[Bug 1110331] Re: Eliminate nscd restart from update script?

[Thomas Hood]

I have been testing nscd and it does seem to handle resolv.conf changes
automatically.

Start nscd and touch /run/resolvconf/resolv.conf:

# touch /run/resolvconf/resolv.conf
# stat /run/resolvconf/resolv.conf
  File: `/run/resolvconf/resolv.conf'
[...]
Access: 2013-01-30 21:03:43.435754739 +0100
Modify: 2013-01-30 21:03:43.435754739 +0100
Change: 2013-01-30 21:03:43.435754739 +0100

After doing some name lookup, the atime of the file has changed because
nscd has re-read it.

# stat /run/resolvconf/resolv.conf
  File: `/run/resolvconf/resolv.conf'
[...]
Access: 2013-01-30 21:03:56.547773378 +0100
Modify: 2013-01-30 21:03:43.435754739 +0100
Change: 2013-01-30 21:03:43.435754739 +0100

So I will go ahead and remove the nscd restart, at least.

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https://bugs.launchpad.net/bugs/1110331

Title:
  Eliminate nscd restart from update script?

Status in “resolvconf” package in Ubuntu:
  New

Bug description:
  Browsing the eglibc mailing list archives I notice[0] that the eglibc
  resolver has been enhanced[1] such that if /etc/resolv.conf's mtime
  changes then the client is asked to re-initialize the resolver state.
  I haven't tested the code, but if I understand the feature correctly
  it gives us an opportunity to eliminate from
  /etc/resolvconf/update.d/libc the code that restarts nscd after an
  alteration in resolv.conf. That would be a beneficial simplification.
  Ditto for some other resolvconf update scripts.

  Can we take advantage of this eglibc enhancement in order to simplify
  resolvconf update scripts?  Do we want to?

  [0]http://www.eglibc.org/archives/patches/msg00977.html
  [1]http://patch-tracker.debian.org/patch/series/view/eglibc/2.11.3-4/any/submitted-resolv.conf-thread.diff

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