[Openstack-operators] Small openstack (part 2), distributed glance

matt matt at nycresistor.com
Mon Jan 19 03:11:54 UTC 2015


On Sun, Jan 18, 2015 at 10:05 PM, Jay Pipes <jaypipes at gmail.com> wrote:

> On 01/15/2015 05:20 PM, George Shuklin wrote:
>> Hello everyone.
>> One more thing in the light of small openstack.
>> I really dislike tripple network load caused by current glance snapshot
>> operations. When compute do snapshot, it playing with files locally,
>> than it sends them to glance-api, and (if glance API is linked to
>> swift), glance sends them to swift. Basically, for each 100Gb disk there
>> is 300Gb on network operations. It is specially painful for glance-api,
>> which need to get more CPU and network bandwidth than we want to spend
>> on it.
>> So idea: put glance-api on each compute node without cache.
>> To help compute to go to the proper glance, endpoint points to fqdn, and
>> on each compute that fqdn is pointing to localhost (where glance-api is
>> live). Plus normal glance-api on API/controller node to serve
>> dashboard/api clients.
>> I didn't test it yet.
>> Any ideas on possible problems/bottlenecks? And how many glance-registry
>> I need for this?
> Honestly, the Glance project just needs to go away, IMO.
> The glance_store library should be the focus of all new image and volume
> bit-moving functionality, and the glance_store library should replace all
> current code in Nova and Cinder that does any copying through the Glance
> API nodes.
> The Glance REST API should just be an artifact repository that the
> glance_store library (should be renamed to oslo.bitmover or something)
> should call the Glance REST API for the URIs of image locations (source and
> targets) and handle all the bit moving operations in as efficient a manner
> as possible.
> Best,
> -jay
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