On the Origins of IP Ranges in MAAS

[Christian Robottom Reis]

On Wed, Jun 28, 2017 at 02:22:15PM -0700, Mike Pontillo wrote:
>    If you're confused about how IP ranges work in MAAS, I've got the blog
> post for you. ;-) I've written about history of IP ranges in MAAS, which
> should help put our current feature set into context. You can find the post
> here:
> 
> http://spectrum42.com/posts/ip-ranges-in-maas/

Thanks for sharing this, as we really need this sort of content. I had
also noted something to bring up that the post touches on, and I only
now managed to do that.

When turning Managed Allocation off in MAAS 2.2, the inversion of
meaning for Reserved IP range is really dangerous UI. Think of this
scenario (which we hit at a customer site):

    - Set up Reserved IP ranges to exclude switches, routers, etc.
    - Deploy a few machines
    - Hit an odd bug that prompts some investigation
    - Toggle Managed Allocation as part of that investigation

Boom. Reserved IPs are given out and we knock out customer
infrastructure.

I'm adding Ante and Nobuto who I believe ran into this.
-- 
Christian Robottom Reis             [+1] 612 888 4935 | [+55] 16 99112 6430
VP Field Engineering                      http://launchpad.net/~kiko