Guest Contextualization

The information defined at the VM Template building time is presented to the VM using the VMware VMCI channel. This information comes encoded in base64 can be gathered using the VMware Tools.

Packages for Linux and Windows exist that can collect this data and configure some parameters.

Parameter Description
SET_HOST Change the hostname of the VM. In Windows the machine needs to be restarted.
SSH_PUBLIC_KEY SSH public keys to add to authorized_keys file. This parameter only works with Linux guests.
USERNAME Create a new administrator user with the given user name. Only for Windows guests.
PASSWORD Password for the new administrator user. Used with USERNAME and only for Windows guests.
DNS Add DNS entries to resolv.conf file. Only for Linux guests.

In Linux guests, the information can be consumed using the following command (and acted accordingly):

$ vmtoolsd --cmd 'info-get guestinfo.opennebula.context' | base64 -d

Linux Packages

The linux packages can be downloaded from its project page and installed in the guest OS. There is one rpm file for Debian and Ubuntu and an rpm for RHEL and CentOS. After installing the package shutdown the machine and create a new template.

Windows Package

The official addon-opennebula-context provides all the necessary files to run the contextualization in Windows 2008 R2.

The contextualization procedure is as follows:

  1. Download startup.vbs and context.ps1 to the Windows VM and save them in C:\.
  2. Open the Local Group Policy Dialog by running gpedit.msc. Under: Computer Configuration -> Windows Settings -> Scripts -> startup (right click); browse to the startup.vbs file and enable it as a startup script.

After that power off the VM and create a new template from it.