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---
features:
- Pass proxy information from agent driver to IPA ramdisk, so that images
can be cached on the proxy server.
issues:
- When using caching proxy with ``agent_*`` drivers, caching the image on the
proxy server might involve increasing [glance]swift_temp_url_duration
config option value. This way, the cached entry will be valid for a period
of time long enough to see the benefits of caching. Large temporary URL
duration might become a security issue in some cases.
upgrade:
- Adds a [glance]swift_temp_url_cache_enabled configuration option to enable
Swift temporary URL caching. It is only useful if the caching proxy is
used. Also adds [glance]swift_temp_url_expected_download_start_delay, which
is used to check if the Swift temporary URL duration is long enough to let
the image download to start, and, if temporary URL caching is enabled, to
determine if a cached entry will be still valid when download starts. The
value of [glance]swift_temp_url_expected_download_start_delay must be less
than the value for the [glance]swift_temp_url_duration configuration
option.
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