[lvs-users] Load Balancing SMTP with direct routing

Alex Attarian u2sashko at gmail.com
Thu Oct 16 16:07:22 BST 2014





> 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  ?

> 
> - 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.
> 
> 
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