bootmgr — tool for configuring Kernun boot manager
bootmgr [-x] [-d
{ 1 | 2 | 3 }
] [ -u | -n ] [-1
label | + | -
] [-2
label | + | -
] [-3
label | + | -
] [dev]
Utility bootmgr can be used to view or change
configuration of the Kernun boot manager. If invoked without command line
parameters, the boot manager configuration is displayed in a text format.
If only option -x is specified, the boot manager
configuration is displayed in XML. Other command line options set
various parameters of the boot manager.
The boot manager displays a boot menu that allows to boot one from up to three installations (in the first three disk slices) of the Kernun firewall. For security reasons, the administrator can disable some menu choices. There is always a default selection, that is booted after a timeout if no key is pressed. It is configurable whether selection of a non-default choice changes the default for next reboots or not.
The Kernun boot manager is a slightly modified FreeBSD boot manager.
It is installed by the Kernun installation process into the MBR (Master
Boot Record) of the system disk. It can be reinstalled by
boot0cfg(8), but this is almost never needed. The main difference from
the FreeBSD loader is the boot menu. Instead of slice types, it shows
changeable labels of individual Kernun installation. There are two
variants of the boot manager boot0 and
boot0ext, stored in directory
/usr/local/kernun/lib. The preferred variant is
boot0ext, which is two sectors (1024 B) long. It
has space for 74 character labels. By default, a label contains
a Kernun version identification, including a full build number, and the
date and time of the installation. The smaller, one sector (512 B)
variant boot0 has space for ony 9 character
labels. By default a label contains date and time of the Kernun
installation.
-xDisplays boot manager configuration in XML.
-d
{1 | 2 | 3}the default slice to boot from
-uSelection from the boot menu will update the default choice.
-nSelection from the boot menu will leave the default choice unchanged.
-1
label-2
label-3
labelChanges a label of a menu item.
-1 +-2 +-3 +Enables a menu item and booting from the corresponding slice.
-1 --2 --3 -Disables a menu item and booting from the corresponding slice. Use with caution, as disabling all working Kernun installations will render the system unable to boot. In such situation, the boot manager may be reconfigured using the installation medium.
devOperates on the boot manager located on this disk device. If not used, the disk containing the root file system is selected.