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.. _plankton:
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Image Registry Service
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^^^^^^^^^^^^^^^^^^^^^^
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Introduction
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============
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The Image Registry Service is a part of Cyclades. It is implemented as a very
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thin layer on top of Pithos; every Image on the Image Service is a file on
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Pithos, with special metadata which are stored on Cyclades. At the frontend,
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Cyclades implement the OpenStack Glance API; at the backend it queries an
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existing Pithos backend. In the current implementation the service runs the
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Image Service and Pithos on a single, unified backend: users may synchronize
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their Images, using the Pithos clients, then register them with Cyclades, with
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zero data movement. Then spawn new VMs from those Images with Cyclades.
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Let's see below:
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.. image:: images/synnefo-clonepath.png
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The figure shows a sailor bundling his physical machine with the
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``snf-image-creator`` tool, uploading the file to Pithos, registering the file
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as a new Image, and then spawning two new VMs with Cyclades from this Image.
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The :ref:`Image API <plankton-api-guide>` is implemented inside Cyclades, so
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please consult the :ref:`Cyclades Documentation <cyclades>` for more details.