[openstack-dev] [nova] [heat] Custom Flavor creation through Heat

Steven Dake sdake at redhat.com
Tue Nov 12 18:50:55 UTC 2013

On 11/12/2013 10:25 AM, Kodam, Vijayakumar (EXT-Tata Consultancy Ser - 
FI/Espoo) wrote:
> Hi,
> In Telecom Cloud applications, the requirements for every application 
> are different. One application might need 10 CPUs, 10GB RAM and no 
> disk. Another application might need 1 CPU, 512MB RAM and 100GB Disk. 
> This varied requirements directly affects the flavors which need to be 
> created for different applications (virtual instances). Customer has 
> his own custom requirements for CPU, RAM and other hardware 
> requirements. So, based on the requests from the customers, we believe 
> that the flavor creation should be done along with the instance 
> creation, just before the instance is created. Most of the flavors 
> will be specific to that application and therefore will not be 
> suitable by other instances.
> The obvious way is to allow users to create flavors and boot 
> customized instances through Heat. As of now, users can launch 
> instances through heat along with predefined nova flavors only. We 
> have made some changes in our setup and tested it. This change allows 
> creation of customized nova flavors using heat templates. We are also 
> using extra-specs in the flavors for use in our private cloud deployment.
> This gives an option to the user to mention custom requirements for 
> the flavor in the heat template directly along with the instance 
> details. There is one problem in the nova flavor creation using heat 
> templates. Admin privileges are required to create nova flavors. There 
> should be a way to allow a normal user to create flavors.
> Your comments and suggestions are most welcome on how to handle this 
> problem !!!
> Regards,
> Vijaykumar Kodam

I have long believed that an OS::Nova::Flavor resource would make a good 
addition to Heat, but as you pointed out, this type of resource requires 
administrative priveleges.  I generally also believe it is bad policy to 
implement resources that *require* admin privs to operate, because that 
results in yet more resources that require admin.  We are currently 
solving the IAM user cases (keystone doesn't allow the creation of users 
without admin privs).

It makes sense that cloud deployers would want to control who could 
create flavors to avoid DOS attacks against their inrastructure or 
prevent trusted users from creating a wacky flavor that the physical 
infrastructure can't support.  I'm unclear if nova offers a way to 
reduce permissions required for flavor creation.  One option that may be 
possible is via the keystone trusts mechanism.

Steve Hardy did most of the work integrating Heat with the new keystone 
trusts system - perhaps he has some input.

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