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Old 22nd November 2008
satimis satimis is offline
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Default Virtual domains on multiple mail servers running Exim4 as MTA

Hi folks,


Exim as MTA


What I'm exploring is as follow;

- building multiple mail servers on guests of a Xen box running Debian Etch (I can make it without problem)

- all mail servers running Exim4 as MTA. Each guest being a mail server has its own servername and local IP.

- the most important goal is how to run multiple domains on one external IP. Each incoming mail can be delivered to its own mail server. It is similar to virtual domain. I made it on one mail server before without problem running other MTA. But I have no idea how to build virtual domain on multiple mail servers.


Could you please shed me some light? Pointer would be appreciated.


Regarding DNS server, bind9, do I need building it on each mail server? Can I build only DNS on one mail server to be shared by others?


TIA


B.R.
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Old 23rd November 2008
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It's difficult to understand what are you trying to achieve or how is your system currently configured.

One thing is sure though - you don't need DNS server on each mail servers.
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Old 24th November 2008
satimis satimis is offline
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Quote:
Originally Posted by deemon View Post
It's difficult to understand what are you trying to achieve or how is your system currently configured.
Hi deemon,


Xen - virtualization package
host - Debian Etch, basic workstation
guest - Debian Etch
MTA - Postfix virtual
Database - MySQL


I just finished setting up a mail server on the guest of a Xen box running Postfix virtual. The said server serves multiple domains but connected to ONE external IP. On each domain there are multiple users. The mail server is now working. Incoming mails are routed to respective domain directory by MySQL. Users can login the server with their own login and password to send/receive mails on their mail client, Evolution. Or they can send/read mails direct on Webmail, SquirrelMail.


Now my further exploration is instead of making MySQL route all incoming mails to respective domain directories created for this purpose can MySQL route the mails to other mail servers also running as guest on the same Xen box? Each mail server has its own hostname (the domain) and local IP. The working mail server together with MySQL do the routing.


Quote:
One thing is sure though - you don't need DNS server on each mail servers.
/etc/resolv.conf can do the job. But my exploration is to build my own DNS server on a guest of Xen and a slave on another guest. I have no problem setting up BIND9 on mail server and disabling /etc/resolv.conf afterwards when the former is in operation. But I have no idea what port is needed by BIND9? If the same port is also needed by the mail servers on other guests is there a glue to sort out this problem?


Thanks


B.R.
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Old 24th November 2008
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bind9 is in FreeBSD base system, you don't need to install anything from ports to set it up.

So basically you have one mail gateway that has to route mail for different domains to different guest systems with IP addresses from private address space.
For that you have to set up virtual transports on the gateway. Check out transport_maps and relay_domains tables.
You'll just need to add smtp:YOURGUESTIP (or YOURGUESTHOSTNAME) as transports for your domains and mail will be routed to that IP/HOSTNAME.
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Old 24th November 2008
satimis satimis is offline
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Quote:
Originally Posted by deemon View Post
bind9 is in FreeBSD base system, you don't need to install anything from ports to set it up.
Hi deemon,


Thanks for your advice.


Still I can't resolve if I install BIND9 on a guest of Xen box, only a base OS, BIND9 and some other required packages. Do I need to forward any port to it?


If the local IP of this guest is 192.168.0.201 then on other guests (mail server) I'll edit /etc/resolv.conf
Code:
nameserver   192.168.0.201
Nothing else. Can it work?


Quote:
So basically you have one mail gateway that has to route mail for different domains to different guest systems with IP addresses from private address space.
For that you have to set up virtual transports on the gateway. Check out transport_maps and relay_domains tables.
You'll just need to add smtp:YOURGUESTIP (or YOURGUESTHOSTNAME) as transports for your domains and mail will be routed to that IP/HOSTNAME.
On the same mail server I don't have any problem.

