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

[Juri Haberland]

Yes, it seems to fix it, but there is a upgrade-problem:

...
Mar  1 21:52:16 server kernel: [177627.390088] init: isc-dhcp-server main process (1218) killed by TERM signal
Mar  1 21:52:20 server dhcpd: Internet Systems Consortium DHCP Server 4.2.4
Mar  1 21:52:20 server dhcpd: Copyright 2004-2012 Internet Systems Consortium.
Mar  1 21:52:20 server dhcpd: All rights reserved.
Mar  1 21:52:20 server dhcpd: For info, please visit https://www.isc.org/software/dhcp/
Mar  1 21:52:20 server dhcpd: Internet Systems Consortium DHCP Server 4.2.4
Mar  1 21:52:20 server dhcpd: Copyright 2004-2012 Internet Systems Consortium.
Mar  1 21:52:20 server dhcpd: All rights reserved.
Mar  1 21:52:20 server dhcpd: For info, please visit https://www.isc.org/software/dhcp/
Mar  1 21:52:20 server kernel: [177631.988612] type=1400 audit(1456865540.867:34): apparmor="DENIED" operation="capable" profile="/usr/sbin/dhcpd" pid=6043 comm="dhcpd" capability=0  capname="chown"
Mar  1 21:52:20 server dhcpd: Can't chown new lease file: Operation not permitted
Mar  1 21:52:20 server kernel: [177631.989335] init: isc-dhcp-server main process (6043) terminated with status 1
Mar  1 21:52:20 server kernel: [177631.989343] init: isc-dhcp-server main process ended, respawning
...

and so on, until:
Mar  1 21:52:21 server kernel: [177632.161456] init: isc-dhcp-server respawning too fast, stopped
Mar  1 21:52:21 server kernel: [177632.248030] type=1400 audit(1456865541.127:38): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/dhcpd" pid=6122 comm="apparmor_parser"
Mar  1 21:52:22 server kernel: [177633.172803] type=1400 audit(1456865542.055:39): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/sbin/dhclient" pid=6186 comm="apparmor_parser"
Mar  1 21:52:22 server kernel: [177633.172970] type=1400 audit(1456865542.055:40): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=6186 comm="apparmor_parser"
Mar  1 21:52:22 server kernel: [177633.173109] type=1400 audit(1456865542.055:41): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=6186 comm="apparmor_parser"

>From now on "service isc-dhcp-server start" starts the DHCP server and
all seems well. I have currently no idea what's going wrong.

This happend on two servers running Trusty.

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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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