root / docs / examplesdir / imageregister.rst @ 1b70db0d
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Image registration |
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================== |
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|
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In Synnefo, an image is loaded as a file to the storage service (Pithos+), and |
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then is registered to the image service (Plankton). The image location at the |
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storage server is unique in each a deployment and also a key for identifying |
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the image. |
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|
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The image location format at user level:: |
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|
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pithos://<user_uuid>/<container>/<object path> |
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|
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e.g., pithos://my-u53r-1d/images/debian_base3.diskdump |
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|
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In **file** and **container** contexts, users may also use the shortcut: |
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|
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/<container>/<object path> |
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|
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e.g., /images/debian_base3.diskdump |
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|
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|
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Register an image |
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----------------- |
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|
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Let the image file `debian_base3.diskdump` be a debian image located at the |
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current local directory. |
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|
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Upload the image to container `images` |
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|
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.. code-block:: console |
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|
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$ kamaki file upload debian_base3.diskdump /images |
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|
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Register the image object with the name 'Debian Base Alpha' |
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|
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.. code-block:: console |
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|
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kamaki image register --name 'Debian Base Alpha' --location=/images/debian_base3.diskdump |
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checksum: 3cb03556ec971f...e8dd6190443b560cb7 |
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container-format: bare |
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created-at: 2013-06-19 08:00:22 |
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deleted-at: |
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disk-format: diskdump |
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id: 7h1rd-1m4g3-1d |
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is-public: False |
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location: pithos://s0m3-u53r-1d/images/debian_base3.diskdump |
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name: Debian Base Alpha |
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owner: s0m3-u53r-1d |
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properties: |
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size: 903471104 |
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status: available |
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updated-at: 2013-06-19 08:01:00 |
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Metadata file uploaded as /images/debian_base3.diskdump.meta (version 1352) |
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|
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.. warning:: The image created by the above command will not be able to create |
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a working virtual server, although the registration will be successful. In |
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the synnefo universe, an image has to be registered along with some |
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`properties <http://www.synnefo.org/docs/snf-image/latest/usage.html#image-properties>`_. |
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|
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.. note:: The `image register` command automatically creates a meta file and |
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uploads it to the same location as the image. The meta file can be |
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downloaded and reused for more image registrations. |
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|
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Here is another way to perform the two operations above: **/image register** |
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with the **\- -upload-image-file** argument. This single operation will upload |
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the image file and then register it as an image, and is equivalent to |
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sequentially calling **/file upload** and **/image register**. |
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|
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In other words, the preceding and following command sequences are equivalent. |
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|
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.. code-block:: console |
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|
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kamaki image register --name='Debian Base Alpha' |
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--location=/images/debian_base3.diskdump |
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--upload-image-file=debian_base3.diskdump |
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|
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|
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Read the metafile |
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|
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.. code-block:: console |
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|
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kamaki file cat /images/debian_base3.diskdump.meta |
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{ |
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"status": "available", |
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"name": "Debian Base Gama", |
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"checksum": "3cb03556ec971f...e8dd6190443b560cb7", |
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"id": "7h1rd-1m4g3-1d2", |
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"updated-at": "2013-06-19 08:01:00", |
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"created-at": "2013-06-19 08:00:22", |
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"properties": {}, |
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"location": "pithos://s0m3-u53r-1d/images/debian_base3.diskdump", |
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"is-public": "False", |
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"owner": "s0m3-u53r-1d", |
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"disk-format": "diskdump", |
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"size": "903471104", |
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"deleted-at": "", |
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"container-format": "bare" |
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} |
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|
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Images registered by me |
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----------------------- |
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|
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List all images, then list only images owned by the user with id s0m3-u53r-1d |
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|
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.. code-block:: console |
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|
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kamaki image list |
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f1r57-1m4g3-1d Debian Base Alpha |
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container_format: bare |
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disk_format: diskdump |
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size: 474066944 |
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status: available |
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53c0nd-1m4g3-1d Beta Debian Base |
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container_format: bare |
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disk_format: diskdump |
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size: 474066944 |
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status: available |
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7h1rd-1m4g3-1d Debian Base Gama |
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container_format: bare |
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disk_format: diskdump |
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size: 474066944 |
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status: available |
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kamaki image list --owner=s0m3-u53r-1d |
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7h1rd-1m4g3-1d Debian Base Gama |
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container_format: bare |
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disk_format: diskdump |
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size: 474066944 |
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status: available |
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|
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.. note:: To get the current user id, use `kamaki user info` |
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|
