How to check for presence of a file from a route? (Or any other way to tell kamailio not to accept new calls)
Hi
I'm still looking for a better way to tell Kamailio that we want to enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial state. Not good, if I want to make sure the node stays in maintenance mode after a restart as for example after pushing a config change via ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE] { if (!has_totag() && is_method("INVITE")) { if (file_exist("/etc/kamailio/maintenance.flag")) { xlog("L_ERR", "Maintenance flag present! Rejecting INVITE\n"); t_send_reply("503", "Maintenance mode - no new calls accepted"); exit; } } }
Mit freundlichen Grüssen
-Benoît Panizzon-
On 13.11.23 11:17, Benoit Panizzon via sr-users wrote:
Hi
I'm still looking for a better way to tell Kamailio that we want to enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial state. Not good, if I want to make sure the node stays in maintenance mode after a restart as for example after pushing a config change via ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE] { if (!has_totag() && is_method("INVITE")) { if (file_exist("/etc/kamailio/maintenance.flag")) { xlog("L_ERR", "Maintenance flag present! Rejecting INVITE\n"); t_send_reply("503", "Maintenance mode - no new calls accepted"); exit; } } }
I would really avoid checking/reading a file for every new sip call, especially on production system with decent volume of calls. But if suits your needs and system, look at corex module, there is a function to read the content of a file.
I would rather find a solution where the state is kept in memory, like still using $shv(...) and change kamailio.cfg to init in maintenance mode via pv parameter which can set $shv(...) at startup, or using htable with database backend that loads at startup.
Cheers, Daniel
Hello,
just to add another common method, you could also just use a cfg file variable that you can modify later with kamcmd, kamcli etc.. There is a prepared variable (pstn..) in the default cfg.
Cheers,
Henning
Or better yet use an htable
On Mon, 13 Nov 2023 at 13:31, Henning Westerholt via sr-users < sr-users@lists.kamailio.org> wrote:
Hello,
just to add another common method, you could also just use a cfg file variable that you can modify later with kamcmd, kamcli etc.. There is a prepared variable (pstn..) in the default cfg.
Cheers,
Henning
-- Henning Westerholt - https://skalatan.de/blog/ Kamailio services - https://gilawa.com
-----Original Message----- From: Daniel-Constantin Mierla via sr-users <sr-users@lists.kamailio.org
Sent: Montag, 13. November 2023 11:46 To: Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org Cc: Daniel-Constantin Mierla miconda@gmail.com Subject: [SR-Users] Re: How to check for presence of a file from a
route? (Or
any other way to tell kamailio not to accept new calls)
On 13.11.23 11:17, Benoit Panizzon via sr-users wrote:
Hi
I'm still looking for a better way to tell Kamailio that we want to enter 'maintenance' and STAY in maintenance after a restart.
Maintenance is: Reject all messages without totag with 503 to prevent creating new dialogues.
I could use a shared pv and the use kamcmd pv.shvSet to toggle it.
But when kamailio is restarted, that pv is also reset to it's initial state. Not good, if I want to make sure the node stays in maintenance mode after a restart as for example after pushing a config change via ansible.
So what comes to my mind is to check for the presence of a file.
something like:
route[CHECK_MAINTENANCE] { if (!has_totag() && is_method("INVITE")) { if (file_exist("/etc/kamailio/maintenance.flag")) { xlog("L_ERR", "Maintenance flag present! Rejecting
INVITE\n");
t_send_reply("503", "Maintenance mode - no newcalls accepted");
exit; } }}
I would really avoid checking/reading a file for every new sip call,
especially on
production system with decent volume of calls. But if suits your needs
and
system, look at corex module, there is a function to read the content of
a file.
I would rather find a solution where the state is kept in memory, like
still using
$shv(...) and change kamailio.cfg to init in maintenance mode via pv parameter which can set $shv(...) at startup, or using htable with
database
backend that loads at startup.
Cheers, Daniel
-- Daniel-Constantin Mierla (@ asipto.com) twitter.com/miconda -- linkedin.com/in/miconda Kamailio Consultancy and Development Services
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Benoit Panizzon -
Daniel-Constantin Mierla -
David Villasmil -
Henning Westerholt