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You can set guest variables to pass user data to your VMs before deployment. This functionality uses cloud-init and requires appropriate templates. In private cloud, the VM templates must have the guest setup flag set to cloud init.

You can add, modify or delete guest variables, BEFORE you deploy the VM.

Add variables

To add variables:

1. Edit the VM and open the Variables tab

   1. The dialog will display the default variables for your template

2. For each variable:
   1. Enter the Key and Value, . 
      • The maximum length for VM variables is a key of 255 characters and value of 255 characters.
   2. Click Add
3. To apply changes to variables, and other changes to the VM, click Save

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Edit variable values

To edit a variable:

1. Click the pencil edit button next to the value
2. Click ok
3. To apply changes to variables, and other changes to the VM, click Save

Delete variables

To delete a variable:

1. Click the X in the left column beside the variable name.
2. To apply changes to variables, and other changes to the VM, click Save

Read Guest Variables

The variable location will depend on the method of guest setup that you are using for your VM.

Private cloud:

When using cloud-init, the variables are stored on the cloud-init ISO, which has the label "config-2". The variables file is "openstack/latest/vm-variables.rc"

When using hypervisor tools, you should use the appropirate method for your hypervisor, for example:

Run the following command in the guest to get the value of a variable:

vmtoolsd --cmd "info-get guestinfo.abiquo.<variable-name>"

On Unix guests, run the following command:

xenstore-ls vm-data

Public cloud:

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Read guest variables from a VM Read guest variables from a VM