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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** No longer affects: nova/ocata

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https://bugs.launchpad.net/bugs/1695861

Title:
  Invalid availability zone name with ':' is accepted

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  According to the parse_availability_zone() of the API class [1], Nova
  has a legacy hack to allow admins to specify hosts via an availability
  zone using az:host:node. That means ':' cannot be included in the name
  of an availability zone itself. However, the create aggregate API
  accepts requests which have availability zone names including ':'.
  That causes a following bad scenario:

  1. An admin creates a host aggregate with availability_zone = bad:name:example
  2. An admin tries to create a server with availability_zone = bad:name:example
  3. The nova-api parse the request and split the availability_zone value with ':'
  4. Then it recognizes az=bad, host=name, node=example
  5. Nova returns 'No valid host found' because there is no availability zone whose name is 'bad'.

  To solve this problem following fixes are needed:

  Option A:
  * Do not allow admins to create a host aggregate whose availability_zone name including ':'.
  * Document this specification.

  Option B:
  * Deprecate the legacy admin hack which uses  az:host:node and allow ':' for az name.

  [1]
  https://review.openstack.org/gitweb?p=openstack/nova.git;a=blob;f=nova/compute/api.py;h=46ed8e91fcc16f3755fd6a5e2e4a6d54f990cb8b;hb=HEAD#l561

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