mailing list archives
FW: wackamole 1.0
From: Bill Manning <bmanning () ISI EDU>
Date: Wed, 5 Sep 2001 08:01:07 -0700 (PDT)
We interupt the normal NANOG threads for this potentially interesting item.
% We at the Center for Networking and Distributed Systems at Johns Hopkins
% (http://www.cnds.jhu.edu) are happy to announce the release of Wackamole,
% a software tool that provides N-Way Fail Over for IP Addresses in a cluster.
% It is available here: http://www.backhand.org/wackamole/ and is released
% under the CNDS open source license
% which is essentially a version of BSD license with a somewhat stronger
% Wackamole is a tool that helps with making a cluster highly available.
% It manages a bunch of virtual IPs that should be available to the outside
% world at all times. Wackamole ensures that exactly one machine within the
% cluster is
% listening on each virtual IP address that Wackamole manages.
% If it discovers that particular machines within the cluster are not alive,
% it will
% almost immediately ensure that other machines acquire the virtual IP
% addresses the
% down machines were managing. At no time will more than one connected machine
% responsible for any virtual IP.
% Wackamole also works toward achieving a balanced distribution of the public
% within the cluster it manages.
% How it works:
% Wackamole runs as root on each of the cluster's machines. It uses the
% notifications provided by the Spread Toolkit (http://www.spread.org, also
% under a similar license) to generate a consistent state that is agreed upon
% all of the connected Wackamole instances.
% Wackamole uses this knowledge to ensure that all of the public IP addresses
% by the cluster will be covered by exactly one Wackamole instance.
% Wackamole is the newest component in the Backhand project
% adding to its predecessors mod_backhand and mod_log_spread.
% For questions or comments - e-mail wackamole () backhand org
% Best regards,
% :) Yair. http://www.cnds.jhu.edu
- FW: wackamole 1.0 Bill Manning (Sep 05)