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

[Raphaël Badin]

Actually, I think you're seeing two distinct problems here:

- The first one is that the default hostname picked up during enlistment
is IP-based and thus it assumes that the IP lease will stay the same.
If the lease changes, this change is not reflected in the DNS config
because this is resolved by a fixed A record in the config file (and not
a CNAME record which is only written when the node has a non-ip-based
hostname) A workaround is to actually rename your node to something not
IP-based.

- The other problem (dhcpd: Can't create new lease file: Permission
denied) is something I've never seen and needs investigation.  I don't
think that changing the permissions of /var/lib/maas/dhcp will solve the
problem.  The DHCP server that MAAS manages is setup exactly the same
way that the default dhcp is setup (the one which has its lease files in
/var/lib/dhcp).  The fact that you're seeing this problem only once
leads me to think that this happens when the DHCP server rewrites the
dhcp lease file.

Here is a extract from the DHCP server documentation:
"""
The lease file is rewritten occasionally to prevent excessive file growth. A temporary file is created containing the current lease file, the last file is renamed with a ~ suffix (e.g. /var/lib/dhcpd/dhcpd.leases~), then the temporary file is renamed to the configured lease file name.
"""
I suspect that the temporary file is written in /var/lib/dhcpd/ and that something prevents that file from being written.  Maybe the current apparmor profile is too restrictive (http://paste.ubuntu.com/1297105/).  Thiago, do you see apparmor-related errors in the logs around the time the dhcp error pops up?

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https://bugs.launchpad.net/bugs/1069570

Title:
  1 MAC Address, two IPs - DNS is "out of sync" with DHCP leases
  databases, I think...

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