David, if by occasion you experience concurrent cf-agent runs, there's a situation possible when one instance locks insert_lines promises and another one locks delete_lines promises. There were discussions with Mark about locking the whole file to prevent such undesired concurrency overlaps, and I hope he will implement it in the next release.
2011/3/14 David Lee <david....@ecmwf.int>: > Using 3.1.4 community on CentOS 5.5. > > I'm writing a bundle to maintain the set of "server" lines in > "/etc/ntp.conf". The cleanest way seems to be for that bundle to delete > the lines and re-insert them. Almost invariably the result should be > identical (no change) and so cfengine3 will detect this and correctly > skip taking any action. > > But sometimes it fails inexplicably. It is random, intermittent; I > cannot generate it at will; it "just happens". > > The "delete_lines" gets obeyed, but the "insert_lines" seems not to > happen, so it generates an unwanted change, deleting but failing to > re-insert those lines. Ouch. (A subsequent run will then successfully > do both the delete and the insert and will restore the file to what it > had been (and to how it should have stayed as permanently). > > Since this time on Friday (three days ago) it has generated 14 unwanted > "break and later repair" incidents, even though the cfengine3 config was > completely static. > > > Any clues? > > (Note: whether or not this really is the cleanest way to do achieve this > maintenance of "ntp.conf" is a different issue, and one which would take > us back to a recent conversation about a CPAN-like collection of > commonly needed things, written in a "best practice" way. But that is a > different issue from this random, intermittent, failure. I suggest that > we stay on this failure in this thread, and not get sidetracked onto the > CPAN/best-practice question.) > > If this is a known bug, that's OK; just let me known its status, please. > > > -- > : David Lee > : ECMWF (Data Handling System) > : Shinfield Park > : Reading RG2 9AX > : Berkshire > : > : tel: +44-118-9499 362 > : email: david....@ecmwf.int > _______________________________________________ > Help-cfengine mailing list > Help-cfengine@cfengine.org > https://cfengine.org/mailman/listinfo/help-cfengine > -- SY, Seva Gluschenko. _______________________________________________ Help-cfengine mailing list Help-cfengine@cfengine.org https://cfengine.org/mailman/listinfo/help-cfengine
