Hi@akhtar,
You have to first download one preinstalled image in your system. You can go through the below-given link.
https://fedoraproject.org/server/download
Now you have to log in to your OpenStack cloud and run the below command. It will automatically create an image in OpenStack.
$ source keystonerc_demo
[root@openstack ~(keystone_demo)]#  glance image-create --file Fedora-Cloud-Base-32-1.6.x86_64.qcow2 --disk-format qcow2 --container-format bare --name fed64
+------------------+--------------------------------------+
| Property         | Value                                |
+------------------+--------------------------------------+
| checksum         | 9ba41708fdc7d21a829e3836242f56d6     |
| container_format | bare                                 |
| created_at       | 2020-07-06T07:29:57Z                 |
| disk_format      | qcow2                                |
| id               | 5c40dedf-57eb-4e68-9ee7-1bb7ffcb105a |
| min_disk         | 0                                    |
| min_ram          | 0                                    |
| name             | fed64                                |
| owner            | c75cffdeb390468fa099948aa43a99b2     |
| protected        | False                                |
| size             | 302841856                            |
| status           | active                               |
| tags             | []                                   |
| updated_at       | 2020-07-06T07:30:00Z                 |
| virtual_size     | None                                 |
| visibility       | shared                               |
+------------------+--------------------------------------+
I hope this will help you.