[Bug 1543794] Re: isc-dhcp-server fails to start on second & further attempts with 'Can't open /var/lib/dhcp/dhcpd.leases for append'

[Steve Langasek]

The output in comment #8 shows that this system is running upstart
despite being 16.04.  Upstart is not supported as init on 16.04 except
during the upgrade.  This bug appears to have been fixed for the systemd
unit, but not for the upstart job.  A simple reboot to systemd should
suffice to fix the problem on 16.04.

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Title:
  isc-dhcp-server fails to start on second & further attempts with
  'Can't open /var/lib/dhcp/dhcpd.leases for append'

Status in isc-dhcp package in Ubuntu:
  Fix Released

Bug description:
  During the first start of isc-dhcp-server (using the systemd service
  unit), a blank dhcpd.leases file is created (presumably owned by
  root:root).  dhcpd starts successfully (and then exits due to no
  subnet definitions, that's expected).

  Attempting to start the service again fails with 'Can't open
  /var/lib/dhcp/dhcpd.leases for append' (the dhcpd.leases file
  ownership is now dhcpd.dhcpd), and apparmor logs a denial of the
  dac_override capability.

  Removing the leases file repeats this process (first start works as
  expected, future ones do not).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: isc-dhcp-server 4.3.3-5ubuntu4
  ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
  Uname: Linux 4.4.0-2-generic x86_64
  ApportVersion: 2.19.4-0ubuntu2
  Architecture: amd64
  Date: Tue Feb  9 20:58:12 2016
  InstallationDate: Installed on 2016-02-09 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160206)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=linux
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

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