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Unregister an image |
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------------------- |
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|
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An image can be unregistered by its image id, but only if the current user is |
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also the image owner. In this example, there is only one image owned by current |
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user. |
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|
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Unregister image owned by current user |
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|
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.. code-block:: console |
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|
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kamaki image unregister 7h1rd-1m4g3-1d |
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|
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Check if the image is deleted |
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|
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.. code-block:: console |
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|
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kamaki image list --owner=s0m3-u53r-1d |
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|
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Attempt to unregister an image of another user |
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|
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.. code-block:: console |
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|
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kamaki image unregister f1r57-1m4g3-1d |
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(403) FORBIDDEN forbidden () |
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|
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Register with properties |
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------------------------ |
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|
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.. warning:: A succesfully registered image will not be functional, if the |
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image properties are not defined correctly. Read the |
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`documentation <http://www.synnefo.org/docs/snf-image/latest/usage.html#image-properties>`_ |
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for more information. |
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|
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The image will be registered again, but with some custom properties:: |
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|
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OSFAMILY: linux |
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USER: someuser |
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|
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In theory, these properties can be added freely by the user, and they are not |
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required by the image server. In practice, some properties are absolutely |
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vital for an image to be useful, although not necessary for registration. |
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An attempt to register an image with custom properties: |
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|
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.. code-block:: console |
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|
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kamaki image register --name='Debian Base Gama' --location=/images/debian_base3.diskdump -p OS=linux -p user=someuser |
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Metadata file /images/debian_base3.diskdump.meta already exists |
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|
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It's true that a metafile with this name is already there, but we can override |
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it (**-f**) |
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|
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.. code-block:: console |
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|
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kamaki image register -f --name='Debian Base Gama' --location=/images/debian_base3.diskdump -p OS=linux -p user=someuser |
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|
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Register with a meta file |
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------------------------- |
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|
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Download the meta file of the image (it was uploaded recently) |
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|
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.. code-block:: console |
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|
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kamaki file download /images/debian_base3.diskdump.meta |
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Downloading /images/debian_base3.diskdump.meta --> /home/someuser/debian_base3.diskdump.meta |
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Done |
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|
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The metadata file can be edited. Let's edit the file to add these properties:: |
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|
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OS: linux |
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USER: root |
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|
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The resulting file will look like this: |
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|
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.. code-block:: javascript |
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|
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{ |
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"status": "available", |
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"name": "Debian Base Gama", |
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"checksum": "3cb03556ec971f...e8dd6190443b560cb7", |
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"id": "7h1rd-1m4g3-1d2", |
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"updated-at": "2013-06-19 08:01:00", |
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"created-at": "2013-06-19 08:00:22", |
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"properties": { |
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"OS": "linux", |
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"USER": "root" |
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}, |
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"location": "pithos://s0m3-u53r-1d/images/debian_base3.diskdump", |
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"is-public": "False", |
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"owner": "s0m3-u53r-1d", |
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"disk-format": "diskdump", |
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"size": "903471104", |
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"deleted-at": "", |
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"container-format": "bare" |
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} |
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|
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.. warning:: make sure the file is in a valid json format, otherwise image |
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register will fail |
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|
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In the following registration, the image name will change to a new one. |
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|
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Register the image (don't forget the -f parameter, to override the metafile). |
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|
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.. code-block:: console |
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|
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kamaki image register -f --name='Debian Base Delta' --location=/images/debian_base3.diskdump --metafile=debian_base3.diskdump.meta |
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checksum: 3cb03556ec971f...e8dd6190443b560cb7 |
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container-format: bare |
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created-at: 2013-06-19 08:00:22 |
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deleted-at: |
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disk-format: diskdump |
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id: 7h1rd-1m4g3-1d |
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is-public: False |
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location: pithos://s0m3-u53r-1d/images/debian_base3.diskdump |
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name: Debian Base Delta |
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owner: s0m3-u53r-1d |
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properties: |
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OS: linux |
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USER: root |
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size: 903471104 |
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status: available |
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updated-at: 2013-06-19 08:01:00 |
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Metadata file uploaded as /images/debian_base3.diskdump.meta (version 1359) |
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|
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Metadata and Property modification |
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---------------------------------- |
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|
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According to the OpenStack terminology, the terms **metadata** and |
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**properties** are two different thinks, if we talk about images. **Metadata** |
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are all kinds of named metadata on an image. Some of them are assigned by the |
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system, some others are custom and set by the users who register the image. |
