Open Stack

On Thu, 2021-07-08 at 13:47 +0200, gustavo panizzo wrote:
> Hello
> 
> I'd like to reject VM creation or mutate the request depending on
> custom (business) logic
> 
> for example
> 
> - reject duplicate names within the same neutron network(s)
there is kind of a config option that will do this in nova
https://docs.openstack.org/nova/latest/configuration/config.html#DEFAULT.osapi_compute_unique_server_name_scope
you can require server nbames to be    unique at the  project or  global level.

its not per network but similar.

i assuem you are using designate or simialr to regsiter the vsm in dns extra and that is why you want them to be unique
per network. not that you can have multipel ports on the same network attached to the same vm too so you will have to be carful
not to break that if its imporatnt to your usecase.


> - change the VM name to append a number or increase it (VM-1 requested,
>    VM-1 already exists so it gets created as VM-2)

you could do this with midelware using oslo.middelware and updating nova paste.ini file to runit
here is the default requestid middelware for example 


https://github.com/openstack/oslo.middleware/blob/master/oslo_middleware/request_id.py

we have our own version of that which is enabeld here
https://github.com/openstack/nova/blob/master/etc/nova/api-paste.ini#L48-L49

> - reject some values for particular keys on metadata (role=db rejected
>    for project foo)
again this can be done with midelware in the same way

> 
> 
> How can I accomplish this? I really don't want to patch nova
you can do this without patching nova but just a word of warnign that it will likely violate any supprot agreement you may have
if you are extendign a vendor distibution of openstack

if you are deploying form souce however this is the "supported" way to do this.
supported is proably oversting things but this is what middelware is for.
> 
> thanks
> 
> PS: I found https://github.com/roaet/wafflehaus but it looks it hasn't been
> touched in years
>