Contextualization of Windows VMs

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OpenNebula uses a method called contextualization to send information to the VM at boot time. Information is collected in the Template and is essential to configure the VM.

The VM template has a section called "Context" where you can automate different configuration aspects.

The Context section has 3 parts:

Configuration

Template-Configuration.png

This is the most basic context configuration provided by OpenNebula, where you can:

  • Enable SSH and Network contextualization. Text to be added
  • Add SSH public keys. Keys will be added to USERNAME authorized_keys file (See custom section) or to root in case USERNAME is not set.
  • START_SCRIPT - Script which is executed when the machine starts up. It can contain either shell script or Shebang. For example START_SCRIPT="yum upgrade".

Files

Template-Files.png

You can select files you want to include from the list and they will be automatically added in FILES_DS attribute.

Also you can define a space-separated list of scripts that will run at boot, using INIT_SCRIPTS attribute.

Files can be added in "Files" section in the left menu under "Images".

Images-Files.png


Make sure that context.ps1 has been selected.

Custom Vars

Template-CustomVars.png

In this section you can setup a more advanced contextualization, the attributes available are:

  • VARIABLE - Variables that store values related to this virtual machine or others . The name of the variable is arbitrary (in the example, we use hostname).
  • SET_HOSTNAME - This parameter value will be the hostname of the VM.
  • ETHx_MAC - Used to find the correct interface
  • ETHx_IP - IPv4 address for the interface
  • ETHx_NETWORK - Network address of the interface
  • ETHx_MASK - Network mask
  • ETHx_GATEWAY - Default IPv4 gateway for the interface
  • ETHx_DNS - DNS for the network
  • USERNAME - User to be created in the guest OS. If any password attribute is defined (see below) it will change this user (defaults to root).
  • PASSWORD_BASE64 - Password encoded in base64. To be set for the user USERNAME.
  • PASSWORD - Password to be set for the user USERNAME. This parameter is not recommended, use PASSWORD_BASE64 instead.
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