[OpenStack Glance]: Failed to contact the endpoint at https://localhost:9292 for discovery.

After the successful installation of OpenStack Glance, connecting to the Glance API (on port 9292) fails with an error message “failed to contact the endpoint at https://controller.tg.com:9292 for discovery. Fallback to using that endpoint as the base url“. Below is the complete error message:

Failed to contact the endpoint at https://controller.tg.com:9292 for discovery. Fallback to using that endpoint as the base url. 
Failed to contact the endpoint at https://controller.tg.com:9292 for discovery. Fallback to using that endpoint as the base url. 
The image service for : exists but does not have any supported versions.

# net-state -ntlp
tcp        0      0 0.0.0.0:9292          0.0.0.0:*               LISTEN      292411/python3

Solution: The problem is that glance is configured to listen on all interfaces and is not only bound to the loopback interface.

Make the glance-api service listen on the loopback interface (127.0.0.1). Expressly, bind_host must be appropriately set.

Step 1: Open the file /etc/glance/glance-api.conf

# vim /etc/glance/glance-api.conf

Step 2: Search for the below line

bind_host = 0.0.0.0

Step 3: Replace with

bind_host = 127.0.0.1

Step 4: Restart the glance service

# systemctl restart openstack-glance-api

Step 5: Now the service should listen on the loopback IP as below:

# net-state -ntlp
tcp        0      0 127.0.0.1:9292          0.0.0.0:*               LISTEN      292411/python3