Commit a17deeab authored by Agata Murawska's avatar Agata Murawska

Documentation update for ovfconverter

Signed-off-by: default avatarAgata Murawska <agatamurawska@google.com>
Reviewed-by: default avatarIustin Pop <iustin@google.com>
parent fa337742
......@@ -85,7 +85,7 @@ currently use OVF.
In our implementation of the OVF we allow a choice between raw, cow and
vmdk disk formats for both import and export. Other formats covertable
using ``qemu-img`` are allowed, but not tested.
using ``qemu-img`` are allowed in import mode, but not tested.
The justification is the following:
- Raw format is supported as it is the main format of disk images used
......@@ -250,8 +250,7 @@ Disks
As mentioned, Ganeti will allow export in ``raw``, ``cow`` and ``vmdk``
formats. This means i.e. that the appropriate ``ovf:format``
will be provided. It does not mean that other formats cannot be used,
rather that we did not test them.
will be provided.
As for import, we will support all formats that ``qemu-img`` can convert
to ``raw``. At this point this means ``raw``, ``cow``, ``qcow``,
``qcow2``, ``vmdk`` and ``cloop``. We do not plan for now to support
......@@ -268,7 +267,8 @@ we use ``qemu-img info``, which provides enough information for our
purposes and is better standardized.
Please note, that due to security reasons we require the disk image to
be in the same directory as the ``.ovf`` description file.
be in the same directory as the ``.ovf`` description file for both
import and export.
In order to completely ignore disk-related information in resulting
config file, please use ``--disk-template=diskless`` option.
......@@ -302,6 +302,11 @@ Support for different operating systems depends solely on their
accessibility for Ganeti instances. List of installed OSes can be
checked using ``gnt-os list`` command.
References
----------
Files listed in ``ovf:References`` section cannot be hyperlinks.
Other
-----
......@@ -425,8 +430,8 @@ Disk conversion
---------------
Disk conversion for both import and export is done using external tool
called qemu-tools. The same tool is used to determine the type of disk,
as well as its virtual size.
called ``qemu-img``. The same tool is used to determine the type of
disk, as well as its virtual size.
Import
......@@ -492,6 +497,24 @@ Typical workflow for the export is even simpler, than for the import:
- if ``--ova`` option was chosen, pack the results into ``.ova`` tarfile
Work in progress
----------------
- conversion to/from raw disk should be quicker
- add graphic card memory to export information (12 MB of memory)
- space requirements for conversion + compression + ova are currently
enormous
- add support for disks in chunks
- add support for certificates
- investigate why VMWare's ovftool does not work with ovfconverter's
compression and ova packaging -- maybe noteworty: if OVA archive does
not have a disk (i.e. in OVA package there is only .ovf ad .mf file),
then the ovftool works
- investigate why new versions of VirtualBox have problems with OVF
created by ovfconverter (everything works fine with 3.16 version, but
not with 4.0)
.. vim: set textwidth=72 :
.. Local Variables:
.. mode: rst
......
......@@ -44,14 +44,59 @@ Neither USB nor CD-ROM drive are used in Ganeti. We decided to simply
ignore unused elements of this section, so their presence won't raise
any warnings.
Operating System
----------------
List of operating systems available on a cluster is viewable using
``gnt-os list`` command. When importing from external source, providing
OS type in a command line (``--os-type=...``) is **required**. This is
because rven if the type is given in OVF description, it is not detailed
because even if the type is given in OVF description, it is not detailed
enough for Ganeti to know which os-specific scripts to use.
Please note, that instance containing disks may only be imported using
OS script that supports raw disk images.
References
----------
Files listed in ``ovf:References`` section cannot be hyperlinks.
Limitations on export
=====================
Disk content
------------
Most Ganeti instances do not contain grub. This results in some
problems when importing to virtualization software that does expect it.
Examples of such software include VirtualBox and VMWare.
To avoid trouble, please install grub inside the instance before
exporting it.
Import to VirtualBox
--------------------
``format`` option should be set to ``vmdk`` in order for instance to be
importable by VirtualBox.
Tests using existing versions of VirtualBox (3.16) suggest, that
VirtualBox does not support disk compression or OVA packaging. In future
versions this might change.
Import to VMWare
----------------
Importing Ganeti instance to VMWare was tested using ``ovftool``.
``format`` option should be set to ``vmdk`` in order for instance to be
importable by VMWare.
Presence of Ganeti section does seem to cause some problems and
therefore it is recommended to use ``--external`` option on export.
Import of compressed disks generated by ovfconverter was impossible in
current version of ``ovftool`` (2.1.0). This seems to be related to old
``vmdk`` version. Since the conversion to ``vmdk`` format is done using
``qemu-img``, it is possible and in fact expected, that future versions
of the latter tool will resolve this problem.
Import examples
......@@ -130,11 +175,34 @@ Ganeti-specific configuration to be saved. In that case, simply use the
Known issues
============
Export
------
When exporting to **VirtualBox**, you may encounter errors regarding
network. If that is the case, simply change the network type in options
to ``NAT``.
Conversion errors
-----------------
If you are encountering trouble when converting the disk, please ensure
that you have newest ``qemu-img`` version.
OVA and compression
-------------------
The compressed disks and OVA packaging do not work correctly in either
VirtualBox (old version) or VMWare.
VirtualBox (3.16 OSE) does not seem to support those two, so there is
very little we can do about this.
As for VMWare, the reason behind it not accepting compressed or packed
instances created by ovfconverter seems to be related to the old vmdk
version.
Problems on newest VirtualBox
-----------------------------
In Oracle VM Virtualbox 4.0+ there seems to be a problem when importing
any OVF instance created by ovfconverter. Reasons are again unknown,
this will be investigated.
Disk space
----------
The disk space requirements for both import and export are at the moment
very large - we require free space up to about 3-4 times the size of
disks. This will most likely be changed in future versions.
.. vim: set textwidth=72 :
......
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