A backup/fallback mailhost can be configured on a second host by
modifying the MX records of the DNS database. Another MX record with a
lower priority pointing to the fallback mail server did the trick.
Thanks for all the timely responses. I am attaching some responses which
really got me going.
-Zac
Thanks for the response:
Marco Greene
Craig Russell
Palmieri, Matt
Thomal Lewis
Paut.Teasdel
Chris Carifle
Kevin Sheehan
Jon E. Kupm
Mihalis Tsoukalos
Michael Hocke
> -----Original Message-----
> Dear Sun-Managers,
> We have a mailhost in our domain which serves to send/receive mails
> within and outside our domain. Is it possible to configure a second mail
> host in the same domain which will act as a backup mailhost. That is,
> when the main mailhost goes down for an extended period the backup
> mailhost takes over. If so what are the configuaration changes I have to
> make. We run NIS and DNS service on an ethernet. I tried the summaries
> archive and could not find a similar qery. Thanks in advance for all
> help/pointers. Will summarize
>
> -Zac
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From: "Marco Greene" <mgreene@sympatico.ca>
To: "Z.K. Zachariah" <zac@agorics.com>
Subject: RE: A Backup Mailhost
Date: Thu, 2 Dec 1999 14:21:10 -0500
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The first step is to add a second MX entry for your new mailserver....give
it a lower priority so that the main one will always be referenced first.
Then you want to configure the secondary mailhost to forward the mail the
the main mailhost. This way it avoids the problem of users having to go to
two mailboxes to get their mail.
An alternative to this is to use an NFS server and have both the secondary
and primary mailhosts mount the /var/mail directory. Then run your pop3 or
imap4 daemon on that particular host. For even more redundancy I would
configure this NFS server to work in an HA environment. I haven't actually
tried this myself but in theory it should work.
-----Original Message-----
From: owner-sun-managers@sunmanagers.ececs.uc.edu
[mailto:owner-sun-managers@sunmanagers.ececs.uc.edu]On Behalf Of Z.K.
Zachariah
Sent: Thursday, December 02, 1999 1:46 PM
To: sun-managers@sunmanagers.ececs.uc.edu
Subject: A Backup Mailhost
Dear Sun-Managers,
We have a mailhost in our domain which serves to send/receive mails
within and outside our domain. Is it possible to configure a second mail
host in the same domain which will act as a backup mailhost. That is,
when the main mailhost goes down for an extended period the backup
mailhost takes over. If so what are the configuaration changes I have to
make. We run NIS and DNS service on an ethernet. I tried the summaries
archive and could not find a similar qery. Thanks in advance for all
help/pointers. Will summarize
-Zac
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for <zac@agorics.com>; Thu, 2 Dec 1999 16:18:45 -0500 (EST)
Date: Thu, 2 Dec 1999 16:18:44 -0500 (EST)
From: Thomas Lewis <tlewis@geo.hunter.cuny.edu>
To: "Z.K. Zachariah" <zac@agorics.com>
Subject: Re: A Backup Mailhost
In-Reply-To: <3846BE50.DD401954@agorics.com>
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---559023410-1804928587-944169524=:26780
Content-Type: TEXT/PLAIN; charset=US-ASCII
I subscribe to a magazine called the Linux Journal. In their archives
they discussed setting up Linux as a back up email server. You can use
the same techniques to set it up on a Solaris server. I have copied their
article from their web site and attached it for you to read (it is without
the graphics). Also the 3rd edition of DNS and BIND from O'Reilly
discusses how to set up a back up mail server.
I hope this helps you some.
