Creating image from a running instance

Sometimes we want to spawn off a few new instances, with the same spec and operating systems, but we do not want to go through the hassle of setting up each OS manually, and then update it one by one. In order to do that efficiently, openstack provides a very good way, which is to create an image from a running instance, and this image can be used to spawn off new instances afterwards.

Before we turn any instance to an image, we need to know its instance ID

$ openstack server list

We can then create an image from the above instance ID

$ openstack server image create --name centos7-updated-20180525 21e78f23-8b67-423a-9622-d46c8487f829

To make sure our image is created correctly, check using:

$ openstack image list

To create a new instance from the image, please refer here