[Bug 1186662] Re: isc-dhcp-server fails to renew lease file

[Emsi]

For the record:
The proper fix for me was to make sure that /etc/apparmor.d/usr.sbin.dhcpd included
  capability chown,
along:
  capability net_bind_service,
  capability net_raw,
  capability setgid,
  capability setuid,

For some reason it was not there after upgrade.

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https://bugs.launchpad.net/bugs/1186662

Title:
  isc-dhcp-server fails to renew lease file

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Trusty:
  Triaged

Bug description:
  After raring upgrade, the dhcp server fails to renew lease file when
  it tries to (about every hour).

  The syslog says:
  dhcpd: Can't create new lease file: Permission denied

  It looks like a permission problem, because

  # chown -R dhcpd:dhcpd /var/lib/dhcp

  the above command temporarily solves the issue, until dhcpd is
  restarted: at that time, the ownership of the directory and the lease
  file is set back to root:root.

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