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

[Launchpad Bug Tracker]

This bug was fixed in the package isc-dhcp - 4.3.3-5ubuntu9

---------------
isc-dhcp (4.3.3-5ubuntu9) xenial; urgency=medium

  * debian/isc-dhcp-server.isc-dhcp-server{,6}.service: adjust permissions
    for most recent PARANOIA commits to avoid granting 'capability
    dac_override' in the AppArmor profile on second and subsequent starts
    (LP: #1543794):
    - /var/lib/dhcp is root:dhcpd and 775
    - /var/lib/dhcp/dhcpd{,6}.leases is root:dhcpd and 664
    - don't chown /run/dhcp-server to dhcpd:dhcpd since the pid file is now
      created as root:root and the pid file was not being created before. If
      this needs to be reintroduced in the future, use root:dhcpd and 775,
      like with the leases file.

 -- Jamie Strandboge <jamie at ubuntu.com>  Tue, 01 Mar 2016 08:19:43 -0600

** Changed in: isc-dhcp (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1543794

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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