181 lines
6.5 KiB
Groff
181 lines
6.5 KiB
Groff
.TH GRUBBY 8 "Wed Apr 29 2020"
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.SH NAME
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grubby \- command line tool for configuring grub and zipl
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.SH SYNOPSIS
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\fBgrubby\fR [--add-kernel=\fIkernel-path\fR] [--args=\fIargs\fR]
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[--bad-image-okay] [--config-file=\fIpath\fR] [--copy-default]
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[--default-kernel] [--default-index] [--default-title]
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[--env=\fIpath\fR] [--grub2] [--info=\fIkernel-path\fR]
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[--initrd=\fIinitrd-path\fR] [--extra-initrd=\fIinitrd-path\fR]
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[--make-default] [--remove-args=\fIargs\fR]
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[--remove-kernel=\fIkernel-path\fR] [--set-default=\fIkernel-path\fR]
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[--set-default-index=\fientry-index\fR] [--title=\fentry-title\fR]
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[--update-kernel=\fIkernel-path\fR] [--zipl] [--bls-directory=\fIpath\fR]
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.SH DESCRIPTION
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\fBgrubby\fR is a command line tool for updating and displaying information
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about the configuration files for the \fBgrub2\fR and \fBzipl\fR boot loaders.
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It is primarily designed to be used from scripts which install new kernels and
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need to find information about the current boot environment.
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On BIOS-based Intel x86 platforms, \fBgrub2\fR is the default bootloader and
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the configuration file is in \fB/boot/grub2/grub.cfg\fR. On UEFI-based Intel
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x86 platforms, \fBgrub2\fR is the default bootloader, and the configuration
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file is in \fB/boot/efi/EFI/redhat/grub.cfg\fR. On PowerPC platforms, systems
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based on Power8 and Power9 support \fBgrub2\fR as a bootloader and use a
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configuration stored in \fB/boot/grub2/grub.cfg\fR. On s390x platforms the
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\fBzipl\fR bootloader use a default configuration in \fB/etc/zipl.conf\fR.
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All bootloaders define the boot entries as individual configuration fragments
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that are stored by default in \fB/boot/loader/entries\fR. The format for the
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config files is specified at \fBhttps://systemd.io/BOOT_LOADER_SPECIFICATION\fR.
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The \fBgrubby\fR tool is used to update and display the configuration defined
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in the BootLoaderSpec fragment files.
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There are a number of ways to specify the kernel used for \fB-\-info\fR,
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\fB-\-remove-kernel\fR, and \fB-\-update-kernel\fR. Specificying \fBDEFAULT\fR
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or \fBALL\fR selects the default entry and all of the entries, respectively.
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Also, the title of a boot entry may be specified by using \fBTITLE=\fItitle\fR
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as the argument; all entries with that title are used.
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.SH OPTIONS
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.TP
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\fB-\-add-kernel\fR=\fIkernel-path\fR
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Add a new boot entry for the kernel located at \fIkernel-path\fR.
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.TP
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\fB-\-args\fR=\fIkernel-args\fR
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When a new kernel is added, this specifies the command line arguments
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which should be passed to the kernel by default (note they are merged
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with the arguments of the default entry if \fB-\-copy-default\fR is used).
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When \fB-\-update-kernel\fR is used, this specifies new arguments to add
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to the argument list. Multiple, space separated arguments may be used. If
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an argument already exists the new value replaces the old values. The
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\fBroot=\fR kernel argument gets special handling if the configuration
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file has special handling for specifying the root filesystem.
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.TP
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\fB-\-bad-image-okay\fR
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When \fBgrubby\fR is looking for an entry to use for something (such
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as a default boot entry) it uses sanity checks, such as ensuring that
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the kernel exists in the filesystem, to make sure entries that obviously
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won't work aren't selected. This option overrides that behavior, and is
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designed primarily for testing.
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.TP
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\fB-\-config-file\fR=\fIpath\fR
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Use \fIpath\fR as the configuration file rather then the default.
