Building an image
Now that we've looked at getting a disk image into Glance, let's investigate how a cloud image is built. A cloud image is just a sealed disk image with cloud-init included. A sealed disk image is a file that has an operating system installed in it and has had all the host-specific items removed from it. Cloud-init is a post-boot process that checks the metadata service of OpenStack and asks for post-boot commands that should be run on the launched instance. We'll see cloud-init's use cases in Chapter 5, Instance Management, and Chapter 9, Orchestration; for now, we'll just make sure it's included in the cloud image we build. To build the image, we'll use virt-install. There are quite a few other options. If you're familiar with ...
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