/etc/postfix/mysql_transport.cf
Code:
user=mail 
password=apassword 
dbname=maildb 
table=backups 
select_field=transport 
where_field=domain 
hosts=127.0.0.1 
additional_conditions = and enabled = 1

mysql> SHOW tables;
Code:
+------------------+
| Tables_in_maildb |
+------------------+
| aliases          |
| domains          |
| users            |
...
...

mysql> SELECT * from domains;
Code:
+------+-----------------------+-----------+---------+
| pkid | domain                | transport | enabled |
+------+-----------------------+-----------+---------+
|    1 | localhost             | virtual:  |       1 |
|    2 | localhost.localdomain | virtual:  |       1 |
|    3 | satimis.com           | virtual:  |       1 |
|    4 | satimis.dnsalias.com  | virtual:  |       1 |
|    5 | satimis.changeip.net  | virtual:  |       1 |
.....
....

mysql> SELECT * from users;
Code:
+------------------------------+---------------+------+------+-------------------------+-------------------+---------+-----------------+----------------+---------------+-------+------------+----------------+
| id                           | name          | uid  | gid  | home                    | maildir           | enabled | change_password | clear          | crypt         | quota | procmailrc | spamassassinrc |
+------------------------------+---------------+------+------+-------------------------+-------------------+---------+-----------------+----------------+---------------+-------+------------+----------------+
| root@localhost               | root          | 5000 | 5000 | /var/spool/mail/virtual | root/             |       1 |               1 | passwd1        | sdtrusfX0Jj66 |       |            |                |
| satimis@satimis.com          | Satimis       | 5000 | 5000 | /var/spool/mail/virtual | Satimis/          |       1 |               1 | passwd2    | sdtrusfX0Jj66 |       |            |                |
| lms@satimis.com              | lmsoomn       | 5000 | 5000 | /var/spool/mail/virtual | LMS/              |       1 |               1 |passwd3         | sdtrusfX0Jj66 |       |            |                |
| albert@satimis.com           | Albert Conong | 5000 | 5000 | /var/spool/mail/virtual | Albert/           |       1 |               1 | passwd4      | sdtrusfX0Jj66 |       |            |                |
| lms@satimis.dnsalias.com     | lmsoomn       | 5000 | 5000 | /var/spool/mail/virtual | dnsalias/LMS/     |       1 |               1 | passwd5 | sdtrusfX0Jj66 |       |            |                |
| satimis@satimis.dnsalias.com | Satimis       | 5000 | 5000 | /var/spool/mail/virtual | dnsalias/Satimis/ |       1 |               1 | passwd6 | sdtrusfX0Jj66 |       |            |                |
| satimis@satimis.changeip.net | Satimis       | 5000 | 5000 | /var/spool/mail/virtual | changeip/Satimis/ |       1 |               1 | passwd7 | sdtrusfX0Jj66 |       |            |                |
| lms@satimis.changeip.net     | lmsoomn       | 5000 | 5000 | /var/spool/mail/virtual | changeip/LMS/     |       1 |               1 | passwd8 | sdtrusfX0Jj66 |       |            |                |
.......

IF;

1)
domain "satimis.dnsalias.com" is on MailServerB
local IP=192.168.111.301
directory of user "satimis@satimis.dnsalias.com" = /home/Satimis
directory fo user "lms@satimis.dnsalias.com" = /home/LMS
etc.


2)
domain "satimis.changeip.net" is on MailServerC
local IP=192,168.111.302
directory of user "satimis@satimis.changeip.net" = /home/Satimis
directory of user "lms@satimis.changeip.net" = /home LMS
etc.

3)
etc.


Then how to edit those 2 MySQL files? Any further file needs to create? TIA


I think I'll make MailServerA, the current running mail server, for routing ONLY.


B.R.
satimis
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Old 24th November 2008
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Quote:
Originally Posted by satimis View Post
Still I can't resolve if I install BIND9 on a guest of Xen box, only a base OS, BIND9 and some other required packages. Do I need to forward any port to it?
If you installed FreeBSD with Standard installation procedure then everything required to run nameserver is already in system. No additional software needed.
If you only use it only locally* then I don't think any port forwarding is necessary.
* locally - in host system or in any of the guest systems.

