Sunstone Installation & Configuration


You must have an OpenNebula site properly configured and running to use OpenNebula Sunstone, be sure to check the OpenNebula Installation and Configuration Guides to set up your private cloud first. This section also assumes that you are familiar with the configuration and use of OpenNebula.

OpenNebula Sunstone was installed during the OpenNebula installation. If you followed the installation guide then you already have all ruby gem requirements. Otherwise, run the install_gem script as root:

/usr/share/one/install_gems sunstone

The Sunstone Operation Center offers the possibility of starting a VNC/SPICE session to a Virtual Machine. This is done by using a VNC/SPICE websocket-based client (noVNC) on the client side and a VNC proxy translating and redirecting the connections on the server-side.


The SPICE Web client is a prototype and is limited in function. More information of this component can be found in the following link


Make sure that there is free space in sunstone’s log directory or it will die silently. By default the log directory is /var/log/one.


  • Websockets-enabled browser (optional): Firefox and Chrome support websockets. In some versions of Firefox manual activation is required. If websockets are not enabled, flash emulation will be used.
  • Installing the python-numpy package is recommended for a better vnc performance.



The Sunstone configuration file can be found at /etc/one/sunstone-server.conf. It uses YAML syntax to define some options:

Available options are:

Option Description
:tmpdir Uploaded images will be temporally stored in this folder before being copied to OpenNebula
:one_xmlrpc OpenNebula daemon host and port
:one_xmlrpc_timeout Configure the timeout (seconds) for XMLRPC calls from sunstone. See Shell Environment variables
:host IP address on which the server will listen on. by default.
:port Port on which the server will listen. 9869 by default.
:sessions Method of keeping user sessions. It can be memory or memcache. For server that spawn more than one process (like Passenger or Unicorn) memcache should be used
:memcache_host Host where memcached server resides
:memcache_port Port of memcached server
:memcache_namespace memcache namespace where to store sessions. Useful when memcached server is used by more services
:debug_level Log debug level: 0 = ERROR, 1 = WARNING, 2 = INFO, 3 = DEBUG
:env Execution environment for Sunstone. dev, Instead of pulling the minified js all the files will be pulled (app/main.js). Check the Building from Source guide in the docs, for details on how to run Sunstone in development. prod, the minified js will be used (dist/main.js)
:max_upload_file_size Maximum allowed size of uploaded images (in bytes). Leave commented for unlimited size
:auth Authentication driver for incoming requests. Possible values are sunstone, opennebula, remote and x509. Check authentication methods for more info
:core_auth Authentication driver to communicate with OpenNebula core. Possible values are x509 or cipher. Check cloud_auth for more information
:encode_user_password For external authentication drivers, such as LDAP. Performs a URL encoding on the credentials sent to OpenNebula, e.g. secret%20password. This only works with “opennebula” auth.
:lang Default language for the Sunstone interface. This is the default language that will be used if user has not defined a variable LANG with a different valid value its user template
:vnc_proxy_port Base port for the VNC proxy. The proxy will run on this port as long as Sunstone server does. 29876 by default. Could be prefixed with an address on which the sever will be listening (ex:
:vnc_proxy_support_wss yes, no, only. If enabled, the proxy will be set up with a certificate and a key to use secure websockets. If set to only the proxy will only accept encrypted connections, otherwise it will accept both encrypted or unencrypted ones.
:vnc_proxy_cert Full path to certificate file for wss connections.
:vnc_proxy_key Full path to key file. Not necessary if key is included in certificate.
:vnc_proxy_ipv6 Enable ipv6 for novnc. (true or false)
:vnc_client_port Port where the vnc JS client will connect. If not set, will use the port section of :vnc_proxy_port
:vnc_request_password Request VNC password for external windows, by default it will not be requested (true or false)
:table_order Default table order, resources get ordered by ID in asc or desc order.
:marketplace_username Username credential to connect to the Marketplace.
:marketplace_password Password to connect to the Marketplace.
:marketplace_url Endpoint to connect to the Marketplace. If commented, a 503 service unavailable error will be returned to clients.
:oneflow_server Endpoint to connect to the OneFlow server.
:routes List of files containing custom routes to be loaded. Check server plugins for more info.
:mode Default views directory.
:keep_me_logged True to display ‘Keep me logged in’ option in Sunstone login.
:get_extended_vm_info True to display IP in table by requesting the extended vm pool to oned


