You can install or upgrade ESXi from a CD-ROM or DVD-ROM drive by using a script that specifies the installation or upgrade options.

You can start the installation or upgrade script by entering a boot option when you start the host. You can also create an installer ISO image that includes the installation script. With an installer ISO image, you can perform a scripted, unattended installation when you boot the resulting installer ISO image. See Create an Installer ISO Image with a Custom Installation or Upgrade Script.


Before you run the scripted installation or upgrade, verify that the following prerequisites are met:


  1. Boot the ESXi installer from the local CD-ROM or DVD-ROM drive.
  2. When the ESXi installer window appears, press Shift+O to edit boot options.
    ESXi Installer screen
  3. Type a boot option that calls the default installation or upgrade script or an installation or upgrade script file that you created.
    The boot option has the form ks=.
  4. Press Enter.


The installation, upgrade, or migration runs, using the options that you specified.