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This patch will allow properly configured Glance servers to return a temporary URL for an object hosted on Swift. It will require Glance to use Swift as its backend. A temporary URL allow a deploy driver to download an image from Glance without requiring an auth_token, which gives access more than just Glance. This requires a set of config options: the Glance endpoint URL, a shared secret temporary key, and the account configured in Glance to talk to Swift with, which owns the container images are stored in. A later patch will explore using the direct_url in Glance to simplify the config options. We/I need to add a note in the docs about Swift being a possible dependency for Ironic deploys using IPA, along with how to set the Temp URL key. Swift performance concerns will be addressed in this blueprint: https://blueprints.launchpad.net/ironic/+spec/improve-swift-agent-downloads SecurityImpact DocImpact Partial Implements: blueprint swift-temp-urls Change-Id: I10e4784eee63e8edc9ba30a9c5004a08aa3a6d8e