Well I don't follow:
"You can have a pool of primary that it routes across, then backup systems
that are only used when all primary systems are unavailable."
When you are saying that "the backup systems that are used when primary systems
are unavailable", how do they decide to take over? How do they know that the
other systems are unavailable?
Are you saying that they depend on third party components like the ones you
mentioned (Keepalived etc)? In this case, what is the most suitable tool to be
used along with HAProxy? Is there a reference manual for this somewhere?
________________________________
From: David Coulson <da...@davidcoulson.net>
To: Hermes Flying <flyingher...@yahoo.com>
Cc: Baptiste <bed...@gmail.com>; "haproxy@formilux.org" <haproxy@formilux.org>
Sent: Thursday, November 29, 2012 8:21 PM
Subject: Re: HAproxy and detect split-brain (network failures)
HAProxy only does primary and backup in terms of active backend systems - You
can have a pool of primary that it routes across, then backup systems that are
only used when all primary systems are unavailable.
There is no concept of a cluster in terms of haproxy instances,
although you can run more than one and manage them via something
like pacemaker, keepalived or rgmanager.
On 11/29/12 1:19 PM, Hermes Flying wrote:
Hi,
>From a quick look into HAProxy, I see that it is a Primary/backup
>architecture. So isn't ensuring that both "nodes" don't become primary part of
>HAProxy's primary/backup "protocol" ?
>
>
>From: Baptiste mailto:bed...@gmail.com
>To: Hermes Flying mailto:flyingher...@yahoo.com
>Cc: mailto:haproxy@formilux.org mailto:haproxy@formilux.org
>Sent: Thursday, November 29, 2012 3:02 PM
>Subject: Re: HAproxy and detect split-brain (network failures)
>
>Hi,
>
>This is not HAProxy's role, this is the tool you use to
ensure high
>availability to do that.
>
>I could see a way where HAProxy can report one interface
failing,
>maybe this could help you to detect if you're in a split
brain
>situation.
>
>cheers
>
>
>
>On Thu, Nov 29, 2012 at 11:51 AM, Hermes Flying <flyingher...@yahoo.com> wrote:
>> Hi,
>> I am looking into using HAProxy as our load balancer.
>> I see that you are using a primary/backup approach. I
was wondering how does
>> HAProxy (if it does) address split-brain situation? Do
you have a mechanism
>> to detect and avoid it? Do you have some standard
recommendation to all
>> those using your solution?
>>
>> Thanks
>
>
>
