Virtual Networks Templates

The Virtual Network Templates allows the end user to create virtual networks without knowing the details of the underlying infrastructure. Typically the administrator sets up the templates with the required physical attributes, e.g. driver or physical device information and let the end user to add all the logic information like address ranges or gateway.

Virtual Network Templates can be instantiated several times and shared between multiple users.

Virtual Network Template Definition

A Virtual Network Template is a representation of a Virtual Network, so a template can be defined by using the same attributes available for a Virtual Network. Virtual Network Templates and Virtual Networks also share their required attributes depending on driver they are using (see the requirements here, Physical Network Attributes section).

When a network is created by instantiating a Virtual Network Template, it is associated to the default cluster. You can control which clusters the networks will be in with the CLUSTER_IDS attribute.

Here is an example of a Virtual Network Template with one address range:

TYPE="IP4" ]

The networks created by instantiating this template will be on clusters 1 and 100.

Using Virtual Network Templates

By default just oneadmin can create Virtual Network Templates, if other users need permissions for creating Virtual Network Templates it can be provided by creating a specific ACL.

Once the Virtual Network Template is created, you can control access to it by its permissions. For example, if a end user needs to instantiate an specific template, it would be enough to give the template USE permission for others. You can find more information about permissions here.


Depending on the user, ACLs might need to be created in order to allow the users to manage their own networks.


The available operations for Virtual Network Templates are the following:

  • allocate

  • instantiate

  • info

  • update

  • delete

  • chown

  • chmod

  • clone

  • rename

  • lock

  • unlock

Preparing Virtual Network Templates for End-Users

First create a Virtual Network Template and set all the attributes which need to be set to define the Virtual Network at the template like bridge, vlan id, etc.


Note that Virtual Network restricted attributes will be also restricted for virtual network templates.

$ cat vn_template.txt
$ onevntemplate create vn_template.txt
  ID: 0

Once the Virtual Network Template has been creted, change the permissions to make it available for the users you want. In the example below all the users will be able to instantiate the template:

$ onevntemplate chmod 0 604
$ onevntemplate show 0
  ID             : 0
  NAME           : vntemplate
  USER           : oneadmin
  GROUP          : oneadmin
  LOCK           : None
  REGISTER TIME  : 11/28 14:44:21

  OWNER          : um-
  GROUP          : ---
  OTHER          : u--

#check everything works well
$ onevntemplate instantiate 0 --user user --name private
  VN ID: 1
$ onevnet list
  ID USER          GROUP        NAME            CLUSTERS   BRIDGE  STATE  LEASES
  1  user          users        private         0          virbr0  rdy         0

The network is now ready, users can create VMs and attach their interfaces to the newly created Virtual Network. Simply adding NIC = [ NETWORK = private ] or selecting it through Sunstone.


Note that for using the newly created Virtual Network, the user needs to define an Address Range either during the Virtual Network Template instantiation or just updating the Virtual Network.