Bug 442172
| Summary: | Call res_init() on NetworkManager reconfiguration | ||||||
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| Product: | [Fedora] Fedora | Reporter: | Jan Kratochvil <jan.kratochvil> | ||||
| Component: | glibc | Assignee: | Jakub Jelinek <jakub> | ||||
| Status: | CLOSED RAWHIDE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||
| Severity: | low | Docs Contact: | |||||
| Priority: | low | ||||||
| Version: | 9 | CC: | dcbw, drepper | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | All | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | 2.8.90-11 | Doc Type: | Bug Fix | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2008-08-08 21:18:41 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 442171 | ||||||
| Attachments: |
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Description
Jan Kratochvil
2008-04-12 12:23:17 UTC
Created attachment 302209 [details]
Testcase not seeing changed `/etc/resolv.conf'.
I think the preferred upstream solution proposed by the glibc maintainers is to use nscd. NM already does: /etc/init.d/nscd condrestart /usr/sbin/nscd -i hosts whenever it updates resolv.conf. In such case NetworkManager should rpm-Require the package nscd and it should start the nscd daemon along. In Bug 442171 was shown the practical case of a minimal Fedora installation where nscd is missing and in such case "it just does not work". It would be best if NetworkManager would be able to call res_init() in all the running applications using libresolv without nscd but neither Jakub nor me knows a safe+cheap method of such notification (shmat(2) of a flag-page?). NM isn't going to require nscd because it's not a hard dep and not everyone wants to run it. People that care need to start nscd if they want it. Having NM call res_init() in each process seems like a gross hack though; if that's the lengths NM has to go to, then the call should be in glibc itself... Dan, glibc should call res_init() itself but it needs to know when to do so. Any kernel call (such as stat() or time()) is not acceptable for the maintainers. Going to try to provide a `rdtsc'-protected stat() call if it will be feasible. Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping Could you please reply to the previous question? If you won't reply in one month, I will have to close this bug as INSUFFICIENT_DATA. Thank you. The current rawhide nscd version automatically will discover when /etc/resolv.conf is changed and it invalidates the database. It is necessary to have check-files passwd yes in /etc/nscd.conf. I'ts of course check-files hosts yes Ulrich, this Bug is whole about a configuration without nscd installed. If nscd is required for the proper functionality of glibc nscd should be Required by the rpm packaging. It is currently not the case. (As I still did not provide a patch the Bug should remain CLOSED, though.) (In reply to comment #10) > this Bug is whole about a configuration without nscd installed. If nscd is > required for the proper functionality of glibc nscd should be Required by the > rpm packaging. nscd is required to make changes work. Period. I won't add code into the stub resolver to check the file every time. This is far too slow. We have a perfectly fine solution, so use it. I've been arguing to change the default to use nscd by default for a long time. In fact, we should completely remove the option to not use nscd. |