Quote:
If the local IP of this guest is 192.168.0.201 then on other guests (mail server) I'll edit /etc/resolv.conf
Code:
nameserver   192.168.0.201
Nothing else. Can it work?
That should work.


Quote:
On the same mail server I don't have any problem.

/etc/postfix/mysql_transport.cf
Code:
user=mail 
password=apassword 
dbname=maildb 
table=backups 
select_field=transport 
where_field=domain 
hosts=127.0.0.1 
additional_conditions = and enabled = 1
It seems you use old postfix mysql interface. Not that it's wrong or anything but I find the new interface (since postfix 2.2) for mysql is better (clearer & more flexible, can use joins etc..)
Check mysql_table man page.
New interface would be with the example above like this:
Code:
hosts = 127.0.0.1
user = mail
password = apassword
dbname = maildb 

query = SELECT transport FROM backups WHERE domain='%s' AND enabled=1
Quote:
I think I'll make MailServerA, the current running mail server, for routing ONLY.
Yes - that's exacly what you should do and that's what I had in mind when I was talking about mail gateway.
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Last edited by deemon; 24th November 2008 at 04:29 PM.
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Old 24th November 2008
satimis satimis is offline
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Quote:
Originally Posted by deemon View Post
If you installed FreeBSD with Standard installation procedure then everything required to run nameserver is already in system. No additional software needed.
If you only use it only locally* then I don't think any port forwarding is necessary.
* locally - in host system or in any of the guest systems.
Unfortunately I can't install FreeBSD on the guest of the Xen box. I'll install Debian Etch as OS. Besides I'll remove /etc/resolv.conf. Can BIND9 do the job replacing resolv.conf ?


Quote:
It seems you use old postfix mysql interface. Not that it's wrong or anything but I find the new interface (since postfix 2.2) for mysql is better (clearer & more flexible, can use joins etc..)
Check mysql_table man page.
New interface would be with the example above like this:
Code:
hosts = 127.0.0.1
user = mail
password = apassword
dbname = maildb 

query = SELECT transport FROM backups WHERE domain='%s' AND enabled=1
Noted with thanks.


Quote:
Yes - that's exacly what you should do and that's what I had in mind when I was talking about mail gateway.
Still I haven't got a clear picture on the settings of MySQL users table to make the incoming mails to be routed to their mail servers according to domain. Example would be appreciated. TIA


B.R.
satimis
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Old 24th November 2008
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Quote:
Originally Posted by satimis View Post
Unfortunately I can't install FreeBSD on the guest of the Xen box. I'll install Debian Etch as OS.
Heh - sorry, I didn't pay attention - I assumed you had FreeBSD installed.
I can't help you with linux packages though, I don't have much experience on that field.

Quote:
Besides I'll remove /etc/resolv.conf. Can BIND9 do the job replacing resolv.conf ?
resolv.conf is still required - that's how you show your system which nameservers to use. Just having having bind installed and configured is not enought.

Quote:
Still I haven't got a clear picture on the settings of MySQL users table to make the incoming mails to be routed to their mail servers according to domain. Example would be appreciated. TIA
I guess think you need only one table:
Code:
CREATE TABLE domains (
    domain VARCHAR(255) NOT NULL AUTO_INCREMENT,
    transport VARCHAR(255) NOT NULL,
    PRIMARY KEY (domain)
);
Then you'll add mysql maps to relay_domains and transport_maps.

query for relay_domains map would be: SELECT 't' FROM domains WHERE domain='%s';
and for transport_maps: SELECT transport FROM domains WHERE domain='%s';
.. where transport is smtp:HOSTNAME.

