/[magellan-source]/tags/grubby-8_40_20170706/grubby.8

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-revision 3012 by niro,
Tue Jun 27 14:32:57 2017 UTC
+revision 3016 by niro,
Tue Jun 27 14:35:32 2017 UTC
 Line 2
  .SH NAME
- grubby \- command line tool for configuring grub, lilo, elilo, yaboot and zipl
+ grubby \- command line tool used to configure bootloader menu entries across
+ multiple architectures
  .SH SYNOPSIS
- \fBgrubby\fR [--add-kernel=\fIkernel-path\fR] [--args=\fIargs\fR]
+ \fBgrubby\fR [\fIOPTIONS\fR]
-        [--bad-image-okay] [--boot-filesystem=\fIbootfs\fR]
-        [--bootloader-probe] [--config-file \fIpath\fR] [--copy-default]
-        [--debug] [--default-kernel] [--default-index] [--default-title]
-        [--devtree=\fIdevicetree.dtb\fR] [--set-index=\fIentry-index\fR]
-        [--grub] [--lilo] [--yaboot] [--silo] [--zipl]
-        [--info=\fIkernel-path\fR] [--initrd=\fIinitrd-path\fR]
-        [--make-default] [-o path] [--version]
-        [--remove-kernel=\fIkernel-path\fR] [--remove-args=\fIargs\fR]
-        [--set-default=\fIkernel-path\fR] [--set-default-index=\fIentry-index\fR]
-        [--title=entry-title] [--add-multiboot=\fImultiboot-path\fR]
-        [--mbargs=\fIargs\fR] [--remove-multiboot=\fImultiboot-path\fR]
-        [--remove-mbargs=\fIargs\fR]
  .SH DESCRIPTION
  .SS General Information
  \fBgrubby\fR is a command line tool for updating and displaying information
- about the configuration files for the \fBgrub\fR, \fBlilo\fR, \fBelilo\fR
+ about the configuration files for various architecture specific bootloaders.
- (ia64), \fByaboot\fR (powerpc) and \fBzipl\fR (s390) boot loaders. It
+ It is primarily designed to be used from scripts which install new kernels
- is primarily designed to be used from scripts which install new
+ and need to find information about the current boot environment.
- kernels and need to find information about the current boot environment.
  .SS Architecture Support
- On BIOS-based Intel x86 platforms, \fBgrub2\fR is the default bootloader and
+ The \fBgrubby\fR executable has full support for the \fBgrub2\fR
- the configuration file is in \fB/boot/grub2/grub.cfg\fR.  On UEFI-based Intel
+ bootloader on \fBx86_64\fR systems using legacy BIOS or modern
- x86 platforms, \fBgrub2\fR is the default bootloader, and the configuration
+ UEFI firmware and \fBppc64\fR and \fBppc64le\fR hardware using
- file is in \fB/boot/efi/EFI/redhat/grub.cfg\fR.  On Intel ia64 platforms,
+ OPAL or SLOF as firmware.
- \fBelilo\fR mode is used and the default location for the configuration file
- is \fB/boot/efi/EFI/redhat/elilo.conf\fR. On PowerPC platforms, systems based
+ Legacy \fBs390\fR and the current \fBs390x\fR architectures
- on Power8 now support \fBgrub2\fR as a bootloader and store using a default
+ and their \fBzipl\fR bootloader are fully supported.
- config stored in \fB/boot/grub2/grub.cfg\fR. The earlier Power7 systems use \fByaboot\fR
- parsing and the configuration file should be in \fB/etc/yaboot.conf\fR.  On
+ Support for \fByaboot\fR has been deprecated as all ppc architecture
- s390 platforms the \fBzipl bootloader\fR will read from \fB/etc/zipl.conf\fR.
+ hardware since the Power8 uses \fBgrub2\fR or petitboot
+ which both use the grub2 configuration file format.
+ Legacy bootloaders \fBLILO\fR, \fBSILO\fR, and \fBELILO\fR
+ are deprecated and no longer receiving active support in favor of
+ previously mentioned bootloaders.
