> 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
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