Hi,
Maybe it would be easier to explain my expectations on how it's supposed to work, and then you can tell me where I'm making a wrong assumption __
So, load balancers like haproxy etc perform "health checks" on the service being balanced. In this case, I have it setup for Kamailio to send OPTIONS and I do in fact see those packets and 200 OK responses. And if haproxy sees a host is down, it immediately stops trying to send client requests to that host.
In this case, after 10 successful OPTIONS pings, Kamailio marks the destination as AP and everything is fine, Kamailio correctly returns the destination in ds_select_dst.
I have the settings below, so that if the service misses 5 OPTIONS checks, Kamailio should mark that destination as "inactive".
But, it should keep probing it, so Kamailio can detect when the destination comes back up. So as I understand it, that's the status "IP".
And, Kamailio should stop including that destination in the responses from ds_select_dst().
And all of that is behaving as expected, EXCEPT that last bit - ds_select_dst continues to include the IP (inactive) destination in responses.
I added
ds_mark_dst("ip");
in the event of a 500 or branch failure response, but I don't understand why this is needed, because the destination is already in "IP" mode.
So seemingly Kamailio knows the destination is inactive, but ds_select_dst isn't acting on it unless I manually mark the target also.
Perhaps I am overlooking an option?
Regards,
Jawaid
On 3/13/23, 9:51 AM, "Henning Westerholt" <hw@gilawa.com <mailto:hw@gilawa.com>> wrote:
Hello,
probing means in this context sending OPTIONS pings, yes.
In mode 1 you can disable the probing by setting flag 4 to the destination in the dispatcher file, according to the docs.
Cheers,
Henning
-----Original Message-----
From: Henning Westerholt <hw@gilawa.com <mailto:hw@gilawa.com>>
Sent: Montag, 13. März 2023 15:55
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org <mailto:sr-users@lists.kamailio.org>>
Subject: [SR-Users] Re: Dispatcher behavior
Hello,
not sure what the "auto-probing" mode is, but you can configure the dispatcher OPTIONS ping behaviour with that parameter:
https://kamailio.org/docs/modules/5.5.x/modules/dispatcher.html#dispatcher.p.ds_probing_mode <https://kamailio.org/docs/modules/5.5.x/modules/dispatcher.html#dispatcher.p.ds_probing_mode>
Cheers,
Henning
-----Original Message-----
From: Jawaid Bazyar <bazyar@gmail.com <mailto:bazyar@gmail.com>>
Sent: Montag, 13. März 2023 14:33
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org <mailto:sr-users@lists.kamailio.org>>
Subject: [SR-Users] Re: Dispatcher behavior
Hi Alex,
I don't see "auto-probing" in the documentation.. here is my dispatcher config that I snatched from somewhere on the Internet.
modparam("dispatcher", "db_url", "mysql://xxxxxxx/kamailio") #Use DBURL variable for database parameters
modparam("dispatcher", "flags", 2) # If flag 2 is set, then the failover support is enabled.
modparam("dispatcher", "table_name", "dispatcher")
modparam("dispatcher", "ds_ping_interval", 5) #How often to ping destinations to check status
modparam("dispatcher", "ds_ping_method", "OPTIONS") #Send SIP Options ping
modparam("dispatcher", "ds_probing_threshold", 5) #How many failed pings in a row do we need before we consider it down
modparam("dispatcher", "ds_inactive_threshold", 10) #How many sucessful pings in a row do we need before considering it up
modparam("dispatcher", "ds_ping_latency_stats", 1) #Enables stats on latency
modparam("dispatcher", "ds_probing_mode", 1) #Keeps pinging gateways when state is known (to detect change in state)
On 3/12/23, 8:28 PM, "Alex Balashov" <abalashov@evaristesys.com <mailto:abalashov@evaristesys.com> <mailto:abalashov@evaristesys.com <mailto:abalashov@evaristesys.com>>> wrote:
Unless you have auto-probing enabled, yes.
> On Mar 12, 2023, at 9:14 PM, Jawaid Bazyar <bazyar@gmail.com <mailto:bazyar@gmail.com> <mailto:bazyar@gmail.com <mailto:bazyar@gmail.com>>> wrote:
>
> Hi, is this expected behavior?
> I have two target hosts in a dispatcher set, 10.20.20.118 (prio 5) and 10.20.20.252 (prio 10).
> When I have 10.20.20.252 turned off, dispatcher still tries to send packets to that host, even when the status flags are IP.
> root@vs-rs01:/etc/kamailio# kamcmd dispatcher.list {
> NRSETS: 1
> RECORDS: {
> SET: {
> ID: 1
> TARGETS: {
> DEST: {
> URI: sip:10.20.20.252:5060
> FLAGS: IP
> PRIORITY: 10
> LATENCY: {
> AVG: 0.000000
> STD: 0.000000
> EST: 0.000000
> MAX: 0
> TIMEOUT: 62
> }
> }
> DEST: {
> URI: sip:10.20.20.118:5060
> FLAGS: AP
> PRIORITY: 5
> LATENCY: {
> AVG: 3.876000
> STD: 2.965000
> EST: 5.058000
> MAX: 14
> TIMEOUT: 0
> }
> }
> }
> }
> }
> }
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Evariste Systems LLC
Web: https://evaristesys.com <https://evaristesys.com> <https://evaristesys.com> <https://evaristesys.com>>
Tel: +1-706-510-6800
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