For example:
domain: satimis.dnsalias.com, transport: smtp:MailServerB
domain: satimis.changeip.net, transport: smtp:MailServerC
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Old 25th November 2008
satimis satimis is offline
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Quote:
Originally Posted by deemon View Post
Heh - sorry, I didn't pay attention - I assumed you had FreeBSD installed.
I can't help you with linux packages though, I don't have much experience on that field.
Hi deemon,


Linux is the same not necessary installing BIND9. /etc/resolv.conf
Code:
nameservers   ISP dns1
nameservers  ISP dns2
will do the job.


What I'm trying to do installing BIND9 is ONLY for learning building my own DNS server.


Quote:
Code:
resolv.conf is still required - that's how you show your system which nameservers to use. Just having having bind installed and configured is not enought.
Noted with thanks


Quote:
I guess think you need only one table:
Code:
CREATE TABLE domains (
    domain VARCHAR(255) NOT NULL AUTO_INCREMENT,
    transport VARCHAR(255) NOT NULL,
    PRIMARY KEY (domain)
);
Then you'll add mysql maps to relay_domains and transport_maps.

query for relay_domains map would be: SELECT 't' FROM domains WHERE domain='%s';
and for transport_maps: SELECT transport FROM domains WHERE domain='%s';
.. where transport is smtp:HOSTNAME.

For example:
domain: satimis.dnsalias.com, transport: smtp:MailServerB
domain: satimis.changeip.net, transport: smtp:MailServerC

On the running mail server /etc/postfix/main.cf the entries re virtual domains are as follows;
Code:
alias_maps = hash:/etc/postfix/aliases 
alias_database = hash:/etc/postfix/aliases

virtual_alias_maps = mysql:/etc/postfix/mysql_alias.cf
virtual_gid_maps = mysql:/etc/postfix/mysql_gid.cf
virtual_mailbox_base = /var/spool/mail/virtual
virtual_mailbox_domains = mysql:/etc/postfix/mysql_domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_mailbox.cf
virtual_uid_maps = mysql:/etc/postfix/mysql_uid.cf

then I have to add another line
Code:
transport_maps=mysql:/etc/postfix/mysql_transport_maps.cf

I have 3 tables on maildb, the database

mysql> show tables;
Code:
+------------------+
| Tables_in_maildb |
+------------------+
| aliases          |
| domains          |
| users            |
+------------------+

I ran following commands creating domains;
Code:
mysql> CREATE TABLE `domains` (
    -> `pkid` smallint(6) NOT NULL auto_increment,
    -> `domain` varchar(120) NOT NULL default '',
    -> `transport` varchar(120) NOT NULL default 'virtual:',
    -> `enabled` tinyint(1) NOT NULL default '1',
    -> PRIMARY KEY (`pkid`)
    -> ) ;



mysql> SELECT * from domains;
Code:
+------+-----------------------+-----------+---------+
| pkid | domain                | transport | enabled |
+------+-----------------------+-----------+---------+
|    1 | localhost             | virtual:  |       1 |
|    2 | localhost.localdomain | virtual:  |       1 |
|    3 | satimis.com           | virtual:  |       1 |
|    4 | satimis.dnsalias.com  | virtual:  |       1 |
|    5 | satimis.changeip.net  | virtual:  |       1 |
+------+-----------------------+-----------+---------+

Do I need to make any change here?


According to your advice I'll add another table "transport"

I'll run following command to create it;
Code:
CREATE TABLE `transport` (
 	`pkid` smallint(6) NOT NULL auto_increment, 
	`domain` varchar(128) NOT NULL default '', 
	`hostname` varchar(128) NOT NULL default '', 
	`transport` varchar(128) NOT NULL default ':[]', 
	`enabled` smallint(6) NOT NULL default '1', 
	PRIMARY KEY (`pkid`), 
	UNIQUE KEY `domain` (`domain`) 
);
Then run;
Code:
INSERT INTO transport (domain,hostname) VALUES 
('satimis.dnsalias.com','MailServerB');
INSERT INTO transport (domain,hostname) VALUES 
('satimis.changeip.net','MailServerC');
etc.

If I'm wrong please correct me. Thanks


Can I replay the hostname "MailServerB" with its local IP?