+ .SS Default Behavior
+ The default bootloader target is primarily determined by the architecture
+ for which grubby has been built.  Each architecture has a preferred
+ bootloader, and each bootloader has its own configuration file.  If no
+ bootloader is selected on the command line, grubby will use these default
+ settings to search for an existing configuration.  If no bootloader
+ configuration file is found, grubby will use the default value for that
+ architecture.  These defaults are listed in the table below.
+ .TS
+ allbox;
+ lbw6 lbw10 lbw18
+ l l l.
+  Arch	Bootloader	Configuration File
+  x86_64 [BIOS]	grub2	/boot/grub2/grub.cfg
+  x86_64 [UEFI]	grub2	/boot/efi/EFI/redhat/grub.cfg
+  i386	grub2	/boot/grub2/grub.cfg
+  ia64	elilo	/boot/efi/EFI/redhat/elilo.conf
+  ppc [>=Power8]	grub2	/boot/grub2/grub.cfg
+  ppc [<=Power7]	yaboot	/etc/yaboot.conf
+  s390	zipl	/etc/zipl.conf
+  s390x	zipl	/etc/zipl.conf
+ .TE
  .SS Special Arguments
  There are a number of ways to specify the kernel used for \fB-\-info\fR,
- \fB-\-remove-kernel\fR, and \fB-\-update-kernel\fR. Specificying \fBDEFAULT\fR
+ \fB-\-remove-kernel\fR, and \fB-\-update-kernel\fR. Specifying \fBDEFAULT\fR
  or \fBALL\fR 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
-Line 59 
 with that title are used.
+Line 78 
 with that title are used.
  .TP
  \fB-\-add-kernel\fR=\fIkernel-path\fR
- Add a new boot entry for the kernel located at \fIkernel-path\fR.
+ Add a new boot entry for the kernel located at \fIkernel-path\fR. A title for
+ the boot entry must be set using \fB-\-title\fR. Most invocations should also
+ include \fB-\-initrd\fR with memtest86 as a notable exception.
+ The \fB-\-update-kernel\fR option may not be used in the same invocation.
  .TP
  \fB-\-remove-kernel\fR=\fIkernel-path\fR
- Removes all boot entries which match \fIkernel-path\fR. This may be used
+ Remove all boot entries which match \fIkernel-path\fR. This may be used
- along with -\-add-kernel, in which case the new kernel being added will
+ along with \fB-\-add-kernel\fR, in which case the new entry being added will
- never be removed.
+ not be removed.
  .TP
  \fB-\-update-kernel\fR=\fIkernel-path\fR
- The entries for kernels matching \fRkernel-path\fR are updated. Currently
+ Update the entries for kernels matching \fRkernel-path\fR. Currently
- the only items that can be updated is the kernel argument list, which is
+ the only item that can be updated is the kernel argument list, which is
  modified via the \fB-\-args\fR and \fB-\-remove-args\fR options.
  .TP
-Line 111 
 Use \fIinitrd-path\fR as the path to an
+Line 134 
 Use \fIinitrd-path\fR as the path to an
  being added.
  .TP
+ \fB-\-efi\fR
+ Use appropriate bootloader commands for EFI on this architecture.
+ .TP
  \fB-\-set-default\fR=\fIkernel-path\fR
  The first entry which boots the specified kernel is made the default
- boot entry.
+ boot entry. This may not be invoked with \fB-\-set-default-index\fR.
  .TP
  \fB-\-set-default-index\fR=\fIentry-index\fR
- Makes the given entry number the default boot entry.
+ Makes the given entry number the default boot entry. This may not
+ be invoked with \fB-\-set-default\fR.
  .TP
  \fB-\-make-default\fR
-Line 131 
 Set the position at which to add a new e
+Line 159 
 Set the position at which to add a new e
  \fB-\-debug\fR
  Display extra debugging information for failures.
