Christopher Browne wrote: > We need to schedule a script to run on ONLY ONE of the N hosts. The > catch is that any host could be down at any moment in the future, so > schedulling cronjob on one of the hosts is not a reliable option. Also > the job cannot be run more that once (ie cannot be run from multiple > hosts).
David Masterson wrote: > Simplisticly, that could probably be done by creating (lock) files. > The cfengine host that creates the file first wins. Of course, this > assumes an NFS setup You could also use a database or a CGI application. There is no reason to depend on NFS to keep state. This is not an easy problem though. For example, what if the host providing the locking mechanism (NFS server, database server, whatever) is down? The more important the service, the more redundancy you need, and that costs, particularly when you are talking about read-write data (such as locking). Best, Brendan -- Senior System Administrator The University of Chicago Department of Computer Science http://www.cs.uchicago.edu/people/brendan http://praksys.blogspot.com/ _______________________________________________ Help-cfengine mailing list Help-cfengine@gnu.org http://lists.gnu.org/mailman/listinfo/help-cfengine
