix depending on what's commented out
in inetd.conf. No problem. Debian won't let you do that.
A beauty of the meta-package is that (staying with the MTA example),
if a package requires an MTA, but doesn't care _which_ MTA, the
package developer simply requires mail-transport-agent, instead of
exim|postfix|sendmail|blahblah. Also more flexible if someone
packages a new MTA. All he must do it add it as a member of
mail-transport-agent, instead of changing the requirements of each
package that requires an MTA.
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| Ron Johnson, Jr. Home: ron.l.johnson@cox.net |
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