I would also like to add the following:

The non-recommend implementation of cobbler based maas-dhcp will always
destroy user configuration because cobbler will always generate the file
"/etc/dnsmasq.conf". When a does manual configuration for their dnsmasq
service (regardless of whether they are using Cobbler MAAS DNS/DHCP),
these changes will be lost because cobbler will always overwrite these
file. (So if someone upgrades cobbler, these changes will be lost
because cobbler will generate a new file)

This also means that cobbler does not run its own instance of dnsmasq,
but it uses the default dnsmasq service, generating a file in
"/etc/dnsmasq.conf" and consequently overwriting users changes. This is
something that we see as bad implementation.

The SRU fixes this issue because it runs its own instance of DHCP/DNS,
which doesn't change or affect any user configuration as MAAS manages
its own files/instances of the service, and does not overwrite any
manual configuration to services in /etc/.

Hope this helps

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https://bugs.launchpad.net/bugs/1109283

Title:
  [SRU] maas to Quantal and Precise

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