This is something that will come in Nova 2. It is not as easy to answer as you might think, as you have to know which classes can or have been defined on each machine (simultaneously).
The simplest way to approach this is to measure each system and observe the probabilities. As an immediate (if primitive) workaround, you could use a reports promise with the named class to send a message to syslog, or an email etc. Justin Lloyd wrote: > Hi all, > > > > As we’ve been moving forward with our Nova implementation and developing > an appropriate procedure for getting approval to make changes to our > Cfengine policy, I’ve realized that it would be incredibly important to > know which systems will be affected by a policy change. So, given a > class expression (“oracle.!gold”, “web_server|ftp_server”, etc.), I’d > like a way of using Cfengine to generate a list of hosts that match the > expression. > > > > My initial thought is derived from how a Nova policy server gathers > statistics files from its clients. I could have the policy server fetch > /var/cfengine/state/allclasses.txt from every host and then run a script > on the policy server could use those files as the data from which it > could generate such a list. For example, here’s the most complicated > class expression in our policy: > > > > pserver$ list-hosts > “!unix_lab.!nonstandard_sudoers_host.(linux|(solaris.zone_global.!usr_local_is_nfs))” > > matchinghost1 > > matchinghost2 > > etc. > > pserver$ > > > > Anyone have any other ideas? Anyone know if such a capability will be > added to Nova 2.0? > > > > Thanks, > > Justin > > > > > > *Justin C. Lloyd* > > Senior Unix Infrastructure Engineer > > *Office*: 303.684.4166 > > > Description: Description: cid:image001.gif@01CB11F3.8C8CBD70 > www.digitalglobe.com <http://www.digitalglobe.com/> > > > > This electronic communication and any attachments may contain confidential > and proprietary > information of DigitalGlobe, Inc. If you are not the intended recipient, or > an agent or employee > responsible for delivering this communication to the intended recipient, or > if you have received > this communication in error, please do not print, copy, retransmit, > disseminate or > otherwise use the information. Please indicate to the sender that you have > received this > communication in error, and delete the copy you received. DigitalGlobe > reserves the > right to monitor any electronic communication sent or received by its > employees, agents > or representatives. > > > ------------------------------------------------------------------------ > > _______________________________________________ > Help-cfengine mailing list > Help-cfengine@cfengine.org > https://cfengine.org/mailman/listinfo/help-cfengine -- Mark Burgess ------------------------------------------------- Professor of Network and System Administration Oslo University College, Norway Personal Web: http://www.iu.hio.no/~mark Office Telf : +47 22453272 ------------------------------------------------- _______________________________________________ Help-cfengine mailing list Help-cfengine@cfengine.org https://cfengine.org/mailman/listinfo/help-cfengine
