[OpenSIPS-Users] Dispatcher state exchange in an anycast clusterer

[Denys Pozniak]

Hello!

I need advice on how best to implement the anycast + clusterer + dispatcher
scheme.
In short, we want to build an additional upper layer in front of our sip
legacy servers, on which traffic balancing will take place.
Most likely it will look like several nodes of the same clusterer with a
single public anycast address, from which traffic will also go to the
public interfaces of the legacy sip servers (via the dispatcher list).
During testing, it turned out that if we include the dispatcher module in
the clusterer, then the inactive nodes of the cluster begin to affect the
general state of the legacy sip servers on active node, since replays to
SIP OPTIONS reach only one active node, though all nodes ping.

Thus, the sip server status is constantly flapping on active node.
Is it possible to somehow make all other nodes believe the active node at a
given time and inherit its dispatcher state?

*node1:*
modparam("clusterer", "sharing_tag", "anycast1/1=active")
modparam("clusterer", "sharing_tag", "anycast2/1=backup")
modparam("clusterer", "sharing_tag", "anycast3/1=backup")
modparam("clusterer", "sharing_tag", "anycast4/1=backup")

modparam("dispatcher", "cluster_sharing_tag", "anycast1")

modparam("dispatcher", "db_url", "text:///etc/opensips/dbtext")
modparam("dispatcher", "attrs_avp", "$avp(dsp_attrs_avp)")
modparam("dispatcher", "script_attrs_avp", "$avp(dsp_script_attrs_avp)")
modparam("dispatcher", "hash_pvar", "$avp(dsp_hash_pvar)")
modparam("dispatcher", "ds_ping_method", "OPTIONS")
modparam("dispatcher", "ds_ping_from", "sip:ping at dispatcher")
modparam("dispatcher", "ds_ping_interval", 10)
modparam("dispatcher", "ds_probing_threshold", 2)
modparam("dispatcher", "ds_probing_mode", 1)
modparam("dispatcher", "options_reply_codes", "501,403,404,400,200")
modparam("dispatcher", "dst_avp", "$avp(dsp_dst_avp)")
modparam("dispatcher", "grp_avp", "$avp(dsp_grp_avp)")
modparam("dispatcher", "cnt_avp", "$avp(dsp_cnt_avp)")
modparam("dispatcher", "persistent_state", 1)
modparam("dispatcher", "cluster_id", 1)
modparam("dispatcher", "cluster_probing_mode", "by-shtag")

*dispatcher:*
id(int,auto) setid(int) destination(string) socket(string,null) state(int)
probe_mode(int) weight(string) priority(int) attrs(string)
description(string)
0:1:sip\:1.1.1.1\:5060;transport=udp::2:1:1:1:'':''
1:1:sip\:2.2.2.2\:5060;transport=udp::2:1:1:1:'':''
2:1:sip\:3.3.3.3\:5060;transport=udp::2:1:1:1:'':''

Sure, it is possible to attach an additional public address to each node
and do not share dispatcher state, but still I would like to somehow find a
solution for the current scheme

--

BR,
Denys Pozniak
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