Hi David, Thank you for the explanation you gave about anycast. Heartbeat doesn't seem to implement this feature. Do i have to conclude that it is simply impossible to build a cluster on two different subnets with Heartbeat?
Regards, Smain Selon David Lee <[EMAIL PROTECTED]>: > 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.) > > > -- > > : David Lee I.T. Service : > : Senior Systems Programmer Computer Centre : > : UNIX Team Leader Durham University : > : South Road : > : http://www.dur.ac.uk/t.d.lee/ Durham DH1 3LE : > : Phone: +44 191 334 2752 U.K. : > _______________________________________________ > Linux-HA mailing list > [email protected] > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems > _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
