That's fair enough. There might be a further use case where the user wants to understand how this flag will impact them on a resize? Not sure if we check it on resize, but it might make sense to check it in future.
Thinking about it a little more, I'm not sure how the general case would work. I'll definitely look into the protected properties, but it may be a little while before I can look at that myself. One thing to note is that it looks like auto_disk_config is XenAPI specific, so we can add it to xenstore without much problem. Bob ________________________________ From: Richard Goodwin [richard.good...@rackspace.com] Sent: 18 June 2013 18:42 To: OpenStack Development Mailing List Subject: Re: [openstack-dev] Discussion around blueprint https://blueprints.launchpad.net/nova/+spec/add-disk-config-to-xenstore Bob, If the user is cognizant of the extension, they may want to do post-build activities based on the value. I think that's the use for this particular case. As for exposing them in a more general fashion, I agree with both of your points: there can be use to expose them, and also reasons to keep certain ones private. So, I think that whatever method we used would need to allow for that. Glance is solving for exposing image metadata ("protected properties"), but I don't believe anything equivalent exists for this case. Richard Goodwin Product Manager – Cloud Servers & Cloud Images Ideation | Intellection | Activator | Relator | Responsibility Phone: (512) 788 5403 – Cell: (512) 736-7897 (Austin) Skype: rtgoodwin<file:///callto/::rtgoodwin> - Yahoo: richardtgoodwin<file:///ymsgr/sendim%3Frichardtgoodwin> AIM: dellovision - IRC: goody / rgoodwin From: Bob Ball <bob.b...@citrix.com<mailto:bob.b...@citrix.com>> Reply-To: OpenStack Development Mailing List <openstack-dev@lists.openstack.org<mailto:openstack-dev@lists.openstack.org>> Date: Tuesday, June 18, 2013 10:25 AM To: OpenStack Development Mailing List <openstack-dev@lists.openstack.org<mailto:openstack-dev@lists.openstack.org>> Subject: Re: [openstack-dev] Discussion around blueprint https://blueprints.launchpad.net/nova/+spec/add-disk-config-to-xenstore I don’t have any objections to this being exposed – but the question was should we expose it, and I don’t see any benefit to the user for this particular key. Of course, as you say, a provider may want to expose many specific metadata keys. Perhaps we should look at how to do this generically rather than special-casing the disk-config key? I suspect it would not be desirable to expose _all_ metadata keys to the guest? I’m not sure what metadata we have at the moment, but I can certainly imagine adding some metadata that would be best to stay private in the future. Bob From: Richard Goodwin [mailto:richard.good...@rackspace.com] Sent: 18 June 2013 15:25 To: OpenStack Development Mailing List Subject: Re: [openstack-dev] Discussion around blueprint https://blueprints.launchpad.net/nova/+spec/add-disk-config-to-xenstore Bob, They could do extra deduction/guessing work to infer that, but it's a valid piece of metadata from the base image, so I'm concerned why there's so much discussion about exposing it? Seems like a provider could have a reason for exposing any number of metadata bits in the Store for their implementation needs. In addition, it assumes that any scenario where there is some unpartitioned space, the intent is to partition it; but the real desire is to determine that based on the image metadata (or API parameter). Pardon me not having a lot of history on this process in the past. Richard Goodwin Product Manager – Cloud Servers & Cloud Images Ideation | Intellection | Activator | Relator | Responsibility Phone: (512) 788 5403 – Cell: (512) 736-7897 (Austin) Skype: rtgoodwin<file:///\\callto\::rtgoodwin> - Yahoo: richardtgoodwin<file:///\\ymsgr\sendim%3Frichardtgoodwin> AIM: dellovision - IRC: goody / rgoodwin From: Bob Ball <bob.b...@citrix.com<mailto:bob.b...@citrix.com>> Reply-To: OpenStack Development Mailing List <openstack-dev@lists.openstack.org<mailto:openstack-dev@lists.openstack.org>> Date: Tuesday, June 18, 2013 4:31 AM To: OpenStack Development Mailing List <openstack-dev@lists.openstack.org<mailto:openstack-dev@lists.openstack.org>> Subject: Re: [openstack-dev] Discussion around blueprint https://blueprints.launchpad.net/nova/+spec/add-disk-config-to-xenstore I’m not sure I understand why the user might want to access the disk_config value from within the guest? This seems to be something they could infer from the partition structure – i.e. if the whole drive is partitioned then disk_config was AUTO when the instance was created. Bob From: Navneet Kumar [mailto:navne...@thoughtworks.com] Sent: 18 June 2013 04:52 To: openstack-dev@lists.openstack.org<mailto:openstack-dev@lists.openstack.org> Subject: [openstack-dev] Discussion around blueprint https://blueprints.launchpad.net/nova/+spec/add-disk-config-to-xenstore Hi, disk_config has been introduced by the extension 'DiskConfig'( [[http://docs.rackspace.com/openstack-extensions/compute/rax-dcf/content/rax-dcf.pdf]] ) .This extension exposes api to set and retrieve the disk_config values ( either 'MANUAL" or "AUTO' ) .As a user one wants to access the value of disk_config from inside of instance but currently there is no way to get the value of disk_config from inside of instance. To get any metadata/userdata of the instance a config drive ( [[http://docs.openstack.org/trunk/openstack-compute/admin/content/config-drive.html]] ) can be attached to the instance during boot-up.So disk_drive information can also be included in the config drive. Should we include this value in the config drive and xen store as well ? -- ----------------------------- Navneet Kumar Application Developer Thoughtworks India Mob: +91 9686577076
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