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

[Steve Langasek]

eproust, since yours was a fresh install the cause of your problem is
unlikely to be the same.  But you may want to install the debsums
package and check whether any of the files on your system differ from
the ones in the package:

$ sudo apt install debsums
$ debsums -e isc-dhcp-server

You may also want to check that your systemd unit is the expected one,
by running the following command and attaching the resulting file:

systemctl show isc-dhcp-server > isc-dhcp-server-systemctl.txt

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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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