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https://issues.apache.org/jira/browse/LIBCLOUD-315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Perry Zou updated LIBCLOUD-315:
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Attachment: ibm_sce.py
> simplify copying images between data centers
> ---------------------------------------------
>
> Key: LIBCLOUD-315
> URL: https://issues.apache.org/jira/browse/LIBCLOUD-315
> Project: Libcloud
> Issue Type: Improvement
> Components: Compute
> Affects Versions: 0.12.3
> Reporter: Perry Zou
> Fix For: 0.12.3
>
> Attachments: ibm_sce.py
>
>
> I am under pressure to simplify copying images between data centers so I've
> written a command-line python app to do it, had to make some updates to
> ibm_sce.py to make this work.
> Summary of changes:
> BUG: in the constants in class VolumeState, 12 should be COPYING
> ADDED: ex_get_volume_detail - because the API function to retrieve from
> /storage/<storageid> is the only way of getting a useful % completion in
> cloneStatus
> ADDED: in _to_volume, return cloneStatus in the extra content
> ADDED: ex_get_image_detail to get image info for a single image
> QUERY: one time I think I made a parameter too long - maybe the name of a
> node, not sure - and the API call failed, would be good if the libcloud
> implementation could handle this sort of thing cleanly
> My delvings into the API showed up some
> variation/inconsistencies/deficiencies between the documentation and the API
> return for JSON and XML formatsL, I raised a cloud support case on this see
> https://www.ibm.com/developerworks/mydeveloperworks/groups/service/forum/topicThread?topicUuid=d2791f71-7524-4887-9409-5085bafe3bff&communityUuid=1dba2e59-05da-4b9a-84e4-2444a6cac251&lang=en
> One thing that feels awkward using libcloud for SCE is the difference between
> libcloud calls expecting e.g. volume and image python objects, and
> lower-level things needing SCE 'ID's. I had to create a dummy class with a
> .id attribute to satisfy the need for libcloud objects when all I had to work
> with was the SCE ID.
> Also I'd like to be able to suppress that warning about not using SSL cert
> validation, it gets wearisome seeing that every time I tun my app.
> Also because my command-line app won't run continuously (because image clone
> takes so long), I used pickle/shelve to persist settings, but this wouldn't
> work for objects returned by libcloud, so I had to use copy.copy() to
> selectively retrieve the important data out of them, and only fire up the
> libcloud for the short periods I need it.
> I haven't tried with this version of ibm_sce.py, but with a previous version
> I wanted to build a single-file executable using pyinstaller and I had to add
> some specific additional imports into my .py file to ensure that pyinstaller
> brought everything needed across. Actually this feels like a libcloud problem
> rather than an ibm_sce.py problem.
> What I found is that for what I want to automate - image copying between data
> centres - there are some significant gaps the SCE API which leave no choice
> but to do manual work for each and every image copy:
> No way to retrieve the 'copy allowed' status of an image - has to be checked
> manually
> No way to change the 'copy allowed' status of an image - has to be set
> manually
> No way to share/unshare an image - has to be performed manually
> No way to check the user's quotas beforehand to see if they have ability to
> create a 60G storage - have to rely onthe API call failing
> The big one: no way to abort an operation - not a problem when everything
> works or fails relatively quickly, but clone between RTP and EHN takes a
> loooooonnngggg time, being able to abort it would definitely be useful, same
> for create volume from image, and copy volume to image.
> Overall if I had to 'vote' on libcloud I think I'd see its effectiveness as a
> unifying API definition as maybe 3 out of 10 - all the useful stuff is in the
> cloud-specific .extra[] data dict and in the ex_...() functions. However
> with ibm_sce.py beefed up to better cover the SCE API then libcloud gets
> maybe 7/10 for use as a python binding for SCE - it would get more if the
> extensions could be better integrated with the libcloud core.
> HTH
> Ian
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