Re: ldirectord: active sessions on a dead server weighted 0

Thanks alot Simon!  I guess i missed that one!

On May 30, 2006, at 4:12 AM, Simon Luff wrote:

> hi James,
>
> The setting you want to alter here is the quiescent setting. From  
> the ldirectord man page:
>
>> quiescent = [yes│no]
>> If yes, then when real or failback servers are determined to be down,
>> they are not actually removed from the kernel's LVS table. Rather,
>> their weight is set to zero which means that no new connections will
>> be accepted. This has the side effect, that if the real server has
>> persistent connections, new connections from any existing clients
>> will continue to be routed to the real server, until the persistant
>> timeout can expire. See ipvsadm for more information on persistant
>> connections.
>
> Setting quiescent = no will make sure that all connections will  
> immediately stop using the dead real server.
>
> The persistent value is intended for making multiple connections  
> from the same client end up on the same server. Whilst according to  
> documentation it should mean connections would stop to the dead  
> server after the persistence timout, I have noticed the behaviour  
> that you describe (when quiescent = yes).
>
> best regards,
> Simon.
>
> James Ziller wrote:
>> Thanks for the reply.  It surprises me that setting the  
>> persistent  value would cause ldirectord to not failover sessions  
>> even when a  server is completely _dead_, what good is that?  I  
>> was considering  that this could be the issue but  it had been  
>> over ten minutes  since  I timed the server going down(well passed  
>> the time a session should  have been persistant,120 seconds) and  
>> certain clients were still not  able to make an http connection...
>> On May 24, 2006, at 1:46 PM, Terry, Jason wrote:
>>> If you don't want your server to behave like this then remove  
>>> this  line
>>> persistent=120
>>>
>>> But you'll lose your persistent connections if you do.  I'm not   
>>> sure if
>>> there is a "best of both worlds"...
>>>
>>> -----Original Message-----
>>> From: [email protected]
>>> [mailto:[email protected]] On Behalf Of James
>>> Ziller
>>> Sent: Wednesday, May 24, 2006 11:17 AM
>>> To: [email protected]
>>> Subject: ldirectord: active sessions on a dead server weighted 0
>>>
>>> Greetings folks,
>>>
>>> I am hoping someone here could give me advice on an issue I am  
>>> having
>>> with ldirectord.  I am load balancing between two apache servers,
>>> works great except when one server goes down ipvsadm still shows
>>> active sessions on it even though the weight is dropped down to 0.
>>> When this happens, certain clients(presumably the ones with active
>>> sessions on the dead server) can no longer access the http server
>>> through the load balancer, while other clients have no problems.
>>> Once the dead server is brought back up all connection issues go
>>> away.  Any ideas why everything isnt failing over?  Another  
>>> factor is
>>> that many of the connections are made through an ISA proxy (any
>>> compatibility concerns there?). Heres my config:
>>>
>>> # Global Directives
>>> checktimeout=10
>>> checkinterval=5
>>> fallback=127.0.0.1:80
>>> autoreload=no
>>> logfile="/var/log/ldirectord.log"
>>> #logfile="local0"
>>> quiescent=yes
>>>
>>> #incoming standard web traffic
>>> virtual=199.27.3.33:80
>>>          real=192.168.124.6:80 masq
>>>          real=192.168.124.7:80 masq
>>>          fallback=127.0.0.1:80
>>>          persistent=120
>>>          service=http
>>>          request="index.html"
>>>          receive="Test Page"
>>>          scheduler=wlc
>>>          protocol=tcp
>>>          checktype=negotiate
>>>
>>> Thanks,
>>> James
>
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