[Asterisk-Users] Asterisk Redundency

Watkins, Bradley Bradley.Watkins at compuware.com
Tue Oct 25 12:10:22 MST 2005 

I would certainly be interested in this and could perhaps help out.  I'm
currently building a heartbeat/LVS/ldirectord load-balanced cluster that
could use some significantly better health checking(which was my next step).
Since ldirectord is already written in perl, it would avoid having to call
sipsak externally and parsing the output.  The SIP Options query that
ldirectord currently uses does not work.



-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Adam Moffett
Sent: Tuesday, October 25, 2005 2:35 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] Asterisk Redundency


A SIP registration as a monitor is not a bad idea at all.  The 
registration process is not too terribly complex, and I think I could 
write a perl script that could attempt registration when supplied with a 
host, username, and password.

No promises, but if I can put something together I'll post it.

Still, any ideas from anybody on how to make an automatic test call or 
to simulate a call somehow would be appreciated.



Benjamin Lawetz wrote:

>Ok, I tried something slightly different.
>
>I modified the existing the udp.monitor (or was it the tcp.monitor) of 
>mon and basically sending a "sniffed" SIP Registration packet which I 
>send to the asterisk server. If I don't receive an answer within a set 
>time. The monitor sends an error.
>
>It tells you if the server is at least answering SIP. Mind you I once 
>had a server freeze, but the monitoring kept getting an answer. So not 
>100% fool-proof, but save my *** in the past :-)
>
>-----Original Message-----
>From: asterisk-users-bounces at lists.digium.com
>[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Adam 
>Moffett
>Sent: October 25, 2005 9:51 AM
>To: Asterisk Users Mailing List - Non-Commercial Discussion
>Subject: Re: [Asterisk-Users] Asterisk Redundency
>
>
>
>Benjamin Lawetz wrote:
>
>  
>
>> 
>>
>>    
>>
>>>Since I can't do that, what I've settled on is heartbeat + mon.
>>>Heartbeat will monitor for a system level failure and switch to the 
>>>backup
>>>   
>>>
>>>      
>>>
>>machine if neccesary; and mon will watch the asterisk (or any
>> 
>>
>>    
>>
>>>other) service and restart it and/or alert me if it fails.
>>>   
>>>
>>>      
>>>
>>What kind of monitor are you using to monitor asterisk?
>>
>>
>> 
>>
>>    
>>
>Sorry for my slow response.  My asterisk monitor right now is 
>embarrassingly simple.  All it does is execute show uptime and look for 
>output starting with "System", see below.  Obviously the method has 
>limitations.  1) It will only really only tell me that the daemon is 
>running, not that it's able to carry any calls.  2) It only works on 
>localhost.
>
>Input on how to test a remote instance of asterisk would be welcome, as 
>well as a method of making a test call or reliably testing for the 
>ability to make calls.  My impression is that this would require 
>asterisk to have a "Dial" command in the CLI, or a linux SIP client 
>that I could execute from the shell.  I'm not aware of the existence of 
>either.
>
>Any other simple and reliable methods of testing asterisk's condition 
>would be welcome.
>
>The alerts, by the way are pretty simple as well.  See the excerpt from 
>mon.cf below.  restartasterisk.alert does exactly what it says.
>stopeverything.alert shuts down heartbeat, which will cause another node in
>the cluster to take over...in fact that node will start mon, which will
then
>use the restartasterisk.alert to start up asterisk.  Asterisk only starts
on
>the backup machine when the primary fails so that config changes replicated
>from the primary will take effect.  Total downtime should be < 3min.  Which
>will let me hit 5-nine if it only happens once a year ;)
>
>Config changes are replicated via rsync and ssh every few minutes.
>Voicemails are also copied from primary to backup by rsync.  One thing I
>still need to do is make rsync stop attempting to replicate files when the
>failover occurrs.  That will probably just require another alert below the
>"stopeverything.alert".
>
>The replication of couse means that this setup will not protect me from 
>a bad config change that breaks asterisk, as that change will be 
>replicated throughout the cluster.  So all significant config changes 
>should be tested on a standalone box.
>
>
>[root at phones2 mon]# cat /usr/lib/mon/mon.d/asterisk.monitor
>#!/bin/sh
>##can only check localhost.  Always checks localhost regardless of 
>input
>
>        SHOW_UPTIME=`/usr/sbin/asterisk -rx "show uptime" | /bin/cut -b
1-6`
>        if [ $SHOW_UPTIME == "System" ]; then
>                exit 0
>        else
>                echo "localhost"
>                exit 1
>        fi
>
>
> From mon.cf:
>
>watch asterisk
>        service asterisk
>                description asterisk pbx on localhost
>                interval 10s
>                monitor asterisk.monitor
>                period wd {Sun-Sat}
>                        alert mail.alert adam at plexicomm.net
>                        alert restartasterisk.alert adam at plexicomm.net
>                        alertevery 30s
>        service asterisk-failover
>                description checking if we need to stop heartbeat
>                interval 10s
>                monitor asterisk.monitor
>                period wd {Sun-Sat}
>                        alert stopeverything.alert adam at plexicomm.net
>                        alertafter 5 3m
>
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