On Wed, 5 Nov 2008, Matthew Soffen wrote:
On Wed, 2008-11-05 at 07:54 +0100, Smain KAHLOUCH wrote:
Hi,
Do somebody know how to make heartbeat work when two nodes are on two
different subnets ?
Do you need more information ?
Thanks,
Smain
Hi all !
I was wondering if there is a simple way to configure heartbeat in order to work
across the network.
I mean, the two nodes are on two different subnets. (OpenLDAP Cluster).
I looked for information about that. I just found the following topic but the
method seems to be complicated.
http://www.gossamer-threads.com/lists/linuxha/users/31977#31977
Thank you for your help :)
Smain
[...]
Hi Smain,
Are you really sure that is what you want to do ?
How are you going to have them share a single IP address (the cluster
address) if it isn't portable across the 2 subnets ?
The single IP address might be capable of being portable, by using
"anycast".
Disclaimer: I have no experience whatsoever of "anycast". But it does
seem to be there, and in real use.
Although I've been using IP networking for years, that term "anycast" was
new to me just last year. But apparently it, too, has been around for
years (but presumably very quiet). And it is even, apparently, used for
some of the DNS root servers, giving a single IP address multiple-instance
presence on different continents. Or something like that.
But "anycast" is not so much heartbeat-like failover; rather multiple
running instances, with clients accessing their nearest instance, as
determined by routing deep in the network. (Your client accesses one
instance; mine accesses a different one; yet both (physical) instances
offer the same (virtual) IP address because the routing supports it.)
And if a particular instance failed, the routing would simply find another
instance of that same IP address. (Or, again, something like that.)
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