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These custom **metadata** are called **properties**. |
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|
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Image **metadata** and custom **properties** can be modified even after the |
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image is registered. Metadata are fixed image attributes, like name, disk |
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format etc. while custom properties are set by the image owner and, usually, |
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refer to attributes of the images OS. |
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|
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Let's rename the image: |
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|
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.. code-block:: console |
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|
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kamaki image modify 7h1rd-1m4g3-1d --name='Changed Name' |
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|
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A look at the image metadata reveals that the name is changed: |
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|
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.. code-block:: console |
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|
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kamaki image info 7h1rd-1m4g3-1d |
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checksum: 3cb03556ec971f...e8dd6190443b560cb7 |
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container-format: bare |
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created-at: 2013-06-19 08:00:22 |
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deleted-at: |
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disk-format: diskdump |
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id: 7h1rd-1m4g3-1d |
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is-public: False |
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location: pithos://s0m3-u53r-1d/images/debian_base3.diskdump |
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name: Changed Name |
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owner: s0m3-u53r-1d |
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properties: |
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OS: linux |
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USER: root |
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size: 903471104 |
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status: available |
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updated-at: 2013-06-19 08:01:00 |
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kamaki |
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|
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We can use the same idea to change the values of other metadata like disk |
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format, container format or status. On the other hand, we cannot modify the |
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id, owner, location, checksum and dates. e.g., to make an image public or |
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private: |
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|
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.. code-block:: console |
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|
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kamaki image modify 7h1rd-1m4g3-1d --public --name='Debian Base Gama' |
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kamaki image modify 7h1rd-1m4g3-1d --private |
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|
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The first call publishes the image (set is-public to True) and also restores |
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the name to "Debian Base Gama". The second one unpublishes the image (set |
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is-public to False). |
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|
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These operations can be used for properties with the same semantics: |
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|
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.. code-block:: console |
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|
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kamaki image modify 7h1rd-1m4g3-1d -p user=user |
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kamaki image info 7h1rd-1m4g3-1d |
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... |
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properties: |
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OS: linux |
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USER: user |
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... |
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kamaki |
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|
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Just to test the feature, let's create a property "greet" with value |
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"hi there", and then remove it. Also, let's restore the value of USER: |
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|
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.. code-block:: console |
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|
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kamaki image modify 7h1rd-1m4g3-1d -p greet='Hi there' -p user=root |
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kamaki image info 7h1rd-1m4g3-1d |
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... |
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properties: |
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OS: linux |
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USER: root |
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GREET: Hi there |
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... |
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kamaki image modify 7h1rd-1m4g3-1d --property-del greet |
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kamaki image info 7h1rd-1m4g3-1d |
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... |
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properties: |
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OS: linux |
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USER: root |
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... |
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kamaki |
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|
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|
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Reregistration: priorities and overrides |
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---------------------------------------- |
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|
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Let's review the examples presented above:: |
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|
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- Register an image with name `Debian Base Gama` |
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- Unregister the image |
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- Register a new image of the uploaded image object, with custom properties |
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- Reregister the image with a meta file and modified properties and name |
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|
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**The image id is related to the image object** |
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|
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Although the image was unregistered and reregistered, the image id, that is |
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produced automatically at the server side, was the same. This is due to the |
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fact that image ids are 1 to 1 related to image objects uploaded to Pithos+ |
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|
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**An explicit image name overrides the metafile** |
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|
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Each image needs a name and this is given as the first argument of the |
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`register` command. This name overrides the name in the metafile. |
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|
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**Reregistration is not an update, but an override** |
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|
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The property `user: root` won over `user: someuser`, because it was set last. |
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Actually, all properties were replaced by the new ones, when the image was |
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reregistered, and the same holds with all customizable attributes of the image. |
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|
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Command line wins the metafile |
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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|
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Let's compine the metafile with a command line attribute `user: admin` |
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|
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.. code-block:: console |
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|
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kamaki image register -f --name='Debian Base Delta' --location=/images/debian_base3.diskdump --metafile=debian_base3.diskdump.meta |
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checksum: 3cb03556ec971f...e8dd6190443b560cb7 |
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container-format: bare |
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created-at: 2013-06-19 08:00:22 |
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deleted-at: |
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disk-format: diskdump |
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id: 7h1rd-1m4g3-1d |
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is-public: False |
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location: pithos://s0me-u53r/images/s0m3-u53r-1d/images/debian_base3.diskdump |
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name: Debian Base Delta |
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owner: s0m3-u53r-1d |
