[2.0] MAAS enabling DHCP against the wrong interface

[Andres Rodriguez]

I used the following commands to enable DHCP:

# add a subnet because it wasn't automatically added.
maas admin subnets create cidr=192.168.122.1/24 gateway_ip=192.168.122.1

# create an ip range whree to provide DHCP
maas admin ipranges create type=dynamic start_ip=192.168.122.10 end_ip=192.168.122.100

# add an interface to rack controller, because it wasn't automatically added.
maas admin interfaces create-physical 4y3h7n name=virbr0 mac_address=52:54:00:d3:1a:ac vlan=1

# link an interface to a subnet.
maas admin interface link-subnet 4y3h7n virbr0 mode=static ip_address=192.168.122.1 subnet=192.168.122.1/24

# enable dhcp.
- Went to the WebUI to enable DHCP in the primary rack!

This should have enabled DHCP on virbr0, unfortunately, the config file below was enabled against 'wlan0'

=============================================

virbr0 Physical 192.168.122.1 (Static assign)
virbr1 Physical (Unconfigured)
wlan0 Physical (Unconfigured)

=============================================

Feb 29 13:29:36 unleashed systemd[1]: Starting MAAS instance of ISC DHCP server for IPv4...
Feb 29 13:29:36 unleashed systemd[1]: Started MAAS instance of ISC DHCP server for IPv4.
Feb 29 13:29:36 unleashed dhcpd[26917]: WARNING: Host declarations are global. They are not limited to the scope you declared them in.
Feb 29 13:29:36 unleashed dhcpd[26917]: Wrote 0 class decls to leases file.
Feb 29 13:29:36 unleashed dhcpd[26917]: Wrote 0 deleted host decls to leases file.
Feb 29 13:29:36 unleashed dhcpd[26917]: Wrote 0 new dynamic host decls to leases file.
Feb 29 13:29:36 unleashed dhcpd[26917]: Wrote 0 leases to leases file.
Feb 29 13:29:36 unleashed systemd[1]: maas-dhcpd.service: Main process exited, code=exited, status=1/FAILURE
Feb 29 13:29:36 unleashed systemd[1]: maas-dhcpd.service: Unit entered failed state.
Feb 29 13:29:36 unleashed systemd[1]: maas-dhcpd.service: Failed with result 'exit-code'.

==========================================================================

Feb 29 13:41:56 unleashed sh[12568]: 2016-02-29 13:41:56 [-] 127.0.0.1 - - [29/Feb/2016:18:41:56 +0000] "GET /MAAS/rpc/ HTTP/1.0" 200 596 "-" "provisioningserver.rpc.clusterservice.ClusterClientService"
Feb 29 13:41:57 unleashed systemd[1]: Starting MAAS instance of ISC DHCP server for IPv4...
Feb 29 13:41:57 unleashed systemd[1]: Started MAAS instance of ISC DHCP server for IPv4.
Feb 29 13:41:57 unleashed dhcpd[9817]: Wrote 0 class decls to leases file.
Feb 29 13:41:57 unleashed dhcpd[9817]: Wrote 0 deleted host decls to leases file.
Feb 29 13:41:57 unleashed dhcpd[9817]: Wrote 0 new dynamic host decls to leases file.
Feb 29 13:41:57 unleashed dhcpd[9817]: Wrote 0 leases to leases file.
Feb 29 13:41:57 unleashed dhcpd[9817]:
Feb 29 13:41:57 unleashed dhcpd[9817]: No subnet declaration for wlan0 (192.168.1.72).
Feb 29 13:41:57 unleashed dhcpd[9817]: ** Ignoring requests on wlan0. If this is not what
Feb 29 13:41:57 unleashed dhcpd[9817]: you want, please write a subnet declaration
Feb 29 13:41:57 unleashed dhcpd[9817]: in your dhcpd.conf file for the network segment
Feb 29 13:41:57 unleashed dhcpd[9817]: to which interface wlan0 is attached. **
Feb 29 13:41:57 unleashed dhcpd[9817]:
Feb 29 13:41:57 unleashed dhcpd[9817]:
Feb 29 13:41:57 unleashed dhcpd[9817]: Not configured to listen on any interfaces!
Feb 29 13:41:57 unleashed dhcpd[9817]:
Feb 29 13:41:57 unleashed dhcpd[9817]: If you think you have received this message due to a bug rather
Feb 29 13:41:57 unleashed dhcpd[9817]: than a configuration issue please read the section on submitting
Feb 29 13:41:57 unleashed dhcpd[9817]: bugs on either our web page at www.isc.org or in the README file
Feb 29 13:41:57 unleashed dhcpd[9817]: before submitting a bug. These pages explain the proper
Feb 29 13:41:57 unleashed dhcpd[9817]: process and the information we find helpful for debugging..
Feb 29 13:41:57 unleashed dhcpd[9817]:
Feb 29 13:41:57 unleashed dhcpd[9817]: exiting.
Feb 29 13:41:57 unleashed systemd[1]: maas-dhcpd.service: Main process exited, code=exited, status=1/FAILURE
Feb 29 13:41:57 unleashed systemd[1]: maas-dhcpd.service: Unit entered failed state.
Feb 29 13:41:57 unleashed systemd[1]: maas-dhcpd.service: Failed with result 'exit-code'.

