> On 21. Dec 2017, at 09:02, Joosten, Markus <markus.joos...@plumbe.de> wrote: > > Am 2017-12-21 04:20, schrieb Jayapandian Ponraj: >> Thanks for the reply >> We do heavily use apply rules based on host variables and for hostgroup >> definitions, but once in a while we come across a service which is spread >> across 2 or 3 hosts which don't share anything in common. We can go ahead >> add separate service definition for each of them(not preferred) or write an >> apply rule with a reflex matching those specific hosts. >> Adding plain service definition for a single host and switching over to >> apply rules when 2 or 3 hosts are involved feels counter-intuitive. Since >> service definitions will be added by many teams would like to keep it >> simple.. >> So need a simple and elegant solution keeping in mind the common pitfalls. >> https://www.icinga.com/2016/04/28/avoiding-common-pitfalls-with-apply-rules/ >> So idea is to keep it simple and avoid the pitfalls and performance issues. > Hi there, > I'd say there are at least a few ways to keep it simple and achieve your > solution. > > Probably my preferred solution would be to use an explicit assign statement > within your apply rule for every host: > > assign where host.name == "host1" > assign where host.name == "host2" > assign where host.name == “host3"
Keep in mind that each assign where expression is evaluated on all host objects. This is rather expensive compared to just one logical expression which combines the conditions with &&. Furthermore it can be easily made more readable using the in operator and array notation. assign where host.name in [ “h1”, “h2" ] Still, I’d suggest to use more generic patterns, as hostnames may be changed and modifying the apply rules later on is cumbersome. Kind regards, Michael > > Another possibility is to use a host group for these hosts, but to me this > seems counter-intuitive as it groups hosts together which just share a > service. > > Regards, > Markus > _______________________________________________ > icinga-users mailing list > icinga-users@lists.icinga.org > https://lists.icinga.org/mailman/listinfo/icinga-users _______________________________________________ icinga-users mailing list icinga-users@lists.icinga.org https://lists.icinga.org/mailman/listinfo/icinga-users
