maas hooks/triggers for dns (de-)registration

[Patrizio Bassi]

Hi All,

I'm on maas 2.1.3 using it for a juju openstack deploy.

I have an external dns providing name resolution for bare metal machines
and everything works fine.
Basically we have a subnet 10.10.xxx.xxx/16 allocated where first addresses
are statically registered in the dns server, while the others are
"assigned" (meaning, without any hostname association) to maas so it can
dynamically use them.

I could not deploy the openstack-telemetry charm because
Mar 13 08:13:41 juju-45a437-0-lxd-0 aodh-api[20910]: Traceback (most recent
call last):
Mar 13 08:13:41 juju-45a437-0-lxd-0 aodh-api[20910]:   File
"/usr/bin/aodh-api", line 14, in <module>
Mar 13 08:13:41 juju-45a437-0-lxd-0 aodh-api[20910]:     my_ip =
socket.gethostbyname(socket.gethostname())
Mar 13 08:13:41 juju-45a437-0-lxd-0 aodh-api[20910]: socket.gaierror:
[Errno -2] Name or service not known

infact the LXD containers allocated by juju don't have a dns entry. Beside
the need to fix the juju charm somehow it spots a problem: how to register
a container ip/hostname in a upstream dns.

It looks something similar to https://lists.ubuntu.com/
archives/maas-devel/2017-February/002381.html

Question is: can maas trigger a custom script (actually a remote rest api
curl) when a machine or a container is created (event of new dns entry) and
when it gets destroyed (so we can unregister the hostname?).

I was looking at DHCP Snippets but i'm not sure it's the most proper way
(actually should be a bind trigger).

Patrizio
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