Re: upstream server and ip hash Folks, Can anyone help me out? To clarify: I am just looking for confirmation as i add an upstream server, will hash change for existing users (these are using XMPP sessions so they will suffer disruption of service). Thanks, -kvh kvhdude wrote > > Hi, > > I need a clarification regarding ip_hash directive : > Would adding a new upstream server affect existing users that are bound to > some other servers? > I am trying to dynamically scale up the servers (using scalr) in EC2 > setting. > > I am guessing it won't, but i needed to be sure. > > thanks, > -kvh > -- View this message in context: http://nginx.2469901.n2.nabble.com/upstream-server-and-ip-hash-tp7580949p7581128.html Sent from the nginx mailing list archive at Nabble.com. _______________________________________________ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx http://www.serverphorums.com/read.php?5,540693,540693#msg-540693 Fri, 24 May 2013 17:56:20 +0200 Phorum 5.2.18 http://www.serverphorums.com/read.php?5,540693,540911#msg-540911 Re: upstream server and ip hash http://www.serverphorums.com/read.php?5,540693,540911#msg-540911 Thanks for your response.
-kvh

On Mon, Aug 6, 2012 at 2:08 PM, Ruslan Ermilov [via nginx] <
ml-node+s2469901n7581131h55@n2.nabble.com> wrote:

> On Sun, Aug 05, 2012 at 10:10:39PM -0700, kvhdude wrote:
> > Folks,
> > Can anyone help me out?
> > To clarify: I am just looking for confirmation as i add an upstream
> > server, will hash change for existing users (these are using XMPP
> sessions
> > so they will suffer disruption of service).
>
> Yes, it will. The hashing implemented by ip_hash is not consistent.
>
> There's limited support for preserving hash values when a server in
> an upstream goes down, in the form of the "down" parameter, please
> see http://nginx.org/r/ip_hash for details.
>
> Adding consistent hashing is planned in future versions of nginx.
>
> > kvhdude wrote
> > >
> > > Hi,
> > >
> > > I need a clarification regarding ip_hash directive :
> > > Would adding a new upstream server affect existing users that are
> bound to
> > > some other servers?
> > > I am trying to dynamically scale up the servers (using scalr) in EC2
> > > setting.
> > >
> > > I am guessing it won't, but i needed to be sure.
>
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http://mailman.nginx.org/mailman/listinfo/nginx]]> kvhdude Nginx Mon, 06 Aug 2012 14:50:02 +0200 http://www.serverphorums.com/read.php?5,540693,540751#msg-540751 Re: upstream server and ip hash http://www.serverphorums.com/read.php?5,540693,540751#msg-540751 > Folks,
> Can anyone help me out?
> To clarify: I am just looking for confirmation as i add an upstream
> server, will hash change for existing users (these are using XMPP sessions
> so they will suffer disruption of service).

Yes, it will. The hashing implemented by ip_hash is not consistent.

There's limited support for preserving hash values when a server in
an upstream goes down, in the form of the "down" parameter, please
see http://nginx.org/r/ip_hash for details.

Adding consistent hashing is planned in future versions of nginx.

> kvhdude wrote
> >
> > Hi,
> >
> > I need a clarification regarding ip_hash directive :
> > Would adding a new upstream server affect existing users that are bound to
> > some other servers?
> > I am trying to dynamically scale up the servers (using scalr) in EC2
> > setting.
> >
> > I am guessing it won't, but i needed to be sure.

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http://mailman.nginx.org/mailman/listinfo/nginx]]> Ruslan Ermilov Nginx Mon, 06 Aug 2012 10:40:02 +0200 http://www.serverphorums.com/read.php?5,540693,540693#msg-540693 Re: upstream server and ip hash http://www.serverphorums.com/read.php?5,540693,540693#msg-540693 Can anyone help me out?
To clarify: I am just looking for confirmation as i add an upstream
server, will hash change for existing users (these are using XMPP sessions
so they will suffer disruption of service).
Thanks,
-kvh


kvhdude wrote
>
> Hi,
>
> I need a clarification regarding ip_hash directive :
> Would adding a new upstream server affect existing users that are bound to
> some other servers?
> I am trying to dynamically scale up the servers (using scalr) in EC2
> setting.
>
> I am guessing it won't, but i needed to be sure.
>
> thanks,
> -kvh
>




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http://mailman.nginx.org/mailman/listinfo/nginx]]> kvhdude Nginx Mon, 06 Aug 2012 07:20:04 +0200