To use Sunstone with IPv6 only systems and thin HTTP sever, use the full IPv6 address in the field :host. If you need to set the localhost address (::1) or the unspecified address (::) please use the following:

Example: :host: 0::1, :host: 0::0


To use Sunstone with IPv6 only systems and thin HTTP sever, use the full IPv6 address in the field :host. If you need to set the localhost address (::1) or the unspecified address (::) please use the following:

Example: :host: 0::1, :host: 0::0

Starting Sunstone

To start Sunstone just issue the following command as oneadmin

service opennebula-sunstone start

You can find the Sunstone server log file in /var/log/one/sunstone.log. Errors are logged in /var/log/one/sunstone.error.

Commercial Support Integration

We are aware that in production environments, access to professional, efficient support is a must, and this is why we have introduced an integrated tab in Sunstone to access OpenNebula Systems (the company behind OpenNebula, formerly C12G) professional support. In this way, support ticket management can be performed through Sunstone, avoiding disruption of work and enhancing productivity.


This tab and can be disabled in each one of the view yaml files.

    #- support-tab


Cannot connect to OneFlow server

The Service instances and templates tabs may show the following message:

Cannot connect to OneFlow server


You need to start the OneFlow component following this section, or disable the Service and Service Templates menu entries in the Sunstone views yaml files.

VNC Troubleshooting

When clicking the VNC icon, the process of starting a session begins:

  • A request is made and if a VNC session is possible, Sunstone server will add the VM Host to the list of allowed vnc session targets and create a random token associated to it.
  • The server responds with the session token, then a noVNC dialog pops up.
  • The VNC console embedded in this dialog will try to connect to the proxy either using websockets (default) or emulating them using Flash. Only connections providing the right token will be successful. The token expires and cannot be reused.

There can be multiple reasons that may prevent noVNC from correctly connecting to the machines. Here’s a checklist of common problems:

  • noVNC requires Python >= 2.5 for the websockets proxy to work. You may also need additional modules as python2<version>-numpy.
  • You can retrieve useful information from /var/log/one/novnc.log
  • You must have a GRAPHICS section in the VM template enabling VNC, as stated in the documentation. Make sure the attribute IP is set correctly ( to allow connections from everywhere), otherwise, no connections will be allowed from the outside.
  • Your browser must support websockets, and have them enabled. This is the default in current Chrome and Firefox, but former versions of Firefox (i.e. 3.5) required manual activation. Otherwise Flash emulation will be used.
  • Make sure there are not firewalls blocking the connections. The proxy will redirect the websocket data from the VNC proxy port to the VNC port stated in the template of the VM. The value of the proxy port is defined in sunstone-server.conf.
  • Make sure that you can connect directly from Sunstone frontend to the VM using a normal VNC client tools such as vncviewer.
  • When using secure websockets, make sure that your certificate and key (if not included in certificate) are correctly set in Sunstone configuration files. Note that your certificate must be valid and trusted for the wss connection to work. If you are working with a certicificate that it is not accepted by the browser, you can manually add it to the browser trust-list visiting https://sunstone.server.address:vnc_proxy_port. The browser will warn that the certificate is not secure and prompt you to manually trust it.
  • If your connection is very, very, very slow, there might be a token expiration issue. Please try the manual proxy launch as described below to check it.
  • Doesn’t work yet? Try launching Sunstone, killing the websockify proxy and relaunching the proxy manually in a console window with the command that is logged at the beginning of /var/log/one/novnc.log. You must generate a lock file containing the PID of the python process in /var/lock/one/.novnc.lock Leave it running and click on the VNC icon on Sunstone for the same VM again. You should see some output from the proxy in the console and hopefully the cause of why the connection does not work.
  • Please contact the support forum only when you have gone through the suggestion above and provide full sunstone logs, shown errors and any relevant information of your infrastructure (if there are Firewalls etc)
  • The message “SecurityError: The operation is insecure.” is usually related to a Same-Origin-Policy problem. If you have Sunstone TLS secured and try to connect to an insecure websocket for VNC, Firefox blocks that. For Firefox, you need to have both connections secured to not get this error. And don’t use a self-signed certificate for the server, this would raise the error again (you can setup your own little CA, that works, but don’t use a self-signed server certificate). The other option would be to go into the Firefox config (about:config) and set “network.websocket.allowInsecureFromHTTPS” to “true”.

