Re: [Exim] Re: Very slow mailq with dial-up settings

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Autor: Philip Hazel
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A: Matej Cepl
CC: exim-users
Assumpte: Re: [Exim] Re: Very slow mailq with dial-up settings
On Tue, 29 Jul 2003, Matej Cepl wrote:

> ~$ uname -a
> Linux komensky 2.4.20 #2 Ne kvì 18 18:08:31 EDT 2003 i586 unknown
> ~$ hostname -f
> komensky.volny.cz
> ~$


OK, that probably explains things. Exim finds the name "komensky" from
uname(), and then does a DNS lookup to find the fully qualified name.

> And no, I have not set primary_hostname, because this is notebook and it
> is often connected to the Internet with different ISP provider and thus
> it is in different domain.


Running an MTA on a mobile host does have its problems.

> Do I have to set the variable?


It has to get set somehow. Exim calls gethostbyname() when it finds a
single-component name, and then uses the canonical name it is given.

> If the worst
> comes to worst I can do something like
>
>    primary_hostname=${lookup{domain}lsearch{/etc/exim/domainlist}{$value}}


Won't work. primary_hostname is not an expanded string.

> Or is it possible to parse /etc/hosts with exim? I have this as a first
> line of the file, is it possible somehow to parse it?
>
>    127.0.0.1        komensky.volny.cz komensky    localhost


Hmm. That should already work via gethostbyname() if it is configured to
look at /etc/hosts. Does your system have something like
/etc/nsswitch.conf? Does it contain this line?

hosts:      files dns


That says "try /etc/hosts, then try dns".

>    primary_hostname=${sg${lookup{127.0.0.1}lsearch{/etc/hosts}{$value}}\
>    {^(\S+)\s*(\S+)\s*(\S+)\s*\$}{$1}}

>
> (unfortunately, this one doesn't work; why?)


primary_hostname is not expanded.

> It would be nice to maintain only one file. Or if I can get output of
> 'hostname -f' into that variable (but it is not possible to do it in v.
> 3, is it?).


In Exim 4 you could use a .include file in the configuration.

In Exim 3 you would have to write a script that ran 'hostname -f', found
the right value, and concatenated it on the front of the configuration
file. Such a script could run at boot or at MTA start up.

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.
Get the Exim 4 book:    http://www.uit.co.uk/exim-book