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 Server Install Image 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 GiB for machines that must match the disk size of the VM template. You can leave this parameter commented to use the disk size of the VM template. The minimum requirement is 120 GiB.
- 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.