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Ganeti quick installation guide
===============================
Please note that a more detailed installation procedure is described in
the :doc:`install`. A glossary of terms can be found in the
:doc:`glossary`.
Software Requirements
Before installing, please verify that you have the following programs:
- `Xen Hypervisor <http://www.xen.org/>`_, version 3.0 or above, if
running on Xen
- `KVM Hypervisor <http://www.linux-kvm.org>`_, version 72 or above, if
running on KVM. In order to use advanced features, such as live
migration, virtio, etc, an even newer version is recommended (qemu-kvm
versions 0.11.X or above have shown good behavior).
- `DRBD <http://www.drbd.org/>`_, kernel module and userspace utils,
version 8.0.7 or above
- `LVM2 <http://sourceware.org/lvm2/>`_
- `OpenSSH <http://www.openssh.com/portable.html>`_
- `bridge utilities <http://www.linuxfoundation.org/en/Net:Bridge>`_
- `iproute2 <http://www.linuxfoundation.org/en/Net:Iproute2>`_
- `arping <http://www.skbuff.net/iputils/>`_ (part of iputils)
- `ndisc6 <http://www.remlab.net/ndisc6/>`_ (if using IPv6)
- `Python <http://www.python.org/>`_, version 2.4 or above, not 3.0
- `Python OpenSSL bindings <http://pyopenssl.sourceforge.net/>`_
- `simplejson Python module <http://code.google.com/p/simplejson/>`_
- `pyparsing Python module <http://pyparsing.wikispaces.com/>`_
- `pyinotify Python module <http://trac.dbzteam.org/pyinotify/>`_
- `PycURL Python module <http://pycurl.sourceforge.net/>`_
- `ctypes Python module
<http://starship.python.net/crew/theller/ctypes/>`_, if running on
python 2.4 (optional, used for node daemon memory locking)
- `socat <http://www.dest-unreach.org/socat/>`_, see :ref:`note
<socat-note>` below
- `Paramiko <http://www.lag.net/paramiko/>`_, if you want automated SSH
setup; optional otherwise but manual setup of the nodes required
These programs are supplied as part of most Linux distributions, so
usually they can be installed via the standard package manager. Also
many of them will already be installed on a standard machine. On
Debian/Ubuntu, you can use this command line to install all required
packages, except for DRBD and Xen::
$ apt-get install lvm2 ssh bridge-utils iproute iputils-arping \
ndisc6 python python-pyopenssl openssl \
python-pyparsing python-simplejson \
python-pyinotify python-pycurl socat
If you want to build from source, please see doc/devnotes.rst for more
dependencies.
.. _socat-note:
.. note::
Ganeti's import/export functionality uses ``socat`` with OpenSSL for
transferring data between nodes. By default, OpenSSL 0.9.8 and above
employ transparent compression of all data using zlib if supported by
both sides of a connection. In cases where a lot of data is
transferred, this can lead to an increased CPU usage. Additionally,
Ganeti already compresses all data using ``gzip`` where it makes sense
(for inter-cluster instance moves).
To remedey this situation, patches implementing a new ``socat`` option
for disabling OpenSSL compression have been contributed and will
likely be included in the next feature release. Until then, users or
distributions need to apply the patches on their own.
Ganeti will use the option if it's detected by the ``configure``
script; auto-detection can be disabled by explicitely passing
``--enable-socat-compress`` (use the option to disable compression) or
``--disable-socat-compress`` (don't use the option).
The patches and more information can be found on
http://www.dest-unreach.org/socat/contrib/socat-opensslcompress.html.
Installation of the software
----------------------------
To install, simply run the following command::
./configure --localstatedir=/var --sysconfdir=/etc && \
make && \
make install
This will install the software under ``/usr/local``. You then need to
copy ``doc/examples/ganeti.initd`` to ``/etc/init.d/ganeti`` and
integrate it into your boot sequence (``chkconfig``, ``update-rc.d``,
etc.).
Before initialising the cluster, on each node you need to create the
following directories:
- ``/etc/ganeti``
- ``/var/lib/ganeti``
- ``/var/log/ganeti``
- ``/srv/ganeti``
- ``/srv/ganeti/os``
- ``/srv/ganeti/export``
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