maas hooks/triggers for dns (de-)registration

[Andres Rodriguez]

Hi Patrizio,

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.
>

Does this mean that your machines in MAAS share the same hostname as those
in your upstream DNS server? Are you configuring MAAS DNS to point to the
upstream DNS (Under the Settings page). This would allow MAAS to use your
upstream DNS server to resolve for domains names MAAS doesn't know about.


> 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.
>

What version of Juju are you using? Juju should be registering the
container in MAAS, and requesting an static IP address, that will trigger
the creation of a DNS entry and a hostmap.

>
> It looks something similar to https://lists.ubuntu.com/archi
> ves/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).
>

MAAS can't trigger a custom script when a machine/container is created,
however, you can use DHCP snippets to include configuration to trigger a
script when a new hostmap / lease is created. That said, although
discouraged, you could also potentially use DHCP snippets to do DDNS.

>
> Patrizio
>
>
>
>
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>


-- 
Andres Rodriguez
Engineering Manager, MAAS
Canonical USA, Inc.
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