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A Red Hat training course is available for Red Hat Enterprise Linux Specifying boot order

To specify the boot order, use a management tool to make the following changes to the domain XML:

    <interface type='network'>
      <source network='default'/>
      <target dev='vnet1'/>
      <boot order='1'/>

Figure 20.49. Specifying boot order

For hypervisors which support it, you can set a specific NIC to be used for the network boot. The order of attributes determine the order in which devices will be tried during boot sequence. Note that the per-device boot elements cannot be used together with general boot elements in BIOS boot loader section.