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Ganeti quick installation guide |
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=============================== |
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Please note that a more detailed installation procedure is described in |
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the :doc:`install`. A glossary of terms can be found in the |
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:doc:`glossary`. |
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Software Requirements |
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--------------------- |
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Before installing, please verify that you have the following programs: |
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- `Xen Hypervisor <http://www.xen.org/>`_, version 3.0 or above, if |
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running on Xen |
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- `KVM Hypervisor <http://www.linux-kvm.org>`_, version 72 or above, if |
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running on KVM. In order to use advanced features, such as live |
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migration, virtio, etc, an even newer version is recommended (qemu-kvm |
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versions 0.11.X or above have shown good behavior). |
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- `DRBD <http://www.drbd.org/>`_, kernel module and userspace utils, |
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version 8.0.7 or above |
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- `LVM2 <http://sourceware.org/lvm2/>`_ |
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- `OpenSSH <http://www.openssh.com/portable.html>`_ |
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- `bridge utilities <http://www.linuxfoundation.org/en/Net:Bridge>`_ |
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- `iproute2 <http://www.linuxfoundation.org/en/Net:Iproute2>`_ |
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- `arping <http://www.skbuff.net/iputils/>`_ (part of iputils) |
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- `ndisc6 <http://www.remlab.net/ndisc6/>`_ (if using IPv6) |
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- `Python <http://www.python.org/>`_, version 2.4 or above, not 3.0 |
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- `Python OpenSSL bindings <http://pyopenssl.sourceforge.net/>`_ |
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- `simplejson Python module <http://code.google.com/p/simplejson/>`_ |
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- `pyparsing Python module <http://pyparsing.wikispaces.com/>`_, version |
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1.4.6 or above |
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- `pyinotify Python module <http://trac.dbzteam.org/pyinotify/>`_ |
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- `PycURL Python module <http://pycurl.sourceforge.net/>`_ |
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- `ctypes Python module |
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<http://starship.python.net/crew/theller/ctypes/>`_, if running on |
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python 2.4 (optional, used for node daemon memory locking) |
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- `socat <http://www.dest-unreach.org/socat/>`_, see :ref:`note |
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<socat-note>` below |
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- `Paramiko <http://www.lag.net/paramiko/>`_, if you want automated SSH |
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setup; optional otherwise but manual setup of the nodes required |
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These programs are supplied as part of most Linux distributions, so |
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usually they can be installed via the standard package manager. Also |
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many of them will already be installed on a standard machine. On |
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Debian/Ubuntu, you can use this command line to install all required |
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packages, except for DRBD and Xen:: |
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$ apt-get install lvm2 ssh bridge-utils iproute iputils-arping \ |
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ndisc6 python python-pyopenssl openssl \ |
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python-pyparsing python-simplejson \ |
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python-pyinotify python-pycurl socat |
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If you want to also enable the `htools` components, which is recommended |
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on bigger deployments (they give you automatic instance placement, |
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cluster balancing, etc.), then you need to have a Haskell compiler |
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installed. More specifically: |
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- `GHC <http://www.haskell.org/ghc/>`_ version 6.10 or higher |
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- or even better, `The Haskell Platform |
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<http://hackage.haskell.org/platform/>`_ which gives you a simple way |
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to bootstrap Haskell |
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- `json <http://hackage.haskell.org/package/json>`_, a JSON library |
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- `network <http://hackage.haskell.org/package/network>`_, a basic |
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network library |
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- `parallel <http://hackage.haskell.org/package/parallel>`_, a parallel |
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programming library (note: tested with up to version 3.x) |
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- `curl <http://hackage.haskell.org/package/curl>`_, bindings for the |
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curl library, only needed if you want these tools to connect to remote |
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clusters (as opposed to the local one) |
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All of these are also available as package in Debian/Ubuntu:: |
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$ apt-get install ghc6 libghc6-json-dev libghc6-network-dev \ |
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libghc6-parallel-dev libghc6-curl-dev |
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Note that more recent version have switched to GHC 7.x and the packages |
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were renamed:: |
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$ apt-get install ghc libghc-json-dev libghc-network-dev \ |
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libghc-parallel-dev libghc-curl-dev |
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The compilation of the htools components is automatically enabled when |
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the compiler and the requisite libraries are found. You can use the |
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``--enable-htools`` configure flag to force the selection (at which |
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point ``./configure`` will fail if it doesn't find the prerequisites). |
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If you want to build from source, please see doc/devnotes.rst for more |
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dependencies. |
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.. _socat-note: |
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.. note:: |
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Ganeti's import/export functionality uses ``socat`` with OpenSSL for |
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transferring data between nodes. By default, OpenSSL 0.9.8 and above |
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employ transparent compression of all data using zlib if supported by |
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both sides of a connection. In cases where a lot of data is |
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transferred, this can lead to an increased CPU usage. Additionally, |
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Ganeti already compresses all data using ``gzip`` where it makes sense |
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(for inter-cluster instance moves). |
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To remedey this situation, patches implementing a new ``socat`` option |
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for disabling OpenSSL compression have been contributed and will |
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likely be included in the next feature release. Until then, users or |
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distributions need to apply the patches on their own. |
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Ganeti will use the option if it's detected by the ``configure`` |
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script; auto-detection can be disabled by explicitely passing |
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``--enable-socat-compress`` (use the option to disable compression) or |
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``--disable-socat-compress`` (don't use the option). |
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The patches and more information can be found on |
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http://www.dest-unreach.org/socat/contrib/socat-opensslcompress.html. |
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Installation of the software |
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---------------------------- |
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To install, simply run the following command:: |
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./configure --localstatedir=/var --sysconfdir=/etc && \ |
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make && \ |
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make install |
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This will install the software under ``/usr/local``. You then need to |
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copy ``doc/examples/ganeti.initd`` to ``/etc/init.d/ganeti`` and |
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integrate it into your boot sequence (``chkconfig``, ``update-rc.d``, |
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etc.). |
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Cluster initialisation |
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---------------------- |
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Before initialising the cluster, on each node you need to create the |
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following directories: |
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- ``/etc/ganeti`` |
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- ``/var/lib/ganeti`` |
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- ``/var/log/ganeti`` |
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- ``/srv/ganeti`` |
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- ``/srv/ganeti/os`` |
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- ``/srv/ganeti/export`` |
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After this, use ``gnt-cluster init``. |
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.. vim: set textwidth=72 syntax=rst : |
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.. Local Variables: |
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.. mode: rst |
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.. fill-column: 72 |
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.. End: |