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properties: |
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OS: linux |
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USER: root |
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size: 903471104 |
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status: available |
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updated-at: 2013-06-19 08:01:00 |
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Metadata file uploaded as /images/debian_base3.diskdump.meta (version 1377) |
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kamaki |
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|
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Although the property `OS` was read from the metafile, the property `USER` was |
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set by the command line property to `admin`. |
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|
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.. note:: This feature allows the use of a metafile as a template for uploading |
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multiple images with many common attributes but slight modifications per |
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image |
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|
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Multiple metafile versions |
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-------------------------- |
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|
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.. warning:: Make sure your container is set to auto, otherwise, there will be |
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no object versions |
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|
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.. code-block:: console |
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|
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kamaki container info images | grep versioning |
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x-container-policy-versioning: auto |
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|
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To set versioning to auto |
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|
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.. code-block:: console |
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|
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kamaki container modify images --versioning=auto |
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|
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In the above examples, the image was registered many times by overriding the |
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metafile. It is possible to avoid writing a metafile, as well as accessing |
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older versions of the file. |
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|
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Register the image without uploading a metafile |
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|
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.. code-block:: console |
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|
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kamaki image register --name='Debian Base Delta' --location=/images/debian_base3.diskdump --metafile=debian_base3.diskdump.meta --no-metafile-upload |
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checksum: 3cb03556ec971f...e8dd6190443b560cb7 |
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container-format: bare |
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created-at: 2013-06-19 08:00:22 |
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deleted-at: |
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disk-format: diskdump |
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id: 7h1rd-1m4g3-1d |
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is-public: False |
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location: pithos://s0m3-u53r/images/s0m3-u53r-1d/images/debian_base3.diskdump |
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name: Debian Base Delta |
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owner: s0m3-u53r-1d |
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properties: |
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OS: linux |
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USER: root |
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size: 903471104 |
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status: available |
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updated-at: 2013-06-19 08:01:00 |
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kamaki |
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|
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Uploaded metafiles are kept in versions, thanks to Pithos+ versioning support |
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|
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.. code-block:: console |
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|
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kamaki file info /images/debian_base3.diskdump.meta --object-versions |
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1352 |
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created: 19-06-2013 11:00:22 |
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1359 |
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created: 19-06-2013 11:01:00 |
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1377 |
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created: 19-06-2013 11:34:37 |
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kamaki |
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|
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Consult the first version of the metafile |
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|
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.. code-block:: console |
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|
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kamaki file cat --object-version=1352 /images/debian_base3.diskdump.meta |
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{ |
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"status": "available", |
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"name": "Debian Base Gama", |
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"checksum": "3cb03556ec971f...e8dd6190443b560cb7", |
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"id": "7h1rd-1m4g3-1d2", |
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"updated-at": "2013-06-19 08:01:00", |
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"created-at": "2013-06-19 08:00:22", |
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"properties": {}, |
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"location": "pithos://s0m3-u53r/images/s0m3-u53r-1d/images/debian_base3.diskdump", |
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"is-public": "False", |
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"owner": "s0m3-u53r-1d", |
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"disk-format": "diskdump", |
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"size": "903471104", |
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"deleted-at": "", |
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"container-format": "bare" |
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} |
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|
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Download the second version |
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|
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.. code-block:: console |
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|
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kamaki file download --object-version=1359 /images/debian_base3.diskdump.meta debian_base3.diskdump.meta.v1359 |
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Downloading /images/debian_base3.diskdump.meta --> /home/someuser/debian_base3.diskdump.meta.v1359 |
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Done |
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|
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Batch image upload |
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------------------ |
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|
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Let a directory at /home/someuser/images with a variety of images needed to be |
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uploaded and registered. |
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|
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Batch-upload the images |
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|
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.. code-block:: console |
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|
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kamaki file upload -r images /images |
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mkdir /images/images |
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Uploading /home/someuser/images/debian.diskdump --> /images/images/debian.diskdump |
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Uploading /home/someuser/images/win8.diskdump --> /images/images/win8.diskdump |
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... |
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Done |
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|
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Make sure the images are uploaded to /images/images/ remote directory object |
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|
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.. code-block:: console |
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|
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kamaki file list /images/images/ |
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D images/ |
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983MB images/debian.diskdump |
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2.2GB images/win8.diskdump |
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... |
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kamaki |
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|
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Use the host shell capabilities to streamline the registration, so exit kamaki |
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|
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.. code-block:: console |
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|
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kamaki /exit |