openstack team mailing list archive

[Eoghan Glynn <eglynn@xxxxxxxxxx>]

Florian,

The key point in the split between glance-api.conf, glance-registry.conf,
glance-cache.conf etc. is the glance application intended to consume that
config.

This follows directly from the naming:

 bin/glance-api by default consumes glance-api.conf
 bin/glance-registry by default consumes glance-registry.conf
 bin/glance-cache-* by default consumes glance-cache.conf
 bin/glance-scrubber by default consumes glance-scrubber.conf

This is merely a convention, which can be overridden for example by 
naming the glance API service config as foobar.conf:

 bin/glance-api --config-file /path/to/foobar.conf

However the naming convention is convenient as it may allow the pathname
of the config file to be inferred if not explicitly specified, for example
for the glance-api application, the follow search order is used:

      ~/.glance/glance-api.conf
      ~/glance-api.conf
      /etc/glance/glance-api.conf
      /etc/glance-api.conf

or, in general, replace glance-api above with the program name, i.e.
basename(sys.argv[0]) 

The intended consumer then determines what options should be specified in
each config file, for example there would be no point in defining the 
the backend s3/swift store config in glance-cache.conf, similarly no
need to define the max cache size in glance-api.conf, nor the scrubber
wakeup time in glance-registry.conf.

Then each .conf file has a corresponding -paste.ini, which splits along
a different axis. Here the idea is to separate the core and paste deploy
config for a particular glance application. So for example the default 
paste config for glance-api is glance-api-paste.ini, to be found in the
same directory as glance-api.conf. Again this is merely a convenient
convention that may be overridden. 

Does that all make sense?

Cheers,
Eoghan

> Can someone help me understand what options need to be in
> "glance-api.conf" and what options can be left to
> "glance-cache.conf" , resp "glance-cache-paste.ini" ?
>
> Case in point: If I wanted to use the "xattr" driver, I need to
> specify that in "glance-api.conf" -- specifying that in
> "glance-cache.conf" is ignored. The trivial solution is to copy the
> options from "glance-cache.conf" and paste them in "glance-api.conf"
> but I hardly think this was the intention of having the two split.
> 
> So I'd like to understand when & how those two files are loaded /
> parsed.
> 
> The questions above is for the image cache, but I guess the same type
> of questions can be asked for the scrubber (i.e.
> glance-scrubber.conf" resp "glance-scrubber-paste.ini")
> 
> Least I forget: This is for the E4 code release.
> 
> TIA for the help,
> 
> Florian
> 
> 
> 
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