[Bug 1448657] Re: isc-dhcp-server: Can't create PID file /run/dhcp-server/dhcpd.pid: Permission denied

[Jeff Reeves]

So I found a comment at https://unix.stackexchange.com/a/533900/253840

> My problem was that I had two services using same RuntimeDirectory
(isc-dhcp-server and isc-dhcp-server6), but I configured only one to
work. So when the second one died, its runtime directory got removed,
making it a problem for the first service.


Since I have only the IPv4 addresses configured as well, I decided to look into this. 

When I tested this out by changing the RuntimeDirectory to "dhcp-
server6" and the exec line's PID file parameter to "-pf /run/dhcp-
server6/dhcpd6.pid", everything worked as it should on a reboot. The PID
file was created for /run/dhcp-server/dhcpd.pid successfully.

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https://bugs.launchpad.net/bugs/1448657

Title:
  isc-dhcp-server: Can't create PID file /run/dhcp-server/dhcpd.pid:
  Permission denied

Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  Just upgraded from 14-10 to 15-04, and now see the following in
  syslog:

  Apr 26 10:50:08 server kernel: [70470.960718] audit: type=1400 audit(1430045408.725:8): apparmor="DENIED" operation="capable" profile="/usr/sbin/dhcpd" pid=8619 comm="dhcpd" capability=1  capname="dac_ove
  rride"
  Apr 26 10:50:08 server sh[8619]: Can't create PID file /run/dhcp-server/dhcpd.pid: Permission denied.

  Description:    Ubuntu 15.04
  Release:        15.04

  isc-dhcp-server:
    Installed: 4.3.1-5ubuntu2

  ----------- 8x -----------------

  # cat /etc/default/isc-dhcp-server

  # Defaults for isc-dhcp-server initscript
  # sourced by /etc/init.d/isc-dhcp-server
  # installed at /etc/default/isc-dhcp-server by the maintainer scripts

  #
  # This is a POSIX shell fragment
  #

  # Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf).
  #DHCPD_CONF=/etc/dhcp/dhcpd.conf

  # Path to dhcpd's PID file (default: /var/run/dhcpd.pid).
  #DHCPD_PID=/var/run/dhcpd.pid

  # Additional options to start dhcpd with.
  #       Don't use options -cf or -pf here; use DHCPD_CONF/ DHCPD_PID instead
  #OPTIONS=""

  # On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
  #       Separate multiple interfaces with spaces, e.g. "eth0 eth1".
  INTERFACES=""

  ----------- 8x -----------------

  # ls -la /var/run
  lrwxrwxrwx 1 root root 4 Oct 24  2013 /var/run -> /run

  # ls -la /run/dhcp-server/
  total 0
  drwxr-xr-x  2 dhcpd dhcpd   40 Apr 26 10:59 .
  drwxr-xr-x 34 root  root  1060 Apr 26 11:33 ..

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