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

[Jared Fernandez]

I'm also still seeing this on 16.04 LTS with systemd.  This is an
upgrade, not a fresh install.

Aug 26 12:30:52 Host sh[4059]: Can't open /var/lib/dhcp/dhcpd.leases for append.
Aug 26 12:30:52 Host dhcpd[4059]: Copyright 2004-2015 Internet Systems Consortium.
Aug 26 12:30:52 Host kernel: [   55.961181] audit: type=1400 audit(1472239852.640:16): apparmor="DENIED" operation="capable" profile="/usr/sbin/dhcpd" pid=4059 comm="dhcpd" capability=1  capname="dac_override"
Aug 26 12:30:52 Host dhcpd[4059]: All rights reserved.
Aug 26 12:30:52 Host dhcpd[4059]: For info, please visit https://www.isc.org/software/dhcp/
Aug 26 12:30:52 Host dhcpd[4059]: Can't open /var/lib/dhcp/dhcpd.leases for append.
Aug 26 12:30:52 Host dhcpd[4059]:
Aug 26 12:30:52 Host dhcpd[4059]: If you think you have received this message due to a bug rather
Aug 26 12:30:52 Host dhcpd[4059]: than a configuration issue please read the section on submitting
Aug 26 12:30:52 Host dhcpd[4059]: bugs on either our web page at www.isc.org or in the README file
Aug 26 12:30:52 Host dhcpd[4059]: before submitting a bug.  These pages explain the proper
Aug 26 12:30:52 Host dhcpd[4059]: process and the information we find helpful for debugging..
Aug 26 12:30:52 Host dhcpd[4059]:
Aug 26 12:30:52 Host dhcpd[4059]: exiting.
Aug 26 12:30:52 Host systemd[1]: isc-dhcp-server.service: Main process exited, code=exited, status=1/FAILURE
Aug 26 12:30:52 Host systemd[1]: isc-dhcp-server.service: Unit entered failed state.
Aug 26 12:30:52 Host systemd[1]: isc-dhcp-server.service: Failed with result 'exit-code'.

** Tags added: xenial

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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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