Create this file /etc/postfix/mysql_relay_domains
Code:
user=mail 
password=apassword 
dbname=maildb 
table='t'
select_field=domains
where_field=domains
hosts=127.0.0.1 
additional_conditions = and enabled = 1

and then create this file /etc/postfix/mysql_transport_maps.cf
Code:
user=mail 
password=apassword 
dbname=maildb 
table=transport
select_field=hostname 
where_field=domain
hosts=127.0.0.1 
additional_conditions = and enabled = 1

Remark:
I have following 5 files created already. Do I need to make any change on them?


/etc/postfix/mysql_mailbox.cf
Code:
user=mail
password=apassword
dbname=maildb
table=users
select_field=maildir
where_field=id hosts=127.0.0.1
additional_conditions = and enabled = 1

/etc/postfix/mysql_uid.cf
Code:
user=mail
password=apassword
dbname=maildb
table=users
select_field=uid
where_field=id
hosts=127.0.0.1

/etc/postfix/mysql_gid.cf
Code:
user=mail
password=apassword
dbname=maildb
table=users
select_field=gid
where_field=id
hosts=127.0.0.1

/etc/postfix/mysql_alias.cf
Code:
user=mail
password=apassword
dbname=maildb
table=aliases
select_field=destination
where_field=mail
hosts=127.0.0.1
additional_conditions = and enabled = 1

/etc/postfix/mysql_domains.cf
Code:
user=mail
password=apassword
dbname=maildb
table=domains
select_field=domain
where_field=domain
hosts=127.0.0.1
additional_conditions = and enabled = 1

B.R.
satimis

Last edited by satimis; 25th November 2008 at 07:31 AM. Reason: correction
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Old 26th November 2008
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deemon deemon is offline
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Quote:
Originally Posted by satimis View Post
Then run;
Code:
INSERT INTO transport (domain,hostname) VALUES 
('satimis.dnsalias.com','MailServerB');
INSERT INTO transport (domain,hostname) VALUES 
('satimis.changeip.net','MailServerC');
etc.

If I'm wrong please correct me. Thanks
The transport must have smtp: prefix if you wanto to forward the email to another smtp server. Check my example in previous post.


Quote:
Can I replay the hostname "MailServerB" with its local IP?
Yes
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Old 27th November 2008
satimis satimis is offline
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Quote:
Originally Posted by deemon View Post
The transport must have smtp: prefix if you wanto to forward the email to another smtp server. Check my example in previous post.


Yes
Hi deemon,


Your advice works here. Steps performed as follows;

All 3 mail servers are running on the same Xen box as guests.


One external IP with all ports forwarded to 192.168.0.207


Server-1
Local IP - 192.168.0.207
for routing

Server-2
Local IP - 192.168.0.208
domain - satimis.changip.net

Server-3
Local IP -192.168.0.209
domain - satimis.dnsalias.com


On Server-1


# grep transport_maps /etc/postfix/main.cf
Code:
# transport_maps = mysql:/etc/postfix/mysql_transport.cf
# nano /etc/postfix/main.cf
uncomment above line and change it as;
Code:
transport_maps = mysql:/etc/postfix/mysql_transport_maps.cf

# mysql -p maildb

mysql> SHOW tables;
Code:
+------------------+
| Tables_in_maildb |
+------------------+
| aliases          |
| domains          |
| users            |
+------------------+
3 rows in set (0.00 sec)

