Ganeti quick installation guide

Please note that a more detailed installation procedure is described in the Ganeti installation tutorial. A glossary of terms can be found in the Glossary.

Software Requirements

Before installing, please verify that you have the following programs:

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 RBD, 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 \
                  python-elementtree qemu

On Fedora to install all required packages except RBD, DRBD and Xen:

$ yum install openssh openssh-clients bridge-utils iproute ndisc6 \
              pyOpenSSL pyparsing python-simplejson python-inotify \
              python-lxml python-paramiko socat qemu-img

If you want to build from source, please see doc/devnotes.rst for more dependencies.


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 explicitly 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

Haskell requirements

If you want to enable the htools component, which is recommended on bigger deployments (this give you automatic instance placement, cluster balancing, etc.), then you need to have a Haskell compiler installed on your build machine (but this is not required on the machines which are just going to run Ganeti). More specifically:

  • GHC version 6.12 or higher
  • or even better, The Haskell Platform which gives you a simple way to bootstrap Haskell
  • json, a JSON library
  • network, a basic network library
  • parallel, a parallel programming library (note: tested with up to version 3.x)
  • curl, bindings for the curl library, only needed if you want these tools to connect to remote clusters (as opposed to the local one)

All of these are also available as package in Debian/Ubuntu:

$ apt-get install ghc6 libghc6-json-dev libghc6-network-dev \
                  libghc6-parallel-dev libghc6-curl-dev

Or in Fedora running:

$ yum install ghc ghc-json-devel ghc-network-devel ghc-parallel-devel

The most recent Fedora doesn’t provide ghc-curl. So this needs to be installed using cabal or alternatively htools can be build without curl support.

Note that more recent version have switched to GHC 7.x and the packages were renamed:

$ apt-get install ghc libghc-json-dev libghc-network-dev \
                  libghc-parallel-dev libghc-curl-dev

If using a distribution which does not provide them, the first install the Haskell platform and then install the additional libraries via cabal:

$ cabal install json network parallel curl

The compilation of the htools components is automatically enabled when the compiler and the requisite libraries are found. You can use the --enable-htools configure flag to force the selection (at which point ./configure will fail if it doesn’t find the prerequisites).

In Ganeti version 2.6, one of the daemons (ganeti-confd) is shipped in two versions: the Python default version (which has no extra dependencies), and an experimental Haskell version. This latter version can be enabled via the ./configure flag --enable-confd=haskell and a few has extra dependencies:

  • hslogger, version 1.1 and above (note that Debian Squeeze only has version 1.0.9)
  • Crypto, tested with version 4.2.4
  • text
  • bytestring, which usually comes with the compiler
  • hinotify

These libraries are available in Debian Wheezy (but not in Squeeze), so you can use either apt:

$ apt-get install libghc-hslogger-dev libghc-crypto-dev libghc-text-dev \

or cabal:

$ cabal install hslogger Crypto text hinotify

to install them.

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.).

Cluster initialisation

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

After this, use gnt-cluster init.