Since Juno, it is not possible anymore for an user to create public images nor make one of his images/snapshots public. Even though this new Glance policy is a good initiative, let’s see how we can get the old behavior back.

As an administrator, edit the file /etc/glance/policy.json and change the following line:

"publicize_image": "role:admin",

With:

"publicize_image": "",

Then restart glance:

$ sudo glance-control all restart

That’s all!