"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "doc/source/install/refarch/common.rst" between
ironic-17.0.2.tar.gz and ironic-17.0.3.tar.gz

About: OpenStack Ironic (Optional Service: Bare-Metal Provisioning) aims to provision bare metal machines instead of virtual machines, forked from the Nova baremetal driver.
The "Wallaby" series (latest release).

common.rst  (ironic-17.0.2):common.rst  (ironic-17.0.3)
skipping to change at line 315 skipping to change at line 315
Disk space Disk space
^^^^^^^^^^ ^^^^^^^^^^
Each conductor needs enough free disk space to cache images it uses. Each conductor needs enough free disk space to cache images it uses.
Depending on the combination of the deploy interface and the boot option, Depending on the combination of the deploy interface and the boot option,
the space requirements are different: the space requirements are different:
* The deployment kernel and ramdisk are always cached during the deployment. * The deployment kernel and ramdisk are always cached during the deployment.
* The ``iscsi`` deploy method requires caching of the whole instance image * When ``[agent]image_download_source`` is set to ``http`` and Glance is used,
locally during the deployment. The image has to be converted to the raw the conductor will download instances images locally to serve them from its
format, which may increase the required amount of disk space, as well as HTTP server. Use ``swift`` to publish images using temporary URLs and convert
the CPU load. them on the node's side.
When ``[agent]image_download_source`` is set to ``local``, it will happen
even for HTTP(s) URLs. For standalone case use ``http`` to avoid unnecessary
caching of images.
In both cases a cached image is converted to raw if ``force_raw_images``
is ``True`` (the default).
.. note:: .. note::
This is not a concern for the ``direct`` deploy interface, as in this case ``image_download_source`` can also be provided in the node's
the deployment ramdisk downloads the image and either streams it to the ``driver_info`` or ``instance_info``. See :ref:`image_download_source`.
disk or caches it in memory.
* The ``iscsi`` deploy method always requires caching of the whole instance
image locally during the deployment. The image has to be converted to the raw
format, which may increase the required amount of disk space, as well as the
CPU load.
* When network boot is used, the instance image kernel and ramdisk are cached * When network boot is used, the instance image kernel and ramdisk are cached
locally while the instance is active. locally while the instance is active.
.. note:: .. note::
All images may be stored for some time after they are no longer needed. All images may be stored for some time after they are no longer needed.
This is done to speed up simultaneous deployments of many similar images. This is done to speed up simultaneous deployments of many similar images.
The caching can be configured via the ``image_cache_size`` and The caching can be configured via the ``image_cache_size`` and
``image_cache_ttl`` configuration options in the ``pxe`` group. ``image_cache_ttl`` configuration options in the ``pxe`` group.
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