Open Stack

On 15/04/2021 15:53, Manish Mahalwal wrote:
> Hi All,
>
> I am working with OpenStack Pike and cloud-init 21.1. I am able to 
> successfully pass dynamic vendor data to the config drive of an 
> instance. However, cloud-init 21.1 just reads all the 'x' bytes of the 
> vendor_data2.json but it doesn't execute the contents of the json. 
> Although, static vendor data works perfectly fine and the YAML file in 
> the JSON is executed as expected by cloud-init 21.1
>
> * Now, the person who wrote the code for handling dynamic vendordata 
> in cloud-init (https://github.com/canonical/cloud-init/pull/777 
> <https://github.com/canonical/cloud-init/pull/777>) says that the JSON 
> cloud-init expects is of the form:
>
>     {"cloud-init": "#cloud-config\npackage_upgrade: True\npackages:\n
>     - black\nfqdn: cloud-overridden-by-vendordata2.example.org."}
>
>

the reference implementation for the dynamic vendor data  backend was
https://github.com/mikalstill/vendordata and it was a feature developed 
specificaly for rackspace.

the data format that service should return is

# {

# "hostname": "foo",

# "image-id": "75a74383-f276-4774-8074-8c4e3ff2ca64",

# "instance-id": "2ae914e9-f5ab-44ce-b2a2-dcf8373d899d",

# "metadata": {},

# "project-id": "039d104b7a5c4631b4ba6524d0b9e981",

# "user-data": null

# }
# An example of this data:



https://github.com/mikalstill/vendordata/blob/master/app.py#L34-L42

this blog post explains how it should work
https://www.madebymikal.com/nova-vendordata-deployment-an-excessively-detailed-guide/



> * I believe that the JSON should have another outer key (as mentioned 
> here 
> https://specs.openstack.org/openstack/nova-specs/specs/newton/implemented/vendordata-reboot.html 
> <https://specs.openstack.org/openstack/nova-specs/specs/newton/implemented/vendordata-reboot.html>) 
> which is the name of the microservice specified in nova.conf file and 
> that the inner key should be cloud-init.
>
> In nova.conf:
> vendordata_dynamic_targets=name1 at http://example.com,name2 at http://example2.com 
> <http://example.com,name2@http//example2.com>
>
>     {
>         "name1": {
>      "cloud-init": "#cloud-config\n..."
>         },
>         "name2": {
>      "cloud-init": "#cloud-config\n..."
>         }
>     }
>
>
>
>
> >>Who is right and who is wrong?
>
> To read more on this please go through the following: 
> https://bugs.launchpad.net/cloud-init/+bug/1841104 
> <https://bugs.launchpad.net/cloud-init/+bug/1841104>
>