+ .TP
+ \fB-i\fR, \fB-\-extra-initrd\fR=\fIinitrd-path\fR
+ Use \fIinitrd-path\fR as the path for an auxiliary initrd image.
  .SS Display Options
+ Passing the display option to grubby will cause it to print out the
+ requested information about the current bootloader configuration and
+ then immediately exit.  These options should not be used in any
+ script intended to update the bootloader configuration.
  .TP
  \fB-\-default-kernel\fR
  Display the full path to the current default kernel and exit.
-Line 151 
 Display information on all boot entries
+Line 188 
 Display information on all boot entries
  .TP
  \fB-\-bootloader-probe\fR
+ Attempt to probe for installed bootloaders.  If this option is specified,
  \fBgrubby\fR tries to determine if \fBgrub\fR or \fBlilo\fR is currently
- installed. When one of those bootloaders is found the name of that bootloader
+ installed. When one of those bootloaders is found the name of that
- is displayed on stdout.  Both could be installed (on different devices), and
+ bootloader is displayed on stdout.  Both could be installed (on different
- grubby will print out the names of both bootloaders, one per line. The probe
+ devices), and grubby will print out the names of both bootloaders, one per
- for \fBgrub\fR requires a commented out boot directive \fBgrub.conf\fR
+ line. The probe for \fBgrub\fR requires a commented out boot directive
- identical to the standard directive in the lilo configuration file. If this
+ \fBgrub.conf\fR identical to the standard directive in the lilo
- is not present \fBgrubby\fR will assume grub is not installed (note
+ configuration file. If this is not present \fBgrubby\fR will assume grub is
- that \fBanaconda\fR places this directive in \fBgrub.conf\fR files it creates).
+ not installed (note that \fBanaconda\fR places this directive in
- This option is only available on ia32 platforms.
+ \fBgrub.conf\fR files it creates).
+ \fIThis option is only available on x86 BIOS platforms.\fR
  .TP
- \fB-\-version\fR
+ \fB-v\fR, \fB-\-version\fR
  Display the version of \fBgrubby\fR being run and then exit immediately.
  .SS Output Format Options
+ Sane default options for the current platform are compiled into grubby on
+ a per platform basis. These defaults determine the format and layout of
+ the generated bootloader configuration file. A different configuration file
+ format may be specified on the command line if the system uses a supported
+ alternative bootloader.
  .TP
  \fB-\-elilo\fR
- Use an \fBelilo\fR style configuration file.
+ Use an \fBelilo\fR style configuration file. This is the default on ia64
+ platforms. This format is deprecated.
+ .TP
+ \fB-\-extlinux\fR
+ Use an \fBextlinux\fR style configuration file. This format is deprecated.
  .TP
  \fB-\-grub\fR
- Use a \fBgrub\fR style configuration file instead of \fBlilo\fR style. This
+ Use a \fBgrub\fR style configuration file. This is the default on the i386
- is the default on ia32 platforms.
+ architecture.
+ .TP
+ \fB-\-grub2\fR
+ Use a \fBgrub2\fR style configuration file. This is the default on
+ \fBx86_64\fR architecture as well as the \fBppc64\fR and \fBppc64le\fR
+ architectures running on Power8 or later hardware.
  .TP
  \fB-\-lilo\fR
  Use a \fBlilo\fR style configuration file.
  .TP
+ \fB-\-silo\fR
+ Use a \fBsilo\fR style configuration file. This is the default on SPARC
+ systems. This format is legacy, deprecated, and unsupported.
+ .TP
  \fB-\-yaboot\fR
- Use an \fByaboot\fR style configuration file.
+ Use a \fByaboot\fR style configuration file. This is the default for
+ the \fBppc\fR architecture on on Power7 and earlier hardware.
  .TP
  \fB-\-zipl\fR
- Use an \fBzipl\fR style configuration file.
+ Use a \fBzipl\fR style configuration file. This is the default on the
+ legacy s390 and current s390x architectures.
