[nova] Heads up on default policy change for zero-disk flavors

Matt Riedemann mriedemos at gmail.com
Thu Nov 29 00:05:51 UTC 2018

Coming back to a security bug there is a change in nova [1] in Stein to 
change the value on the "os_compute_api:servers:create:zero_disk_flavor" 
policy rule to make it admin-only by default.

This makes server create fail for non-admins users who are using flavors 
with root_gb=0 *unless* they are booting from volume.

If you already have this configuration set before upgrading to stein 
then your deployment tooling shouldn't overwrite the configured policy 
and you won't notice any changes, but if you have an empty policy file 
and upgrade and have 0 root_gb flavors, your users could see server 
create failures.

Let us know if you have any issues with this, or would like to see 
something done in the way of further documentation/communication and/or 
a nova-status upgrade check.

[1] https://review.openstack.org/#/c/603910/




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