Tuning & Extending

Internationalization and Languages

Sunstone supports multiple languages. If you want to contribute a new language, make corrections or complete a translation, you can visit our:

Translating through Transifex is easy and quick. All translations should be submitted via Transifex.

Users can update or contribute translations anytime. Prior to every release, normally after the beta release, a call for translations will be made in the forum. Then the source strings will be updated in Transifex so all the translations can be updated to the latest OpenNebula version. Translation with an acceptable level of completeness will be added to the final OpenNebula release.

Customize the VM Logos

The VM Templates have an image logo to identify the guest OS. To modify the list of available logos, or to add new ones, edit /etc/one/sunstone-logos.yaml.

- { 'name': "Arch Linux",         'path': "images/logos/arch.png"}
- { 'name': "CentOS",             'path': "images/logos/centos.png"}
- { 'name': "Debian",             'path': "images/logos/debian.png"}
- { 'name': "Fedora",             'path': "images/logos/fedora.png"}
- { 'name': "Linux",              'path': "images/logos/linux.png"}
- { 'name': "Redhat",             'path': "images/logos/redhat.png"}
- { 'name': "Ubuntu",             'path': "images/logos/ubuntu.png"}
- { 'name': "Windows XP/2003",    'path': "images/logos/windowsxp.png"}
- { 'name': "Windows 8",          'path': "images/logos/windows8.png"}


Branding the Sunstone Portal

You can easily add you logos to the login and main screens by updating the logo: attribute as follows:

  • The login screen is defined in the /etc/one/sunstone-views.yaml.
  • The logo of the main UI screen is defined for each view in the view yaml file.


OpenNebula Sunstone can be adapted to different user roles. For example, it will only show the resources the users have access to. Its behavior can be customized and extended via views.

The preferred method to select which views are available to each group is to update the group configuration from Sunstone; as described in Sunstone Views section. There is also the /etc/one/sunstone-views.yaml file that defines an alternative method to set the view for each user or group.

Sunstone will calculate the views available to each user using:

  • From all the groups the user belongs to, the views defined inside each group are combined and presented to the user
  • If no views are available from the user’s group, the defaults would be fetched from /etc/one/sunstone-views.yaml. Here, views can be defined for:
    • Each user (users: section), list each user and the set of views available for her.
    • Each group (groups: section), list the set of views for the group.
    • The default view, if a user is not listed in the users: section, nor its group in the groups: section, the default views will be used.
    • The default views for group admins, if a group admin user is not listed in the users: section, nor its group in the groups: section, the default_groupadmin views will be used.

By default users in the oneadmin group have access to all views, and users in the users group can use the cloud view.

The following /etc/one/sunstone-views.yaml example enables the user (user.yaml) and the cloud (cloud.yaml) views for helen and the cloud (cloud.yaml) view for group cloud-users. If more than one view is available for a given user the first one is the default.

logo: images/opennebula-sunstone-v4.0.png
        - cloud
        - user
        - cloud
    - user
    - groupadmin
    - cloud

A Different Endpoint for Each View

OpenNebula Sunstone views can be adapted to deploy a different endpoint for each kind of user. For example if you want an endpoint for the admins and a different one for the cloud users. You will just have to deploy a new sunstone server and set a default view for each sunstone instance:

# Admin sunstone
cat /etc/one/sunstone-server.conf

cat /etc/one/sunstone-views.yaml
      - admin
# Users sunstone
cat /etc/one/sunstone-server.conf

cat /etc/one/sunstone-views.yaml
      - user