[Freeswitch-users] Load balancing solution using pure FreeSWITCH

Tue Mar 16 06:31:13 PDT 2010

Tihomir,
           Could you please add more details to the following?

           "So, i'd suggest to bring up a LAN_HA and have a floating address
between your routing servers.... of course the you should be using ODBC in
the core to have registrations on both servers."

Do you have any links that describe how to implement this kind of fail over?

I thought about configuring 2 DNS servers on 2 Routing servers, so if one
will go down, traffic will be addressed to another, but at the moment I
don't have enough knowledge how to implement this.

Thanks,
vIT

2010/3/16 Vitalii Colosov <vetali100 at gmail.com>

> Basically this solution gives me exactly what I need at the moment.
>
> If there is a still special reason to use OpenSIPS, maybe we should expect
> opinion of some better FS experts then me :-)
>
> vIT
>
> 2010/3/16 Alfredo Quiroga-Villamil <lawwton at gmail.com>
>
> Vit:
>>
>> Nice email, very informative; curious to find out the reasons why you
>> decided to go with FS instead of OpenSip. We soon have to make a
>> similar decision and would like to find out the rationale behind it.
>>
>> Thanks,
>>
>> Alfredo
>>
>> On Tue, Mar 16, 2010 at 8:04 AM, Vitalii Colosov <vetali100 at gmail.com>
>> wrote:
>> > Hi dear FS community,
>> > After a brief analysis of 2 solutions using OpenSIPS
>> > and Kamailio (
>> http://www.opensips.org/html/docs/modules/devel/load_balancer.html#id226109
>> > ) and (http://wiki.freeswitch.org/wiki/SBC_Setup) I decided to
>> implement my
>> > own solution using ONLY FreeSWITCH and ONLY 1 table of any database
>> server
>> > (we use MySQL).
>> > It works on few of our servers right now without any issues.
>> > Feel free to reuse / improve it or provide your comments if you see
>> > something wrong with it.
>> >
>> > We have one routing server (RS) and several Media Servers (MS).
>> > FreeSWITCH is installed on each server in default configuration.
>> > --> MS_1
>> > RS  --> MS_2
>> > --> MS_N
>> >
>> > (Failover can be implemented by adding one more routing server, but this
>> is
>> > out of scope of current description).
>> > Routing server routes calls to media servers based on logic that you can
>> > easily define.
>> > (Generally speaking, Routing server can route part of the calls onto
>> itself,
>> > but to simplify let's say that it will route only to Media Servers).
>> >
>> > Routing server is used to register subscribers (it will have directory
>> files
>> >
>> ./freeswitch/conf/directory/default/10001whatever.xml-99999whatever.xml).
>> > Media servers do NOT contain files with users (security issue? probably
>> > should be managed on dialplan stage of media servers by comparing ip
>> > addresses of requests).
>> >
>> > The whole routing can be presented by the following chain:
>> > Call arrives into Default context-->RS default dialplan-->Lua
>> script-->PHP
>> > script to get destination MEDIA SERVER IP-->back to Lua script-->Bridge
>> > "sofia/external/" to determined MS IP address-->[Bridge to fail over
>> media
>> > server, optionally]-->End
>> > Let's say we need to route all international calls based on less loaded
>> > server (other logic can be easily implemented in PHP script as well).
>> > 1. RS Dialplan: default.xml
>> > <include>
>> >         <extension name="route">
>> >                 <condition field="destination_number"
>> > expression="^(00)(\d+)">
>> >                         <action application="lua" data="route.lua $2"/>
>> >                 </condition>
>> >         </extension>
>> > </include>
>> >
>> > 2. RS Lua script: route.lua
>> > called_number = argv[1]; //without "00"
>> > api = freeswitch.API();
>> > server_ip_address = api:executeString("curl
>> > http://localhost/get_server_ip.php);
>> > forwarding_session_string =
>> > "sofia/external/"..called_number.."@"..server_ip_address;
>> > session:setVariable("bypass_media", "true"); //described below!!!
>> > session:execute("bridge",forwarding_session_string);
>> > 3. PHP script: get_server_ip.php
>> > <<<  ANY PHP CODE THAT WILL QUERY COMMON DATABASE AND WILL DETERMINE
>> LESS
>> > LOADED AT THE MOMENT SERVER>>>
>> > die($less_loaded_server_ip);
>> >
>> > All Media Servers should provide information about their current load
>> into
>> > one common database (dedicated server or routing server can be used for
>> > database).
>> > If you use scripts you can update this table on starting a call and
>> after
>> > call finished.
>> > Or you can create a job that will query FreeSWITCH and will update the
>> > database every, say, 10 seconds.
>> >
>> > Basically that's all (really!)
>> > I beleive it can be used for most general purpose scenarios without need
>> of
>> > third-party tools.
>> > P.S.
>> > The only problem we had from the beginning was that RTP media traffic
>> was
>> > passing thru both servers: RS and Media Server.
>> > But after we added the following command to the routing script, RTP
>> media
>> > traffic started to pass only thru Media server, making RS almost free.
>> > session:setVariable("bypass_media", "true");
>> >
>> >
>> > Best regards,
>> > vIT
>> >
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