[lvs-users] Load Balancing SMTP with direct routing

Alexandre infos at opendoc.net
Thu Oct 16 17:51:49 BST 2014


Sorry, I am stupid, i do not modifify exim4 configuration for listen on 
loopback. In /etc/exim4/update-exim4.conf.conf

---
dc_local_interfaces='127.0.0.1; 10.0.0.96; 10.0.0.102'
---

Now
---
telnet 10.0.0.102 25
Trying 10.0.0.102...
Connected to 10.0.0.102.
Escape character is '^]'.
220 XXXXXXXXXX ESMTP Exim 4.80 Thu, 16 Oct 2014 18:49:14 +0200
---

Thank you to all.

Alex.

On 10/16/14 17:32, Alexandre wrote:
>
>
> On 10/16/14 17:07, Alex Attarian wrote:
>>
>>
>>
>>
>>> On Oct 16, 2014, at 5:02 AM, Alexandre <infos at opendoc.net> wrote:
>>>
>>> Hello list, I will wish to implement an architecture of outgoing mail
>>> servers. We already have a SQL load balancer. Here is my plan. All ports
>>> are standard and LVS is configured with direct routing
>>>
>>> 1. Web server response directly to a client
>>> 2. Mysql server repose directly to a web server
>>> 3. Servers generate emails and push email to a load balancer on port 25
>>> 4. Mail servers send mails to different recipients.
>>>
>>>                                INTERNET
>>>                                   |
>>>                               +------+
>>>                               |ROUTER|
>>>                               +------+
>>>                                   |
>>>                                   |
>>>                                   |
>>>                                   |
>>>                                   |
>>>                               +---+----+
>>> Outbound mail server<-------|  LVS   |-----------> Web server
>>>                               +---+----+
>>>                                   |
>>>                                   |
>>>                                   |
>>>                                   |
>>>                                   |
>>>                                   |
>>>           +-----------------------+----------------------------------+
>>>           |                                                          |
>>>           |                                                          |
>>> Servers that generate emails.                              Mysql Server
>>>
>>>
>>>
>>> Here is my set :
>>> --------------------------------------------------------------------------------
>>> # ====================
>>> # OUTBOUND MAIL SERVER
>>> # ====================
>>> virtual=10.0.0.102:25
>>>           emailalert="admin at meteoconsult.fr"
>>>           real=10.0.0.96:25 gate
>>>           real=10.0.0.97:25 gate
>>>           real=10.0.0.98:25 gate
>>>           real=10.0.0.97:25 gate
>>>           service=smtp
>>>           scheduler=rr
>>>           fallback=127.0.0.1:25 gate
>>>           protocol=tcp
>>>           checktype=negotiate
>>> --------------------------------------------------------------------------------
>>>
>>>
>>> On outbound mail server, I add in a rc.local :
>>> --------------------------------------------------------------------------------
>>> /bin/echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
>>> /bin/echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_announce
>>> /sbin/ifconfig lo:0 10.0.0.102 netmask 255.255.255.255 up
>>> --------------------------------------------------------------------------------
>>>
>>> However nothing works. When I make a test with telnet :
>>> - through the load balancer:
>>> ---
>>> telnet 10.0.0.102 25
>>> Trying 10.0.0.102...
>>> telnet: Unable to connect to remote host: Connection refused
>>> ---
>>
>> Do you have port 25 blocked on the loadbalancer? Check your firewall on the loadbalancer. Also can you paste the output of ipvsadm -L -n  ?
>
> Hi, I think the firewall is not enable :
> ---
> iptables -L
> Chain INPUT (policy ACCEPT)
> target     prot opt source               destination
>
> Chain FORWARD (policy ACCEPT)
> target     prot opt source               destination
>
> Chain OUTPUT (policy ACCEPT)
> target     prot opt source               destination
> ---
>
> This is the output :
> ---
> ipvsadm -L -n
> IP Virtual Server version 1.2.1 (size=4096)
> Prot LocalAddress:Port Scheduler Flags
>     -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
> TCP  10.0.0.102:25 rr
>     -> 10.0.0.96:25                 Route   1      0          0
>     -> 10.0.0.97:25                 Route   0      0          0
>     -> 10.0.0.98:25                 Route   0      0          0
> ---
> Just 10.0.0.96 is active.
>
> Thx
>
> Alex.
>>
>>>
>>> - directly to the mail server :
>>> ---
>>> telnet 10.0.0.96 25
>>> Trying 10.0.0.96...
>>> Connected to 10.0.0.96.
>>> Escape character is '^]'.
>>> 220 XXXXXXXXXXXXXXXXXXXX ESMTP Exim 4.80 Thu, 16 Oct 2014 13:58:49 +0200
>>> ---
>>>
>>> Do you have any idea? I'm a bit stuck.
>>>
>>> Thank you to all.
>>>
>>>
>>> _______________________________________________
>>> Please read the documentation before posting - it's available at:
>>> http://www.linuxvirtualserver.org/
>>>
>>> LinuxVirtualServer.org mailing list - lvs-users at LinuxVirtualServer.org
>>> Send requests to lvs-users-request at LinuxVirtualServer.org
>>> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>>
>> _______________________________________________
>> Please read the documentation before posting - it's available at:
>> http://www.linuxvirtualserver.org/
>>
>> LinuxVirtualServer.org mailing list - lvs-users at LinuxVirtualServer.org
>> Send requests to lvs-users-request at LinuxVirtualServer.org
>> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>>
>
> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
> LinuxVirtualServer.org mailing list - lvs-users at LinuxVirtualServer.org
> Send requests to lvs-users-request at LinuxVirtualServer.org
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>



More information about the lvs-users mailing list