==================================================
Thomas Lewis
UNIX & NT Systems Administrator
Geography Department & Computer Science Department
Hunter College of the City University of New York
695 Park Avenue
New York, NY 10021
(212)772-4535 Office
(212)772-5268 Fax
tlewis@geo.hunter.cuny.edu
On Thu, 2 Dec 1999, Z.K. Zachariah wrote:
> Dear Sun-Managers,
> We have a mailhost in our domain which serves to send/receive mails
> within and outside our domain. Is it possible to configure a second mail
> host in the same domain which will act as a backup mailhost. That is,
> when the main mailhost goes down for an extended period the backup
> mailhost takes over. If so what are the configuaration changes I have to
> make. We run NIS and DNS service on an ethernet. I tried the summaries
> archive and could not find a similar qery. Thanks in advance for all
> help/pointers. Will summarize
>
>
> -Zac
>
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Date: Thu, 02 Dec 1999 18:04:01 -0600 (CST)
Organization: Pulitzer Technologies Inc.
From: "Jon E. Kump" <xavier@postnet.com>
To: "Z.K. Zachariah" <zac@agorics.com>
Subject: RE: A Backup Mailhost
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You could set up two mail servers and change the wait of the second one to be hi
gher than the first. That way if the first one goes down then sendmail will kee
p trying all MX records it finds until it finds ont that works.
This is all done inside of DNS.
A snippet from our DNS records follows
; MX only records
;
IN MX 0 mail.postnet.com.
IN MX 150 cvspost.postnet.com.
mail.postnet.com for us is actual 3 different servers.
-> nslookup
Default Server: localhost
Address: 127.0.0.1
> set q=mx
> postnet.com
Server: localhost
Address: 127.0.0.1
postnet.com preference = 150, mail exchanger = cvspost.postnet.com
postnet.com preference = 0, mail exchanger = mail.postnet.com
postnet.com nameserver = ns1.900walnut.net
postnet.com nameserver = ns1.stlnet.com
cvspost.postnet.com internet address = 209.96.6.21
mail.postnet.com internet address = 209.96.6.17
mail.postnet.com internet address = 209.96.6.26
mail.postnet.com internet address = 209.96.6.27
ns1.900walnut.net internet address = 209.96.0.5
ns1.stlnet.com internet address = 209.96.6.5
Nothing has to be done in the sendmail.cf file.
Hope this helps
- Jon
On 02-Dec-99 Z.K. Zachariah wrote:
> Dear Sun-Managers,
> We have a mailhost in our domain which serves to send/receive mails
> within and outside our domain. Is it possible to configure a second mail
> host in the same domain which will act as a backup mailhost. That is,
> when the main mailhost goes down for an extended period the backup
> mailhost takes over. If so what are the configuaration changes I have to
> make. We run NIS and DNS service on an ethernet. I tried the summaries
> archive and could not find a similar qery. Thanks in advance for all
> help/pointers. Will summarize
>
>
> -Zac
>
-------------------------------------------------------------------------
|Jon E. Kump Sr. Unix Systems Administrator, Web Programmer,|
|jkump@postnet.com Systems Programmer, Postmaster |
|xavier@postnet.com Pulitzer Technologies, Inc. |
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Date: Fri, 3 Dec 1999 13:01:29 -0500 (EST)
From: Michael Hocke <mhocke@globix.net>
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To: "Z.K. Zachariah" <zac@agorics.com>
Subject: Re: A Backup Mailhost
In-Reply-To: <3846BE50.DD401954@agorics.com>
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On Thu, 2 Dec 1999, Z.K. Zachariah wrote:
> We have a mailhost in our domain which serves to send/receive mails
> within and outside our domain. Is it possible to configure a second mail
> host in the same domain which will act as a backup mailhost.
Add a second MX record with lower priority to your zone which points to
your backup mail host. I assume, you are running sendmail. Only the
primary mail server should have an entry in the cw class for your domain.
The backup server will forward all incoming mail for your domain to the
primary mail server if it is accepting mail. If not, the mail will stay
for the time being on the backup server.
There are two excellent books out there which cover this and many more
issues: 'sendmail' and 'SND and BIND' from O'Reilly.
- Michael
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:13:34 CDT