==========================================================================

# WARNING: Do not edit /var/lib/maas/dhcpd.conf yourself. MAAS will overwrite any
# changes made there.
#
# Instead, edit /etc/maas/templates/dhcp/dhcpd.conf.template and your changes
# will be present whenever MAAS rewrites the DHCP configuration. Update and save
# the cluster's configuration in MAAS to trigger an update to this file.

option arch code 93 = unsigned integer 16; # RFC4578
option path-prefix code 210 = text; #RFC5071
subnet 192.168.122.0 netmask 255.255.255.0 {
       if option arch = 00:07 {
          filename "bootx64.efi";
       } elsif option arch = 00:0C {
          filename "bootppc64.bin";
       } elsif option arch = 00:0B {
          filename "grubaa64.efi";
       } elsif option arch = 00:0E {
          filename "pxelinux.0";
          option path-prefix "b'ppc64el/'";
       } else {
          filename "pxelinux.0";
       }
       interface "wlan0";
       ignore-client-uids true;
       option subnet-mask 255.255.255.0;
       option broadcast-address 192.168.122.255;
       option domain-name-servers 192.168.1.72;
       option domain-name "maas";
       option routers 192.168.122.1;
       option ntp-servers ntp.ubuntu.com;
       class "PXE" {
          match if substring (option vendor-class-identifier, 0, 3) = "PXE";
          default-lease-time 30;
          max-lease-time 30;
       }

       pool {
          range 192.168.122.10 192.168.122.100;
       }

       on commit {
          set clhw = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
          set clip = binary-to-ascii(10, 8, ".", leased-address);
          set cllt = binary-to-ascii(10, 32, "", encode-int(lease-time, 32));
          set clht = pick-first-value(option host-name, "(none)");
          execute(
              "sudo", "maas-provision", "dhcp-notify",
              "--action", "commit", "--mac", clhw,
              "--ip-family", "ipv4", "--ip", clip,
              "--lease-time", cllt, "--hostname", clht);
       }

       on expiry {
          set clhw = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
          set clip = binary-to-ascii(10, 8, ".", leased-address);
          execute(
              "sudo", "maas-provision", "dhcp-notify",
              "--action", "expiry", "--mac", clhw,
              "--ip-family", "ipv4", "--ip", clip);
       }

       on release {
          set clhw = binary-to-ascii(16, 8, ":", substring(hardware, 1, 6));
          set clip = binary-to-ascii(10, 8, ".", leased-address);
          execute(
              "sudo", "maas-provision", "dhcp-notify",
              "--action", "release", "--mac", clhw,
              "--ip-family", "ipv4", "--ip", clip);
       }

       host unleashed-virbr0 {
          hardware ethernet 52:54:00:d3:1a:ac;
          fixed-address 192.168.122.1;
       }
}

omapi-port 7911;
key omapi_key {
    algorithm HMAC-MD5;
    secret "E3h7s8W18yUFBwhyeF6f0b8r5kO5Xwc5O/4PShFrYCAUrV2SVHN0aG4tGv1eCn+YGEjuAZHXWl/urTwKBgGbWA==";
};
omapi-key omapi_key;