[Bug 1069570] [NEW] 1 MAC Address, two IPs - DNS is "out of sync" with DHCP leases databases, I think...

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Adam Stokes (adam-stokes):

[Impact] 
 During my new tests, I tried to create two nodes simultaneously (both via DHCP + PXE, not by clicking "+Add node") and I hit this problem:

 Same MAC Address, two different IPs:

# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.2.4

server-duid "\000\001\000\001\030\023\243\007RT\000\360\236\231";

lease 192.168.50.1 {
  starts 5 2012/10/19 06:31:21;
  ends 5 2012/10/19 18:31:21;
  cltt 5 2012/10/19 06:31:21;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 52:54:00:cd:6b:a2;
  uid "\001RT\000\315k\242";
}
lease 192.168.50.2 {
  starts 5 2012/10/19 06:31:43;
  ends 5 2012/10/19 18:31:43;
  cltt 5 2012/10/19 06:31:43;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 52:54:00:cd:6b:a2;
  client-hostname "maas-enlist";
}
lease 192.168.50.2 {
  starts 5 2012/10/19 06:31:43;
  ends 5 2012/10/19 18:31:43;
  cltt 5 2012/10/19 06:31:43;
  binding state active;
  next binding state free;
  rewind binding state free;
  hardware ethernet 52:54:00:cd:6b:a2;
  client-hostname "maas-enlist";
}
host 192.168.50.1 {
  dynamic;
  hardware ethernet 52:54:00:cd:6b:a2;
  fixed-address 192.168.50.1;
}
lease 192.168.50.1 {
  starts 5 2012/10/19 06:31:21;
  ends 5 2012/10/19 06:34:48;
  tstp 5 2012/10/19 06:34:48;
  cltt 5 2012/10/19 06:31:21;
  binding state free;
  hardware ethernet 52:54:00:cd:6b:a2;
  uid "\001RT\000\315k\242";
}

 1- DHCP gives address 192.168.50.1 to my machine on its first boot;

 2- After some time, I think that after some "reboots / elist / don'know
for sure or even after commissioning" it; the IP have changed to
192.168.50.2 and got registered at DNS (192-168-50-2.test.com) that way;

 3- In the end of the day, after allocate it to root and start using it
(the nodes), the DHCP gives again the IP 192.168.50.1 to my node, but
DNS still remains with 192.158.50.2...

 ---

 My second node, first starts with 192.168.50.3, got registered with
192.168.50.4 at DNS (and at MaaS Web GUI) but the DHCP finish with
192.168.50.3...

[Test Case]
In a virtual environment: 
- Add 2 nodes 
- PXE boot the instances
- verify dhcp leases have 1 mac address for 2 different IPs

After applying latest debdiff alter the following:

   * modify /etc/maas/dhcpd.conf to include 'ignore-client-uids true'

re-test by adding 2 additional nodes to verify the mac address is unique
between both nodes.

[Regression Potential]
Low, as it adds another optional arguement to disable checking client-uids

-- snip --

 I'll not try maas-dns again... Too many bugs...   =(

 I think that MaaS needs some kind of "glue" between DHCP and DNS to
keep it in sync.

Tks!
Thiago

** Affects: juju-core
     Importance: Undecided
         Status: New

** Affects: maas
     Importance: Critical
         Status: Triaged

** Affects: isc-dhcp (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: maas (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
1 MAC Address, two IPs - DNS is "out of sync" with DHCP leases databases, I think...
https://bugs.launchpad.net/bugs/1069570
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