touch-packages team mailing list archive

[Zoltan Arnold Nagy <nag@xxxxxxxxxxxxxx>]

Mike, the symptom was that the PXE boot just hang as can bee seen from
the packet capture. No idea why actually, but the first thing fishy was
the wrong DHCP reply :)

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https://bugs.launchpad.net/bugs/1521618

Title:
  wrong subnet in DHCP answer when multiple networks are present

Status in MAAS:
  Triaged
Status in isc-dhcp package in Ubuntu:
  Confirmed

Bug description:
  So I have 3 interfaces with 3, non-overlapping subnets defined in my
  maas cluster controller.

  The idea would be that there is a provisioning network (10.6.0.0/16)
  to do the actual provisioning and once the node gets deployed it is
  using a different network (because the provisioning network is only
  1x1Gbit while the production network is bonded (LACP) 10Gbit).

  However, when I boot up a fresh, new node to add to MAAS, it gets the
  following DHCP reply:

  ip=10.6.239.3:10.6.250.250:9.4.113.254:255.255.255.0

  So instead of picking up the /16 subnet correctly for the 10.6.239.3
  IP, it picks up the /24 from the network where it gets it's default
  gateway from.

  Is this a bug or my understanding of how MAAS should behave when there
  are multiple networks flawed?

  Here is my /var/lib/maas/dhcpd.conf:

  subnet 9.4.113.0 netmask 255.255.255.0 {
         if option arch = 00:0E {
            filename "pxelinux.0";
            option path-prefix "ppc64el/";
         } elsif option arch = 00:07 {
            filename "bootx64.efi";
         } elsif option arch = 00:0B {
            filename "grubaa64.efi";
         } elsif option arch = 00:0C {
            filename "bootppc64.bin";
         } else {
            filename "pxelinux.0";
         }
         interface "eth0";
         ignore-client-uids true;
         option subnet-mask 255.255.255.0;
         option broadcast-address 9.4.113.255;
         option domain-name-servers 9.4.113.251;
         option domain-name "i.zc2.ibm.com";
         option routers 9.4.113.254;
         option ntp-servers ntp.ubuntu.com;
         range dynamic-bootp 9.4.113.150 9.4.113.190;
         class "PXE" {
            match if substring (option vendor-class-identifier, 0, 3) = "PXE";
            default-lease-time 30;
            max-lease-time 30;
         }
  }
  subnet 10.6.0.0 netmask 255.255.0.0 {
         if option arch = 00:0E {
            filename "pxelinux.0";
            option path-prefix "ppc64el/";
         } elsif option arch = 00:07 {
            filename "bootx64.efi";
         } elsif option arch = 00:0B {
            filename "grubaa64.efi";
         } elsif option arch = 00:0C {
            filename "bootppc64.bin";
         } else {
            filename "pxelinux.0";
         }
         interface "eth1";
         ignore-client-uids true;
         option subnet-mask 255.255.0.0;
         option broadcast-address 10.6.255.255;
         option domain-name-servers 9.4.113.251;
         option domain-name "i.zc2.ibm.com";
         option ntp-servers ntp.ubuntu.com;
         range dynamic-bootp 10.6.239.0 10.6.239.239;
         class "PXE" {
            match if substring (option vendor-class-identifier, 0, 3) = "PXE";
            default-lease-time 30;
            max-lease-time 30;
         }
  }

  Here is "subnets read":

  [
      {
          "dns_servers": [],
          "name": "9.4.113.0/24",
          "space": "space-0",
          "vlan": {
              "name": "untagged",
              "resource_uri": "/MAAS/api/1.0/vlans/0/",
              "fabric": "fabric-0",
              "vid": 0,
              "id": 0
          },
          "gateway_ip": "9.4.113.254",
          "cidr": "9.4.113.0/24",
          "id": 1,
          "resource_uri": "/MAAS/api/1.0/subnets/1/"
      },
      {
          "dns_servers": [],
          "name": "10.7.0.0/16",
          "space": "space-0",
          "vlan": {
              "name": "untagged",
              "resource_uri": "/MAAS/api/1.0/vlans/5001/",
              "fabric": "fabric-1",
              "vid": 0,
              "id": 5001
          },
          "gateway_ip": null,
          "cidr": "10.7.0.0/16",
          "id": 2,
          "resource_uri": "/MAAS/api/1.0/subnets/2/"
      },
      {
          "dns_servers": [],
          "name": "10.6.0.0/16",
          "space": "space-0",
          "vlan": {
              "name": "untagged",
              "resource_uri": "/MAAS/api/1.0/vlans/5002/",
              "fabric": "fabric-2",
              "vid": 0,
              "id": 5002
          },
          "gateway_ip": null,
          "cidr": "10.6.0.0/16",
          "id": 3,
          "resource_uri": "/MAAS/api/1.0/subnets/3/"
      }
  ]

  Running 1.9.0~rc2+bzr4509-0ubuntu1~trusty1.

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