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

[Steve Langasek]

The /etc/apparmor.d/usr.sbin.dhcpd profile in 16.04 includes the line:

  /var/lib/dhcp/dhcpd{,6}.leases* lrw,

So there should be no issue with manipulation of the leases file.

The systemd unit in 16.04 also includes a 'chown' command to ensure the
right ownership of the leases file, so there should be no need for any
dac override.

Are you somehow running an Ubuntu 16.04 system with upstart as the init
instead of systemd?  This is what the user in
https://bugs.launchpad.net/ubuntu/+source/isc-
dhcp/+bug/1543794/comments/8 appears to have, and this is not supported.

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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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