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

[Steve Langasek]

Ok, your 'systemctl show' output matches the default by all relevant
measures, and the only modified conffile is the expected one (your dhcpd
config).  So I'm afraid this brings us no closer to understanding why
this fails for some people and not for others.

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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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