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

[Ian McMichael]

Rather annoyingly, this still seems to be present in 14.04 LTS after all
these years!  The following seems to fix it (at least until the isc-
dhcp-server package gets updated):

- Stop the DHCP server (service isc-dhcp-server stop)
- chown -R dhcpd:dhcpd /var/lib/dhcp
- Edit /etc/init/isc-dhcp-server.conf and remove (or comment out) the following section from near the end:

    # The leases files need to be root:root even when dropping privileges
    [ -e /var/lib/dhcp/dhcpd.leases ] || touch /var/lib/dhcp/dhcpd.leases
    chown root:root /var/lib/dhcp /var/lib/dhcp/dhcpd.leases
    if [ -e /var/lib/dhcp/dhcpd.leases~ ]; then
        chown root:root /var/lib/dhcp/dhcpd.leases~
    fi

- Edit /etc/apparmor.d/local/usr.sbin.dhcpd and add:

# Allow lease file updates
capability dac_override,

- Reload AppArmor profiles (service apparmor reload)
- Restart DHCPd (service isc-dhcp-server start)

Hopefully everything will work now.  Why can these changes not be made
in the official package?

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to isc-dhcp in Ubuntu.
https://bugs.launchpad.net/bugs/1186662

Title:
  isc-dhcp-server fails to renew lease file

Status in “isc-dhcp” package in Ubuntu:
  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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1186662/+subscriptions