On 13/11/17 22:51, Nikhil Komawar wrote:
I think it will a rather hard problem to solve. As swift store can be
configured to store objects in different configurations. I guess the
next question would be, what is your underlying problem -- multiple
build requests or is this for retry for a single download?
If the image is in image cache and you are hitting the glance node
with cached image (which is quite possible for tiny deployments), this
feature will be relatively easier.
So the specific image stored in glance is a Unified Archive
(https://docs.oracle.com/cd/E36784_01/html/E38524/gmrlo.html).
During a UAR deployment the archive UUID is required and it is contained
in the first 33 characters of the UAR image, thus a range request for
this portion is required when initiating the deployment. Then the rest
of the archive is extracted and deployed.
I just want to know whether this capability is possible with swift ?
If I change the default_store in glance_api.conf to say "file" e.g.
default_store = file. restart devstack@g-api and then upload an archive.
The curl request succeeds, so file based range requests are working,
just the default swift setup is failing and I though it might be some
conf file setting was required to enable the capability. Pretty sure
cinder works (well it used to work last time I tried this which was with
way back with Mitaka :) ).
Anyhow if it's not supported then I can work around at least initially
using file store.
thanks
Matt
On Mon, Nov 13, 2017 at 6:47 AM, Matt Keenan <[email protected]
<mailto:[email protected]>> wrote:
Hi,
Just configured devstack on Fedora 26, and by default
glance_store uses swift for image storage. When attempting to get
a specific range from a glance stored image, it's reporting range
requests are not supported e.g.:
$ curl -i -X GET -r 0-32 -H "X-Auth-Token: $auth_token"
http://10.169.104.255/image/v2/images/29b7aa
<http://10.169.104.255/image/v2/images/29b7aa>
5e-3ec2-49b5-ab6b-d6cc5099f46c/file
HTTP/1.1 400 Bad Request
Date: Mon, 13 Nov 2017 10:43:23 GMT
Server: Apache/2.4.27 (Fedora) OpenSSL/1.1.0f-fips
mod_wsgi/4.5.15 Python/2.7
Content-Length: 205
Content-Type: text/html; charset=UTF-8
x-openstack-request-id: req-5ed2239f-165b-406f-969b-5cc4ab8c632d
Connection: close
<html>
<head>
<title>400 Bad Request</title>
</head>
<body>
<h1>400 Bad Request</h1>
Getting images randomly from this store is not supported.
Offset: 0, length: 33<br /><br />
</body>
Upon investigation, glance-api log is emitting:
Nov 13 10:45:31 [email protected][22783]:
#033[01;31mERROR glance.location [#033[01;36mNone
req-ad6da3f0-ead1-486a-a873-d301f02b0888 #033[00;36mdemo
demo#033[01;31m]
#033[01;35m#033[0│·····················1;31mGlance tried all
active locations to get data for image
29b7aa5e-3ec2-49b5-ab6b-d6cc5099f46c but all have failed.#033[00m:
StoreRandomGetNotSupported: Getting images randomly from this
store is notMDg4OCAjMDMzWzAwOzM2bW supported. Offset: 0, length: 33
The exception StoreRandomGetNotSupported is emitted by
glance_store from glance_store/capabilities.py:
op_exec_map = {
'get': (exceptions.StoreRandomGetNotSupported
if kwargs.get('offset') or
kwargs.get('chunk_size') else
exceptions.StoreGetNotSupported),
'add': exceptions.StoreAddDisabled,
'delete': exceptions.StoreDeleteNotSupported}
Looking at _driver/swift/store.py I think range requests are
supported, it I've be unsuccessful in configuring it.
Does the glance_store swift driver support range requests ?
Can it be configured within a conf file, by somehow adding a
capability ?
thanks
Matt
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Thanks,
Nikhil
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