Most likely, you don't need to do anything to enable , as it is enabled by default on your ESXi hypervisor.
Memory ballooning is driven by the VMware Tools software, so you'll need it installed on all your VMs. It will load the vmmemctl driver, which is responsible for memory ballooning.
Perform the following steps if VMware Tools is not installed or is out of date:
- Log in to VMware vSphere Web Client.
- In the VM inventory, right-click on the VM, select Guest OS, then click on Install VMware Tools or Upgrade VMware Tools.
- Go to the VM Console and follow the onscreen instructions to install or upgrade it.
Similarly, host-level or hypervisor swapping is enabled by default. You don't need to perform any additional steps to enable it.