Re: [Pdns-users] Rép. : RE: fail over for web server

Mon Sep 3 16:16:32 UTC 2007

Hello,

This sort of a setup would be very simple to implement by creating an LVS
cluster (http://www.linuxvirtualserver.org/). I am currently using LVS with
great success, to balance load between four machines that run the
pdns_recursor. There are projects under LVS which allow you to also setup
failover directors using vrrpv2, which also monitor and dynamically adjust
the cluster nodes based on availability (http://www.keepalived.org/).

I thoroughly recommend you give it a shot. Feel free to drop me a line if
you require any further input on this subject.

Regards,

Daniel

Jean Chiappini-2 wrote:
> 
> Thank you, I will try with a hardware solution.
> 
> Regards
> 
> Jean
> 
>>>> Darren Gamble <darren.gamble at sjrb.ca> 08/15/07 6:32  >>>
> Good day,
> 
> You will not be able to implement this with just pdns.  There is no way
> for the DNS server to know which servers are online or offline on its
> own.  The "failover" you read about is likely that for the DNS server
> itself.
> 
> As Kenneth noted, if you have any tools that can identify the status of
> the services, they can issue the appropriate commands to your DNS
> server.  Note that this would require a very low TTL value on the RR to
> be effective.
> 
> Note that the most common business solution to this problem is to use
> load-balancing technology- either a hardware server pair in front of the
> servers, or software on both web servers to manage a VIP.  But, this is
> just the most common solution, not the only one.
> 
> FYI,
> 
> ============================
> Darren Gamble
> Systems Architect, Regional Services
> Shaw Cablesystems GP
> 630 - 3rd Avenue SW
> Calgary, Alberta, Canada
> T2P 4L4
> (403) 781-4948
>  
> 
>> -----Original Message-----
>> From: pdns-users-bounces at mailman.powerdns.com [mailto:pdns-users-
>> bounces at mailman.powerdns.com] On Behalf Of Jean Chiappini
>> Sent: Wednesday, August 15, 2007 7:55 AM
>> To: ktm at rice.edu 
>> Cc: pdns-users at mailman.powerdns.com 
>> Subject: Re: [Pdns-users] fail over for web server
>> 
>> Thank you for your response. Yes it is one possiblity, we use
> zabbix,
>> but I prefered a mechanism based on pdns directly...
>> 
>> Regards
>> 
>> Jean
>> 
>> >>> Kenneth Marshall <ktm at rice.edu> 08/15/07 3:24 PM >>>
>> Jean,
>> 
>> One typical way to implement this is to use Nagios to monitor
>> your web servers. Then if one goes offline, issue the appropriate
>> update to the PDNS database.
>> 
>> Ken
>> 
>> On Wed, Aug 15, 2007 at 01:43:28PM +0200, Jean Chiappini wrote:
>> > Hello,
>> >
>> > I setup a pdns with approximately 90 domains. For all domains we
> have
>> > two web servers. Now, if a web server is down, 50% of the request
>> failed
>> > because the web server is not available due to down time.
>> >
>> > I read in the documentation that it is possible to make fail over
> with
>> > pdns, but I don't fin how make this...
>> > Someone has tested the failover with pdsn ? In case of yes, could
> you
>> > explain me how I need to setup my pdns please ?
>> >
>> > Regards
>> >
>> > Jean
>> > ___________________________________________________________
>> > Le contenu de ce courriel est uniquement r??serv?? ?? la personne
> ou
>> > l'organisme ?? qui il est destin??. Si vous n'??tes pas le
>> destinataire
>> > pr??vu, veuillez nous en informer au plus vite et d??truire le
>> pr??sent
>> > courriel. Dans ce cas, il ne vous est pas permis de copier ce
>> courriel,
>> > de le distribuer ou de l'utiliser de quelque mani??re que ce soit.
>> >
>> > The content of this e-mail is intended only and solely for the use
>> > of the named recipient or organisation. If you are not the named
>> > recipient, please inform us immediately and delete the present
> e-mail.
>> 
>> > In this case, you are nor allowed to copy, distribute or use this
>> > e-mail in any way.
>> > ___________________________________________________________
>> > _______________________________________________
>> > Pdns-users mailing list
>> > Pdns-users at mailman.powerdns.com 
>> > http://mailman.powerdns.com/mailman/listinfo/pdns-users 
>> >
>> 
>> ___________________________________________________________
>> Le contenu de ce courriel est uniquement réservé à la personne ou
>> l'organisme à qui il est destiné. Si vous n'êtes pas le destinataire
>> prévu, veuillez nous en informer au plus vite et détruire le présent
>> courriel. Dans ce cas, il ne vous est pas permis de copier ce
> courriel,
>> de le distribuer ou de l'utiliser de quelque manière que ce soit.
>> 
>> The content of this e-mail is intended only and solely for the use
>> of the named recipient or organisation. If you are not the named
>> recipient, please inform us immediately and delete the present
> e-mail.
>> In this case, you are nor allowed to copy, distribute or use this
>> e-mail in any way.
>> ___________________________________________________________
>> _______________________________________________
>> Pdns-users mailing list
>> Pdns-users at mailman.powerdns.com 
>> http://mailman.powerdns.com/mailman/listinfo/pdns-users
> 
> ___________________________________________________________
> Le contenu de ce courriel est uniquement réservé à la personne ou 
> l'organisme à qui il est destiné. Si vous n'êtes pas le destinataire
> prévu, veuillez nous en informer au plus vite et détruire le présent
> courriel. Dans ce cas, il ne vous est pas permis de copier ce courriel,
> de le distribuer ou de l'utiliser de quelque manière que ce soit.
> 
> The content of this e-mail is intended only and solely for the use 
> of the named recipient or organisation. If you are not the named 
> recipient, please inform us immediately and delete the present e-mail. 
> In this case, you are nor allowed to copy, distribute or use this 
> e-mail in any way.
> ___________________________________________________________
> _______________________________________________
> Pdns-users mailing list
> Pdns-users at mailman.powerdns.com
> http://mailman.powerdns.com/mailman/listinfo/pdns-users
> 
> 

-- 
View this message in context: http://www.nabble.com/fail-over-for-web-server-tf4272591.html#a12464256
Sent from the PowerDNS mailing list archive at Nabble.com.