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

[Jeff Reeves]

I'm encountering the same thing on a fresh installation of Ubuntu 20.04.

Here is what happens right after a reboot:
jeff at bridges:~$ ll /run/ | grep dhcp
jeff at bridges:~$ sudo systemctl status isc-dhcp-server
[sudo] password for jeff:
● isc-dhcp-server.service - ISC DHCP IPv4 server
     Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2020-04-28 23:59:43 MST; 11s ago
       Docs: man:dhcpd(8)
   Main PID: 1374 (dhcpd)
      Tasks: 4 (limit: 19047)
     Memory: 6.9M
     CGroup: /system.slice/isc-dhcp-server.service
             └─1374 dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf

Apr 28 23:59:44 bridges dhcpd[1374]:
Apr 28 23:59:44 bridges dhcpd[1374]: Listening on LPF/enp2s0/2c:60:0c:c6:a4:be/192.168.1.0/24
Apr 28 23:59:44 bridges sh[1374]: Listening on LPF/enp2s0/2c:60:0c:c6:a4:be/192.168.1.0/24
Apr 28 23:59:44 bridges sh[1374]: Sending on   LPF/enp2s0/2c:60:0c:c6:a4:be/192.168.1.0/24
Apr 28 23:59:44 bridges sh[1374]: Sending on   Socket/fallback/fallback-net
Apr 28 23:59:44 bridges sh[1374]: Can't create PID file /run/dhcp-server/dhcpd.pid: No such file or directory.
Apr 28 23:59:44 bridges dhcpd[1374]: Sending on   LPF/enp2s0/2c:60:0c:c6:a4:be/192.168.1.0/24
Apr 28 23:59:44 bridges dhcpd[1374]: Sending on   Socket/fallback/fallback-net
Apr 28 23:59:44 bridges dhcpd[1374]: Can't create PID file /run/dhcp-server/dhcpd.pid: No such file or directory.
Apr 28 23:59:44 bridges dhcpd[1374]: Server starting service.
jeff at bridges:~$ sudo systemctl restart isc-dhcp-server
jeff at bridges:~$ ll /run/ | grep dhcp
drwxr-xr-x  2 root                root                  60 Apr 29 00:00 dhcp-server/
jeff at bridges:~$ ll /run/dhcp-server/
total 4
drwxr-xr-x  2 root root   60 Apr 29 00:00 ./
drwxr-xr-x 39 root root 1140 Apr 29 00:00 ../
-rw-r--r--  1 root root    5 Apr 29 00:00 dhcpd.pid


I can hardcode the PID file names like Nicorac above mentions, but I'd rather things just work out of the box without needing to apply random workarounds like that.

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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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