On Sun, Oct 11, 2015 at 12:39:02PM +0200, to...@tuxteam.de wrote: > On Sun, Oct 11, 2015 at 12:05:53PM +0100, Dominic Hargreaves wrote: > > [Please CC me on replies] > > > > Hi, > > > > On my freshly installed Debian jessie system, running XFCE and > > Network Manager, I'm seeing /etc/resolv.conf being blanked every so > > often (it seems to be about every 20 minutes). I can't see what is doing > > this; there's nothing in the system logs which correlates with this event. > > See my other post: the brutal (but effective) self-defense tool I used > (back then, when NM was yet allowed on my boxes ;-) was to "chattr +i" > the file. With some luck I'd find complaints in the log files which helped > clear up which program (and in which context) was trying to do something > to the files. > > The nice part of chattr is that it protects the direntry too (so the > obvious fall-back of removing and re-creating doesn't help).
But I *want* NM to update the file, and I don't have any evidence that it's NM blanking it here. So preventing updates isn't what I want. Having said that, you're right that looking for complaints could be an effective debugging tool. I'll give that a go. I did just notice that there is a third state that the file sometimes ends up in, as well as the expected one which begins "Generated by Network Manager". This is a file which just contains one nameserver entry containing the IPv6 resolver. Odd. Cheers, Dominic.