[Bug 1492212] Re: postinst should validate config before restarting bind

[Athos Ribeiro]

I unassigned it for now and set the priority to low. A patch has been
forwarded to Debian and it would be nice to have their input on this one
before creating a delta changing how the service behaves just to
(possibly) revert/change it again later.

** Changed in: bind9 (Ubuntu)
     Assignee: Athos Ribeiro (athos-ribeiro) => (unassigned)

** Changed in: bind9 (Ubuntu)
   Importance: Medium => Low

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Title:
  postinst should validate config before restarting bind

Status in bind9 package in Ubuntu:
  Triaged
Status in bind9 package in Debian:
  New

Bug description:
  We recently had a bind9 package upgrade take out DNS services for a
  production cloud because named failed to come up after the postinst
  restarted it.  So obviously, a) our DNS shouldn't be a SPOF and b) we
  shouldn't let our config files get into a state where named refuses to
  start, but, with that said, the bind9 postinst could be more robust
  against this kind of failure mode.

  Specifically it could run named-checkconf against /etc/bind/named.conf
  and, if it returns 1, either:

   a) skip the restart and scream loudly to warn the admin

  or

   b) abort the package install by erroring out of the postinst at that
  point

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