grubby

GRUBBY(8)                   System Manager's Manual                  GRUBBY(8)



NAME
       grubby - command line tool for configuring grub, lilo, and elilo


SYNOPSIS
       grubby [--add-kernel=kernel-path] [--args=args]
              [--bad-image-okay] [--boot-filesystem=bootfs]
              [--bootloader-probe] [--config-file path]
              [--copy-default] [--default-kernel]
              [--grub] [--lilo] [--yaboot] [--silo] [--zipl]
              [--info=kernel-path] [--initrd=initrd-path]
              [--make-default] [-o path] [--version]
              [--remove-kernel=kernel-path] [--remove-args=args]
              [--set-default=kernel-path] [--title=entry-title]
              [--add-multiboot=multiboot-path] [--mbargs=args]
              [--remove-multiboot=multiboot-path] [--remove-mbargs=args]


DESCRIPTION
       grubby is a command line tool for updating and displaying information
       about the configuration files for the grub, lilo, elilo (ia64), yaboot
       (powerpc) and zipl (s390) boot loaders. It is primarily designed to be
       used from scripts which install new kernels and need to find
       information about the current boot environment.

       On Intel x86 platforms, grub is the default bootloader and the
       configuration file is in /boot/grub/grub.conf. On Intel ia64 platforms,
       elilo mode is used and the default location for the configuration file
       is /boot/grub/grub.conf. On PowerPC platforms, yaboot parsing is used
       and the configuration file should be in /etc/yaboot.conf.

       There are a number of ways to specify the kernel used for --info,
       --remove-kernel, and --update-kernel. Specificying DEFAULT or ALL
       selects the default entry and all of the entries, respectively.  If a
       comma separated list of numbers is given, the boot entries indexed by
       those numbers are selected. Finally, the title of a boot entry may be
       specified by using TITLE=title as the argument; all entries with that
       title are used.


OPTIONS
       --add-kernel=kernel-path
              Add a new boot entry for the kernel located at kernel-path.


       --args=kernel-args
              When a new kernel is added, this specifies the command line
              arguments which should be passed to the kernel by default (note
              they are merged with the arguments from the template if --copy-
              default is used).  When --update-kernel is used, this specifies
              new arguments to add to the argument list. Multiple, space
              separated arguments may be used. If an argument already exists
              the new value replaces the old values. The root= kernel argument
              gets special handling if the configuration file has special
              handling for specifying the root filesystem (like lilo.conf
              does).


       --bad-image-okay
              When grubby is looking for a entry to use for something (such as
              a template or a default boot entry) it uses sanity checks, such
              as ensuring that the kernel exists in the filesystem, to make
              sure entries that obviously won't work aren't selected. This
              option overrides that behavior, and is designed primarily for
              testing.


       --boot-filesystem=bootfs
              The grub boot loader expects file paths listed in it's
              configuration path to be relative to the top of the filesystem
              they are on, rather then relative to the current root
              filesystem. By default grubby searches the list of currently
              mounted filesystems to determine this. If this option is given
              grubby acts as if the specified filesystem was the filesystem
              containing the kernel (this option is designed primarily for
              testing).


       --bootloader-probe
              grubby tries to determine if grub or lilo is currently
              installed. When one of those bootloaders is found the name of
              that bootloader is displayed on stdout.  Both could be installed
              (on different devices), and grubby will print out the names of
              both bootloaders, one per line. The probe for grub requires a
              commented out boot directive grub.conf identical to the standard
              directive in the lilo configuration file. If this is not present
              grubby will assume grub is not installed (note that anaconda
              places this directive in grub.conf files it creates).  This
              option is only available on ia32 platforms.



       --config-file=path
              Use path as the configuration file rather then the default.


       --copy-default
              grubby will copy as much information (such as kernel arguments
              and root device) as possible from the current default kernel.
              The kernel path and initrd path will never be copied.


       --default-kernel
              Display the full path to the current default kernel and exit.


       --elilo
              Use an elilo style configuration file.


       --grub Use a grub style configuration file instead of lilo style. This
              is the default on ia32 platforms.


       --info=kernel-path
              Display information on all boot entries which match kernel-path.
              I


       --initrd=initrd-path
              Use initrd-path as the path to an initial ram disk for a new
              kernel being added.


       --lilo Use a lilo style configuration file.


       --make-default
              Make the new kernel entry being added the default entry.


       --remove-args=kernel-args
              The arguments specified by kernel-args are removed from the
              kernels specified by --update-kernel. The root argument gets
              special handling for configuration files that support separate
              root filesystem configuration.


       --remove-kernel=kernel-path
              Removes all boot entries which match kernel-path. This may be
              used along with --add-kernel, in which case the new kernel being
              added will never be removed.


       --set-default=kernel-path
              The first entry which boots the specified kernel is made the
              default boot entry.


       --title=entry-title
              When a new kernel entry is added entry-title is used as the
              title (lilo label) for the entry. If entry-title is longer then
              maximum length allowed by the bootloader (15 for lilo, unlimited
              for grub and elilo) the title is shortened to a (unique) entry.


       --update-kernel=kernel-path
              The entries for kernels matching kernel-path are updated.
              Currently the only items that can be updated is the kernel
              argument list, which is modified via the --args and --remove-
              args options.


       --version
              Display the version of grubby being run and then exit
              immediately.


       --yaboot
              Use an yaboot style configuration file.


       --zipl Use an zipl style configuration file.


MULTIBOOT OPTIONS
       The Multiboot Specification provides a genreic interface for boot
       loaders and operating systems.  It is supported by the GRUB bootloader.


       --add-multiboot=multiboot-path
              Add a new boot entry for the multiboot kernel located at
              multiboot-path.  Note that this is generally accompanied with a
              --add-kernel option.


       --remove-multiboot=multiboot-path
              Removes all boot entries which match multiboot-path.


       --mbargs=multiboot-args
              When a new multiboot kernel is added, this specifies the command
              line arguments which should be passed to that kernel by default
              When --update-kernel is used, this specifies new arguments to
              add to the argument list. Multiple, space separated arguments
              may be used. If an argument already exists the new value
              replaces the old values.


       --remove-mbargs=multiboot-args
              The arguments specified by multiboot-args are removed from the
              kernels specified by --update-kernel.



BUGS
       The command line syntax is more than a little baroque. This probably
       won't be fixed as grubby is only intended to be called from shell
       scripts which can get it right.


SEE ALSO
       grub(8), lilo(8), yaboot(8), mkinitrd(8)


AUTHORS
       Erik Troan
       Jeremy Katz
       Peter Jones



                                Tue Jan 18 2005                      GRUBBY(8)