Default section

Ubuntu 22.04 LTS LPAR mode z/VM guest KVM guest

The default section consists of the section identifier, [defaultboot], followed by a single option line.

The option line specifies one of these mutually exclusive options:

default=<section_name>

where <section_name> is one of the IPL configurations described in the configuration file. If the configuration file is called without a section specification, an IPL device is prepared according to this IPL configuration.

If you specify a target parameter with this option, <section_name> is ignored and a menu with all DASD and SCSI IPL sections is built as for the defaultauto option.

defaultmenu=<menu_name>

where <menu_name> is the name of a menu configuration that is described in the configuration file. If the configuration file is called without a section specification, IPL devices are prepared according to this menu configuration. The defaultmenu option tolerates but does not require target parameters for the individual IPL sections.

defaultauto

If the configuration file is called without a section specification, a menu configuration is built. This configuration contains all DASD and SCSI IPL configurations in the configuration file. In the menu, these configurations appear in the order in which they appear in the configuration file.

The defaultauto option requires an additional option line with the target parameter. You can add further option lines with the default, prompt, and timeout parameters. These parameters have the same meaning as in menu configurations.

The defaultauto option tolerates but does not require target parameters for the individual IPL sections. The resulting menu configuration is always written to the directory specified with the target parameter line within the default section.

As for configuration sections, extra parameters might be required for logical boot devices.

Examples

This default specification points to a boot configuration boot1 as the default.
```
[defaultboot]
default=boot1
```
This default specification points to a menu configuration with a menu menu1 as the default.
```
[defaultboot]
defaultmenu=menu1
```
This default specification creates a menu with all IPL sections in the configuration file. The first IPL configuration in the automatically created menu is the default.
```
[defaultboot]
defaultauto
target=/boot
default=1
```