Prepare the virtual machine template¶

Change the directory to the kaas-bootstrap folder.
Download the ISO image of the required operating system (OS):
- Ubuntu 20.04 DVD ISO from Ubuntu images
- RHEL 7.8, 7.9, or 8.4 ^TechPreview DVD ISO from the RedHat Customer Portal
- Technology Preview: CentOS 7.9 DVD ISO from the CentOS mirrors

Export the following variables:

The path to the downloaded ISO file.
The vSphere cluster name.
The OS name: rhel or centos.
The OS version: 7.8, 7.9, or 8.4 ^TechPreview for RHEL; 7.9 for CentOS.
Optional. The virt-who user name and password for RHEL deployments.

For example, for RHEL:

export KAAS_VSPHERE_ENABLED=true
export VSPHERE_RO_USER=virt-who-user
export VSPHERE_RO_PASSWORD=virt-who-user-password
export VSPHERE_PACKER_ISO_FILE=$(pwd)/iso-file.dvd.iso
export VSPHERE_CLUSTER_NAME=vsphere-cluster-name
export VSPHERE_PACKER_IMAGE_OS_NAME=rhel
export VSPHERE_PACKER_IMAGE_OS_VERSION=7.9

Prepare the virtual machine template:
```
./bootstrap.sh vsphere_template
```
In templates/vsphere/machines.yaml.template, define the following parameters:
- rhelLicense
  RHEL license name defined in rhellicenses.yaml.template, defaults to kaas-mgmt-rhel-license. Remove or comment out this parameter for CentOS and Ubuntu deployments.
- diskGiB
  Disk size in GB for machines that must match the disk size of the VM template. The minimum and default size is 120 GB. For a bigger disk space to be available for cluster machines, set up and use a VM template with the corresponding disk size.
- template
  Path to the VM template prepared in the previous step.
Sample template:
```
spec:
  providerSpec:
    value:
      apiVersion: vsphere.cluster.k8s.io/v1alpha1
      kind: VsphereMachineProviderSpec
      rhelLicense: <rhelLicenseName>
      numCPUs: 8
      memoryMiB: 24576
      diskGiB: 120
      template: <vSphereVMTemplatePath>
```
Also, modify other parameters if required.