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Drivers, Hardware Types and Hardware Interfaces

Generic Interfaces #

Hardware Types #

Changing Hardware Types and Interfaces #

Hardware types and interfaces are enabled in the configuration as described in Enabling drivers and hardware types. Usually, a hardware type is configured on enrolling as described in Enrollment:

baremetal node create --driver <hardware type>

Any hardware interfaces can be specified on enrollment as well:

baremetal node create --driver <hardware type> 
    \ --deploy-interface direct --<other>-interface <other implementation>

For the remaining interfaces the default value is assigned as described in Defaults for hardware interfaces. Both the hardware type and the hardware interfaces can be changed later via the node update API.

Changing Hardware Interfaces #

Hardware interfaces can be changed by the following command:

baremetal node set <NODE> \
    --deploy-interface direct \
    --<other>-interface <other implementation>

The modified interfaces must be enabled and compatible with the current node’s hardware type.

Changing Hardware Type #

Changing the node’s hardware type can pose a problem. When the driver field is updated, the final result must be consistent, that is, the resulting hardware interfaces must be compatible with the new hardware type. This will not work:

baremetal node create --name test --driver fake-hardware
baremetal node set test --driver ipmi

This is because the fake-hardware hardware type defaults to fake implementations for some or all interfaces, but the ipmi hardware type is not compatible with them. There are three ways to deal with this situation:

  1. Provide new values for all incompatible interfaces, for example:
baremetal node set test --driver ipmi \
    --boot-interface pxe \
    --deploy-interface direct \
    --management-interface ipmitool \
    --power-interface ipmitool
  1. Request resetting some of the interfaces to their new defaults by using the --reset-<IFACE>-interface family of arguments, for example:
baremetal node set test --driver ipmi \
    --reset-boot-interface \
    --reset-deploy-interface \
    --reset-management-interface \


This feature is available starting with ironic 11.1.0 (Rocky series, API version 1.45).

  1. Request resetting all interfaces to their new defaults:
baremetal node set test --driver ipmi --reset-interfaces

You can still specify explicit values for some interfaces:

baremetal node set test --driver ipmi --reset-interfaces \
    --deploy-interface direct

Static boot order configuration #

Some hardware is known to misbehave when changing the boot device through the BMC. To work around it you can use the noop management interface implementation with the ipmi and redfish hardware types. In this case the Bare Metal service will not change the boot device for you, leaving the pre-configured boot order.

For example, in case of the PXE boot:

  1. Via any available means configure the boot order on the node as follows:
    1. Boot from PXE/iPXE on the provisioning NIC.
      • If it is not possible to limit network boot to only provisioning NIC, make sure that no other DHCP/PXE servers are accessible by the node.
    2. Boot from hard drive.
  2. Make sure the noop management interface is enabled, for example:
enabled_hardware_types = ipmi,redfish
enabled_management_interfaces = ipmitool,redfish,noop
  1. Change the node to use the noop management interface:
baremetal node set <NODE> --management-interface noop

Unsupported drivers #

The following drivers were declared as unsupported in ironic Newton release and as of Ocata release they are removed from ironic:

The SSH drivers were removed in the Pike release. Similar functionality can be achieved either with VirtualBMC or using libvirt drivers from ironic-staging-drivers.

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