Code:
mysql> CREATE TABLE `transport`
    -> `pkid` smallint(6) NOT NULL auto_increment,
    -> `domain` varchar(128) NOT NULL default '',
    -> `hostname` varchar(128) NOT NULL default '',
    -> `transport` varchar(128) NOT NULL default ':[]',
    -> `enabled` smallint(6) NOT NULL default '1',
    -> PRIMARY KEY (`pkid`),
    -> UNIQUE KEY `domain` (`domain`)
    -> );
Query OK, 0 rows affected (0.01 sec)

mysql> SHOW tables;
Code:
+------------------+
| Tables_in_maildb |
+------------------+
| aliases          |
| domains          |
| transport        |
| users            |
+------------------+
4 rows in set (0.00 sec)

mysql> DESCRIBE transport;
Code:
+-----------+--------------+------+-----+---------+----------------+
| Field     | Type         | Null | Key | Default | Extra          |
+-----------+--------------+------+-----+---------+----------------+
| pkid      | smallint(6)  | NO   | PRI | NULL    | auto_increment |
| domain    | varchar(128) | NO   | UNI |         |                |
| hostname  | varchar(128) | NO   |     |         |                |
| transport | varchar(128) | NO   |     | :[]     |                |
| enabled   | smallint(6)  | NO   |     | 1       |                |
+-----------+--------------+------+-----+---------+----------------+
5 rows in set (0.01 sec)

Code:
mysql> INSERT INTO transport (domain,hostname) VALUES
    -> ('satimis.dnsalias.com','smtp:192.168.0.209');
Query OK, 1 row affected (0.00 sec)

Code:
mysql> INSERT INTO transport (domain,hostname) VALUES
     -> ('satimis.changeip.net','smtp:192.168.0.208'); 
Query OK, 1 row affected (0.00 sec)

mysql> SELECT * from transport;
Code:
+------+----------------------+--------------------+-----------+---------+
| pkid | domain               | hostname           | transport | enabled |
+------+----------------------+--------------------+-----------+---------+
|    1 | satimis.dnsalias.com | smtp:192.168.0.209 | :[]       |       1 |
|    2 | satimis.changeip.net | smtp:192.168.0.208 | :[]       |       1 |
+------+----------------------+--------------------+-----------+---------+
2 rows in set (0.00 sec)
mysql> exit
Bye


# nano /etc/postfix/mysql_relay_domains.cf
Code:
user=mail
password=apassword
dbname=maildb
table='t'
select_field=domains
where_field=domains
hosts=127.0.0.1
additional_conditions = and enabled = 1

Remark: What is 't' here for ?


# /etc/init.d/mysql reload
Code:
Reloading MySQL database server: mysqld.
# tail /var/log/mysql.log
# tail /var/log/mysql.err
both without complaint


# postfix reload
Code:
postfix/postfix-script: refreshing the Postfix mail system
# postfix check
No complaint

# tail /var/log/mail.log
Code:
Nov 27 13:09:36 xen07 spamd[2704]: spamd: server successfully spawned child process, pid 2735
Nov 27 13:09:36 xen07 spamd[2704]: spamd: server successfully spawned child process, pid 2736
Nov 27 13:09:36 xen07 spamd[2704]: prefork: child states: IS
Nov 27 13:09:36 xen07 spamd[2704]: prefork: child states: II
Nov 27 13:09:37 xen07 authdaemond: modules="authmysql", daemons=5
Nov 27 13:09:37 xen07 authdaemond: Installing libauthmysql
Nov 27 13:09:37 xen07 authdaemond: Installation complete: authmysql
Nov 27 13:09:38 xen07 postfix/master[2923]: daemon started -- version 2.3.8, configuration /etc/postfix
Nov 27 13:39:48 xen07 postfix/postfix-script: refreshing the Postfix mail system
Nov 27 13:39:48 xen07 postfix/master[2923]: reload configuration /etc/postfix
No complaint/error


Mails sent to satimis@satimis.changeip.net were delivered to Server-2. Mails sent to satimis@satimis.dnsalias.net were deliverd to Server-3


Lot of thanks for your advice.


There is one drawback here. First I started Server-1 followed by Server-2 and finally Server-3. Keystokes on Server-3 were slow to response. I have to sit back and wait for keystroke to respond. If only running either Server-2 or Server-3 there was no such problem. I have 4G RAM on board. Have you had any idea where to check the cause? TIA


B.R.
satimis

Last edited by satimis; 27th November 2008 at 02:44 PM.
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