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.TP
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\fB-\-copy-default\fR
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\fBgrubby\fR will copy as much information (such as kernel arguments and
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root device) as possible from the current default kernel. The kernel path
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and initrd path will never be copied.
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.TP
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\fB-\-default-kernel\fR
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Display the full path to the current default kernel and exit.
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.TP
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\fB-\-default-index\fR
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Display the numeric index of the current default boot entry and exit.
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.TP
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\fB-\-default-title\fR
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Display the title of the current default boot entry and exit.
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.TP
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\fB-\-env\fR=\fIpath\fR
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Use \fIpath\fR as the grub2 environment block file rather then the default path.
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.TP
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\fB-\-grub2\fR
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Configure \fBgrub2\fR bootloader.
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.TP
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\fB-\-info\fR=\fIkernel-path\fR
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Display information on all boot entries which match \fIkernel-path\fR. If
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\fIkernel-path\fR is \fBDEFAULT\fR, then information on the default kernel
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is displayed. If \fIkernel-path\fR is \fBALL\fR, then information on all boot
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entries are displayed.
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.TP
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\fB-\-initrd\fR=\fIinitrd-path\fR
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Use \fIinitrd-path\fR as the path to an initial ram disk for a new kernel
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being added.
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.TP
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\fB-\-extrainitrd\fR=\fIinitrd-path\fR
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Use \fIinitrd-path\fR as the path to an auxiliary init ram disk image to be
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added to the boot entry.
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.TP
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\fB-\-make-default\fR
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Make the new kernel entry being added the default entry.
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.TP
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\fB-\-remove-args\fR=\fIkernel-args\fR
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The arguments specified by \fIkernel-args\fR are removed from the kernels
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specified by \fB-\-update-kernel\fR. The \fBroot\fR argument gets special
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handling for configuration files that support separate root filesystem
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configuration.
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.TP
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\fB-\-remove-kernel\fR=\fIkernel-path\fR
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Removes all boot entries which match \fIkernel-path\fR. This may be used
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along with -\-add-kernel, in which case the new kernel being added will
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never be removed.
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.TP
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\fB-\-set-default\fR=\fIkernel-path\fR
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The first entry which boots the specified kernel is made the default
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boot entry.
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.TP
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\fB-\-set-default-index\fR=\fIentry-index\fR
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Makes the given entry number the default boot entry.
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.TP
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\fB-\-title\fR=\fIentry-title\fR
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When a new kernel entry is added \fIentry-title\fR is used as the title
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for the entry.
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.TP
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\fB-\-update-kernel\fR=\fIkernel-path\fR
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The entries for kernels matching \fRkernel-path\fR are updated. Currently
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the only items that can be updated is the kernel argument list, which is
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modified via the \fB-\-args\fR and \fB-\-remove-args\fR options. If the
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\fBALL\fR argument is used the variable \fB GRUB_CMDLINE_LINUX\fR in
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\fB/etc/default/grub\fR is updated with the latest kernel argument list,
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unless the \fB-\-no-etc-grub-update\fR option is used or the file does not
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exist (e.g., on s390x).
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.TP
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\fB-\-zipl\fR
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Configure \fBzipl\fR bootloader.
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.TP
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\fB-\-bls-directory\fR=\fIpath\fR
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Use \fIpath\fR as the directory for the BootLoaderSpec config files rather
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than the default \fB/boot/loader/entries\fR.
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.TP
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\fB-\-no-etc-grub-update\fR
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Makes grubby to not update the \fBGRUB_CMDLINE_LINUX\fR variable in
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\fB/etc/default/grub\fR when the \fB-\-update-kernel\fR option is
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used with the \fBALL\fR argument.
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.SH "SEE ALSO"
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.BR zipl (8),
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.BR mkinitrd (8),
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.BR kernel-install (8)
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.SH AUTHORS
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.nf
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Erik Troan
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Jeremy Katz
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Peter Jones
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Javier Martinez
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.fi
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