Bugzilla – Bug 473308
DNS resolution does not default to using 127.0.0.1 in case of no nameserver in /etc/resolv.conf
Last modified: 2010-02-08 10:51:34 UTC
User-Agent: Mozilla/5.0 (compatible; Konqueror/4.2; Linux) KHTML/4.2.0 (like Gecko) SUSE I have configured dnsmasq to operate as a caching DNS server here using netconfig. Until the recent nscd update (nscd-2.9-2.10.1), /etc/resolv.conf included only a search statement and everything worked fine. After the update, DNS resolution requested by anything other than dig fails; appending "nameserver 127.0.0.1" to /etc/resolv.conf makes things work again normally. Reproducible: Always
I also found that attempts to change the DNS Server 'Forwarders' settings with YAST set the entries in /etc/resolv.conf instead of /etc/named.d/forwarders.conf. Attempts to change Network Settings -> Hostname/DNS->NameServer 1 modified /etc/named.d/forwarders.conf instead of /etc/resolv.conf. That is they have been incorrectly swapped over.
Oops. Indeed - I was actually not aware of the feature of using localhost by default if no nameserver is specified, and none of the machines I tested it on made use of that. Moreover, I managed to miss this bug when reviewing the patch together with both Ulrich and Jakub (this is also included in FC10, it seems). I will be more conservative about patches I include in updates again in the future. I will prepare another maintenance update soon. For now, the workaround is to insert 'nameserver 127.0.0.1' explicitly to your /etc/resolv.conf. Ad comment #1, sorry, I don't think that's related problem, this bug does not involve Yast.
*** Bug 473284 has been marked as a duplicate of this bug. ***
The SWAMPID for this issue is 22486. Please submit the patch and patchinfo file using this ID. (https://swamp.suse.de/webswamp/wf/22486)
Address: 10.10.2.79 Aliases: swamp.suse.de ;)
*** Bug 473705 has been marked as a duplicate of this bug. ***
Update released for: glibc, glibc-debuginfo, glibc-debugsource, glibc-devel, glibc-html, glibc-i18ndata, glibc-info, glibc-locale, glibc-obsolete, glibc-profile, nscd Products: openSUSE 11.1 (debug, i586, i686, ppc, ppc64, x86_64)
just ran online_update on 11.1 x86, and now i have: glibc-info-2.9-2.11.1 glibc-2.9-2.11.1 glibc-locale-2.9-2.11.1 glibc-i18ndata-2.9-2.11.1 glibc-devel-2.9-2.11.1 --------- btw, are these patches active right after install, or do i need a reboot? back in some older suse releases there was the possbility to see some "RPMDELETE" string in lsof output if im not mistaken, which displayed files and libraries which got replaced while still being used by some running processes. in recent opensuse releases (or maybe it just depends on rpm versions) i dont seem anything that would match a substring of "delete" or "rpm" any more with lsof. maybe the replacement of files works completely different by now in recent linux versions. any hints? thanks and regards.
after a restart of 11.1 x86 the system seems to work fine with no "nameserver" entries in /etc/resolv.conf so this bug is gone i suppose. postfix also delivers mails properly to external relay smtp servers, which was my original bugreport. https://bugzilla.novell.com/show_bug.cgi?id=473284 cheers.
Marking as fixed, thanks for the feedback.
It appears that the same issue exists with glibc-2.10.1-9.1 from Factory. Should I file a new bug report?
Is your nscd running?
Nscd is running. If I comment out the line "nameserver 127.0.0.1", name resolution fails.
You are right, we have the problem again - I pointed it out to upstream but that was completely ignored and I failed to realize that by version upgrade we will get this bug again. I will work on a fix, slated for next 11.2 glibc update.
*** Bug 552555 has been marked as a duplicate of this bug. ***
Committed to all relevant branches now. I will start 11.2 glibc update when the valgrind bug gets clarified.
*** Bug 558333 has been marked as a duplicate of this bug. ***
*** Bug 567341 has been marked as a duplicate of this bug. ***
Without the line "nameserver 127.0.0.1" in /etc/resolv.conf, name resolution fails. Bug is persisting.
Hello to Maintenance, I'd like a SWAMPID for this and bug 540647.
so what is the code diff? how intrusive is it? can you attach it?
Created attachment 337541 [details] patch This is the patch to be included. Fix for the other bug is rm of one file in %prep section.
rm on the optimized strncpy source? well.... i am fine with both I would guess. +1
no voices against, so lets do it.
The SWAMPID for this issue is 30444. Please submit the patch and patchinfo file using this ID. (https://swamp.suse.de/webswamp/wf/30444)
Ok, submitted patchinfo and fixed package. I'm sorry, I forgot to mention that it also includes bug 513961 fix, I hope it's ok - it's another obviously-harmless thing.
Update released for: glibc, glibc-debuginfo, glibc-debuginfo-32bit, glibc-debuginfo-x86, glibc-debugsource, glibc-devel, glibc-devel-debuginfo, glibc-html, glibc-i18ndata, glibc-info, glibc-locale, glibc-locale-debuginfo, glibc-obsolete, glibc-obsolete-debuginfo, glibc-profile, nscd, nscd-debuginfo Products: openSUSE 11.2 (debug, i586, i686, x86_64)