> Yes, it does make perfect sense. Kind thanks for the explanation. > > However, what is still unclear is what config iteems that pertain to > other apps must still be present (ie. duplicated in) glance-api.conf > (e.g. image_cache_driver , etc )
This is probably something we should document more carefully so it's clear to users from the outset which config options are required and when. However I don't have a definitive mapping of config items to apps, so I'd normally consider them on a case-by-case basis and just check where the config option is used. For example it may be always required by a particular app, or only be required if a particular middleware is enabled. In this particular case, a little grep'ing in the codebase soon reveals when the image_cache_driver config item is required. $ find glance -name "*.py" | grep -v test | xargs grep -n -B 5 image_cache_driver glance/image_cache/__init__.py-33-class ImageCache(object): glance/image_cache/__init__.py-34- glance/image_cache/__init__.py-35- """Provides an LRU cache for image data.""" glance/image_cache/__init__.py-36- glance/image_cache/__init__.py-37- opts = [ glance/image_cache/__init__.py:38: cfg.StrOpt('image_cache_driver', default='sqlite'), -- glance/image_cache/__init__.py-48- glance/image_cache/__init__.py-49- def init_driver(self): glance/image_cache/__init__.py-50- """ glance/image_cache/__init__.py-51- Create the driver for the cache glance/image_cache/__init__.py-52- """ glance/image_cache/__init__.py:53: driver_name = self.conf.image_cache_driver So we see that this config option is pulled in by the glance.image_cache.ImageCache class, which is then used as follows: $ find glance -name "*.py" | grep -v test | xargs grep ImageCache | cut -f1 -d: | sort | uniq glance/api/cached_images.py glance/api/middleware/cache.py glance/image_cache/cleaner.py glance/image_cache/__init__.py glance/image_cache/prefetcher.py glance/image_cache/pruner.py glance/image_cache/queue_image.py Looking the first two source files, we see that the image_cache_driver config option would be required in the glance-api application iff a caching or cachemanagement-based pipeline is selected. Cheers, Eoghan _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp