Code Quality Rank: L1
Programming language: C++
Tags: Cloud Computing     Cloud Management    
Latest version: v5.11.85

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OpenNebula is an open-source project delivering a simple but feature-rich and flexible solution to build and manage enterprise clouds and virtualized data centers.

Complete documentation: https://docs.opennebula.io

How to contribute: https://github.com/OpenNebula/one/wiki/How-to-Contribute-to-Development



This machine will act as the OpenNebula server and therefore needs to have installed the following software:

  • ruby >= 1.8.7
  • sqlite3 >= 3.5.2
  • xmlrpc-c >= 1.06
  • openssl >= 0.9
  • ssh
  • sqlite3-ruby gem

Additionally, to build OpenNebula from source you need:

  • Development versions of the sqlite3, xmlrpc-c and openssl packages, if your distribution does not install them with the libraries.
  • scons >= 0.97
  • g++ >= 4
  • flex >= 2.5 (optional, only needed to rebuild the parsers)
  • bison >= 2.3 (optional, only needed to rebuild the parsers)
  • libxml2-dev
  • libvncserver-dev (optional, only needed to build svncterm_server)

Ruby Libraries Requirements

A set of gem requirements are needed to make several components work. We include a handy script to install them and the requirements. It is located at share/install_gems/install_gems and you should use it to install the required gems. You have more information at:


If you want to install them manually here are the list of required rubygems:

  • OpenNebula and clients (plus cloud interfaces)

    • sqlite3
    • json
    • sequel
    • mysql
    • net-ldap
    • amazon-ec2
    • rack
    • sinatra
    • thin
    • uuidtools
    • curb
    • nokogiri
  • Sunstone server

    • json
    • rack
    • sinatra
    • thin
    • sequel
    • nokogiri

Optional Packages

These packages are not needed to run or build OpenNebula. They improve the performance of the user-land libraries and tools of OpenNebula, nor the core system. You will probably experiment a more responsive CLI.

First install rubygems and ruby development libraries

  • ruby-dev
  • rubygems
  • rake
  • make

Then install the following packages:

  • ruby xmlparser, some distributions include a binary package for this (libxml-parser-ruby1.8). If it is not available in your distribution install expat libraries with its development files and install xmlparser using gem:

    $ sudo gem install xmlparser --no-document

Note the extra parameters to gem install. Some versions of xmlparser have problems building the documentation and we can use it without documentation installed.

  • ruby ox, fast xml parsing library:

    $ sudo gem install ox --no-document


Compilation is done using scons command:

    $ scons [OPTION=VALUE]

The argument expression [OPTIONAL] is used to set non-default values for:

    sqlite_db   path-to-sqlite-install
    sqlite      no if you don't want to build sqlite support
    mysql       yes if you want to build mysql support
    xmlrpc      path-to-xmlrpc-install
    parsers     yes if you want to rebuild flex/bison files
    new_xmlrpc  yes if you have an xmlrpc-c version >= 1.31
    sunstone    yes if you want to build sunstone minified files
    systemd     yes if you want to build systemd support
    svncterm    no if you want to skip building vnc support for LXD drivers


OpenNebula can be installed in two modes: system-wide, or in self-contained directory. In either case, you do not need to run OpenNebula as root. These options can be specified when running the install script:

    $ ./install.sh install_options

where install_options can be one or more of:

-u      user that will run OpenNebula, defaults to user executing
-g      group of the user that will run OpenNebula, defaults to user
        executing install.sh
-k      keep current configuration files, useful when upgrading
-d      target installation directory. If defined, it will specified
        the path for the self-contained install. If not defined, the
        installation will be performed system wide
-c      only install client utilities: OpenNebula cli, occi and ec2
        client files
-r      remove Opennebula, only useful if -d was not specified,
        otherwise rm -rf $ONE_LOCATION would do the job
-p      do not install OpenNebula Sunstone non-minified files
-G      install only OpenNebula Gate
-f      install only OpenNebula Flow
-h      prints installer help


You can find the documentation about OpenNebula architecture, installation, configuration and references to configuration files in this documentation chapter:


The reference about the main configuration file is located here:



OpenNebula web page: https://opennebula.io

Development and issue tracking: https://github.com/OpenNebula/one/issues

Support: https://opennebula.io/support


Copyright 2002-2020, OpenNebula Project, OpenNebula Systems (formerly C12G Labs)

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

*Note that all licence references and agreements mentioned in the OpenNebula README section above are relevant to that project's source code only.