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Linux VM Contextualization
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OpenNebula Linux VM Contextualization


This addon provides contextualization packages for the Linux (and, other Unix-like) guest virtual machines running in the OpenNebula cloud. Based on the provided contextualization parameters, the packages prepare the networking in the running guest virt. machine, configure SSH keys, set passwords, run custom start scripts, and many others.


Latest versions can be downloaded from the release page. Check the supported OpenNebula versions for each release.


Documentation on packages installation and guest contextualization can be found in the latest stable OpenNebula Operation Guide. For beta releases, refer to the latest development documentation.

Tested platforms

List of tested platforms only:

Platform Versions
Amazon Linux 2
CentOS 6, 7
Red Hat Enterprise Linux 7
Fedora 28, 29, 30
openSUSE 42.3, 15
SUSE Linux Enterprise Server 12 SP3
Debian 8, 9, 10
Devuan 1, 2
Ubuntu 14.04, 16.04, 18.04, 18.10
Alpine Linux 3.6, 3.7, 3.8
FreeBSD 11.2, 12.0

(the packages might work on other versions or flavours, but those aren't tested)

Build own package

Packages for each release for supported guests are available in the release page. Also, any version can be built by the scripts provided in this repository.


  • Linux host
  • Ruby >= 1.9
  • gem fpm >= 1.10.0
  • dpkg utils for deb package creation
  • rpm utils for rpm package creation


The script is able to create all package types and can be configured to include more files in the package or change some of its parameters. Package type and content are configured by the env. variable TARGET, the corresponding target must be defined in Target describes the package format, name, dependencies, and files. Files are selected by the tags. Set of required tags is defined for the target (in, each file has a list of corresponding tags right in its filename (divided by the regular name by 2 hashes ##, dot-separated).

Package name or version can be overridden by env. variables NAME and VERSION.


$ TARGET=deb ./
$ TARGET=el7 NAME=my-one-context ./
$ TARGET=alpine ./
$ TARGET=freebsd VERSION=5.7.85 ./

NOTE: The generator must be executed from the same directory it resides.

Check for general package metadata and for the list of targets and their metadata. Most of the parameters can be overriden by the appropriate environment variable.


To contribute bug patches or new features, you can use the github Pull Request model. It is assumed that code and documentation are contributed under the Apache License 2.0.

More info:

Repository structure

All code is located under src/ and structure follows the installation directory structure. Files for different environments/targets are picked by the tag, tags are part of the filename separated from the installation name by 2 hashes (##). Tags are dot-separated.


  • script - non-tagged file for all targets
  • script##systemd - file tagged with systemd
  • script##systemd.rpm - file tagged with systemd and rpm

Contextualization scripts

Contextualization scripts, which are executed on every boot and during the reconfiguration, are located in src/etc/one-context.d/. Scripts are divided into following 2 parts:

  • local - pre-networking, prefixed with loc-
  • post-networking, prefixed with net-

All other scripts, which are not prefixed with loc- or net-, are executed as a first during the post-networking contextualization stage.


Copyright 2002-2019, 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

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.

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