Glance is an image Server that Nova can use to pickup images from. Glance is very modular and can use several types of storage backends such as filestore, s3 etc. We are installing Glance before installing Nova, so that when we get to configuring Nova, glance is ready to be used by Nova.
sudo apt-get install glance
The default config file at /etc/glance/glance.conf is good to use for a simple file store as the storage backend. Glance can be configured to use other storage backends such as swift.
Glance uses sqlite as the default database backend. While sqlite offers a quick and easy way to get started, for production use, you may consider a database such as MySQL or Postgresql.
Glance has two components - glance-api and glance-registry. These can be controlled using the concerned upstart jobs.
