[SR-Users] problem with dispatcher load balancing

[Daniel-Constantin Mierla]

Hello,

what version of kamailio are you using?

Cheers,
Daniel

On 09/06/15 20:51, Ding Ma wrote:
> I'm trying to set up kamailio dispatcher to distribute calls to 2
> asterisk servers. So far, the failover case seems ok, but I cannot get
> the dispatcher to distribute load. All calls are going to the last
> destination entry in the dispatcher table even if I have set the
> maxload attributes. I'm using algorithm 10 for load distribution. The
> number of calls sent to one asterisk is well above the maxload. Hope
> someone more experienced in dispatcher can review my config and give
> me some recommendations. Thanks in advance.
>
> Here is the content of dispatcher table in postgresql db.
>
> select * from dispatcher;
>  id | setid |    destination     | flags | priority |           attrs
>           | description
> ----+-------+--------------------+-------+----------+---------------------------+-------------
>   1 |     1 | sip:10.0.1.31:5061 <http://10.0.1.31:5061> |     0 |    
>    0 | duid=asterisk1;maxload=25 | Asterisk1
>   2 |     1 | sip:10.0.1.33:5061 <http://10.0.1.33:5061> |     0 |    
>    0 | duid=asterisk2;maxload=25 | Asterisk2
> (2 rows)
>
> Here are the dispatcher sections in kamailio.cfg.
> # ----- dispatcher params -----
> #!ifdef WITH_DISPATCHER
> modparam("dispatcher", "db_url", DBASTURL)
> modparam("dispatcher", "table_name", "dispatcher")
> modparam("dispatcher", "force_dst", 1). 
> # If flag 2 is set, then failover support is enabled.
> modparam("dispatcher", "flags", 3)
> # the last address in destination set is used as a final option to
> send the request to
> modparam("dispatcher", "use_default", 1)
> # load balancing fail over
> modparam("dispatcher", "dst_avp", "$avp(dsdst)")
> modparam("dispatcher", "grp_avp", "$avp(dsgrp)")
> modparam("dispatcher", "cnt_avp", "$avp(dscnt)")
> modparam("dispatcher", "dstid_avp", "$avp(dsdstid)")
> modparam("dispatcher", "attrs_avp", "$avp(dsattrs)")
> # PVs for hashing
> modparam("dispatcher", "hash_pvar", "$fU@$ci")
> # PVs to store results when calling ds_is_from_list
> modparam("dispatcher", "setid_pvname", "$var(setid)")
> modparam("dispatcher", "attrs_pvname", "$var(attrs)")
> # method to probe the gateways
> modparam("dispatcher", "ds_ping_method", "OPTIONS")
> modparam("dispatcher", "ds_ping_from", "sip:dispatcher at localhost")
> modparam("dispatcher", "ds_ping_interval", 30)
> modparam("dispatcher", "ds_probing_threshhold", 10)
> modparam("dispatcher", "ds_ping_reply_codes",
> "class=2;code=403;code=404;code=484;code=488;class=3")
> modparam("dispatcher", "ds_probing_mode", 1)
> # size of hash table storing data for call load dispatching, power of two
> modparam("dispatcher", "ds_hash_size", 10)
> # expiration time in seconds to remove the load on a destination if no
> BYE was received
> modparam("dispatcher", "ds_hash_expire", 3600)
> # expiration time in seconds to remove the load on a destination if no
> 200 OK for INVITE was received
> # and state updated with ds_load_update
> modparam("dispatcher", "ds_hash_initexpire", 60)
> modparam("dispatcher", "ds_hash_check_interval", 30)
> #!endif
>
> route[WITHINDLG] {
> if (has_totag()) {
> # sequential request withing a dialog should
> # take the path determined by record-routing
>
> #!ifdef WITH_DISPATCHER
> if(is_method("BYE|CANCEL") && ds_is_from_list("1", "3"))
> ds_load_update();
> #!endif
> ......
>        }
> }
>
> route[FROMASTERISK] {
> #!ifdef WITH_DISPATCHER
> if(ds_is_from_list("1", "3")) {
> xlog("L_DBG","$rm from $fU@$si:$sp: Call from Asterisk cluster\n");
> return 1;
> }
> return -1;
> #!else
> if ($si==$sel(cfg_get.asterisk.bindip)) {
> return 1;
> }
> return -1;
> #!endif
> }
>
> onreply_route[MANAGE_REPLY] {
> xdbg("incoming reply\n");
> #!ifdef WITH_DISPATCHER
> if(is_method("INVITE") && ds_is_from_list("1", "3")) {
> if(status=~"2[0-9][0-9]") {
> ds_load_update();
> }
> else if(status=~"[3-7][0-9][0-9]") {
> ds_load_unset();
> }
> }
> #!endif
> if(status=~"[12][0-9][0-9]")
> route(NATMANAGE);
> }
>
> #!ifdef WITH_DISPATCHER
> failure_route[RTF_DISPATCH] {
> if (t_is_canceled()) {
> exit;
> }
> # next DST - only for 500 or local timeout
> if (t_check_status("500") or (t_branch_timeout() and
> !t_branch_replied())) {
>                 # mark the destination Inactive and Probing
> ds_mark_dst("IP");
>                 # select the new destination
> if(ds_next_dst()) {
> t_on_failure("RTF_DISPATCH");
> route(RELAY);
> exit;
> }
>                 else {
>                         # last available node failed to reply, no
> other destinations available
>                         send_reply("404", "No destination");
>                         exit;
>                 }
> }
> }
> #!endif
>
> route[TOASTERISK] {
> #!ifdef WITH_DISPATCHER
> # ds_mark_dst("IP");
> # Call load distribution
> if(!ds_select_dst("1", "10")) {
> sl_send_reply("500", "Service Unavailable");
> xlog("L_INFO","$rm from $fU@$si:$sp: No destinations available for
> $rd\n");
>                 exit;
>         }
> xlog("L_DBG", "--- SCRIPT: going to <$ru> via <$du>\n");
> t_on_failure("RTF_DISPATCH");
> #!else
>
>    $du = "sip:" + $sel(cfg_get.asterisk.bindip) + ":"
> + $sel(cfg_get.asterisk.bindport);
> #!endif
> route(RELAY);
> exit;
> }
>
>
> # Dispatcher detects a destination goes down
> event_route[dispatcher:dst-down] {
>     xlog("L_ERR", "Destination down: $rm $ru ($du)\n");
> }
>
> # Dispatcher detects a destination comes up 
> event_route[dispatcher:dst-up] {
>     xlog("L_ERR", "Destination up: $rm $ru\n");
> }
>
>
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-- 
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Book: SIP Routing With Kamailio - http://www.asipto.com

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