All the database operation are handled by the glance-registry that will manage the storage of the image index and properties. The glance-api is responsible for handling the API interactions and the image store. If we face any issue regarding the image service then we must go through the /var/log/glance-api.log and /var/log/glance-registry.log under the glance api controller. For better troubleshooting, perform the following actions. Download the image to check if it is readable front he store. Upload the image to check if the image is registering and writing properly to the image store. Run the openstack image list to check if the API and registry is working fine.