  .SS Override Options
-Line 200 
 that behavior, and is designed primarily
+Line 264 
 that behavior, and is designed primarily
  .TP
  \fB-\-boot-filesystem\fR=\fIbootfs\fR
- The \fBgrub\fR boot loader expects file paths listed in it's configuration
+ The \fBgrub\fR boot loader expects file paths listed in its configuration
  path to be relative to the top of the filesystem they are on, rather then
  relative to the current root filesystem. By default \fBgrubby\fR searches
  the list of currently mounted filesystems to determine this. If this option
-Line 208 
 is given \fBgrubby\fR acts as if the spe
+Line 272 
 is given \fBgrubby\fR acts as if the spe
  containing the kernel (this option is designed primarily for testing).
  .TP
- \fB-\-config-file\fR=\fIpath\fR
+ \fB-\-env\fR=\fIpath\fR
+ Path for the file where grub environment data is stored.
+ .TP
+ \fB-c\fR, \fB-\-config-file\fR=\fIpath\fR
  Use \fIpath\fR as the configuration file rather then the default.
- \fB-\-devtree\fR=\fIpath\fR
+ .TP
+ \fB-o\fR, \fB-\-output-file\fR=\fIfile_path\fR
+ The destination path for the updated configuration file. Use "-" to
+ send it to stdout.
+ .TP
+ \fB-\-devtree\fR=\fIfile_path\fR
  Use \fIpath\fR for device tree path in place of the path of any devicetree
  directive found in the template stanza.
+ .TP
+ \fB-\-devtreedir\fR=\fIfile_path\fR
+ Use the specified \fIfile path\fR to load the devicetree definition. This is
+ for platforms where a flat file is used instead of firmware to instruct the
+ kernel how to communicate with devices.
  .SS Multiboot Options
- The Multiboot Specification provides a genreic interface for boot
+ The Multiboot Specification provides a generic interface for boot
  loaders and operating systems.  It is supported by the GRUB bootloader.
  .TP
  \fB-\-add-multiboot\fR=\fImultiboot-path\fR
  Add a new boot entry for the multiboot kernel located at
  \fImultiboot-path\fR.  Note that this is generally accompanied with a
- \fI--add-kernel\fR option.
+ \fB--add-kernel\fR option.
  .TP
  \fB-\-remove-multiboot\fR=\fImultiboot-path\fR
-Line 249 
 The command line syntax is more than a l
+Line 329 
 The command line syntax is more than a l
  won't be fixed as \fBgrubby\fR is only intended to be called from shell
  scripts which can get it right.
+ .SH EXAMPLE
+ The following examples assume the following:
+ .TS
+ allbox;
+ rbw15 l.
+ cfg_file	Full path to bootloader config file
+ new_kernel	Full path to kernel image to be installed
+ old_kernel	Full path to old kernel image to be removed
+ current_kernel	Full path to a currently installed kernel
+ entry_title	Title that appears on bootloader menu
+ new_initrd	Full path to initrd for a new kernel
+ kernel_args	Set of arguments for the kernel
+ menu_index	Index number of a menu entry
+ .TE
+ The examples below quote strings that may have spaces or other whitespace in
+ them. It is also perfectly valid to backslash escape these strings if that
+ is more convenient.
+ .PP
+ Add a new kernel entry and copy all options from the current default kernel.
+ This is the behavior that most users will want.
+ .IP
+ \fBgrubby\fR --add-kernel=\fInew_kernel\fR --title="\fIentry_title\fR" --initrd="\fInew_initrd\fR" --copy-default
+ .PP
+ Add a new kernel entry with custom arguments
+ .IP
+ \fBgrubby\fR --add-kernel=\fInew_kernel\fR --title="\fIentry_title\fR" --initrd="\fInew_initrd\fR" --args=\fIkernel_args\fR
+ .PP
+ Remove \fBall menu entries\fR for a specified kernel.
+ .IP
+ \fBgrubby\fR --remove-kernel=\fIold_kernel\fR
+ .PP
+ Target a single menu entry to remove without targetting other entries with
+ the same kernel.
+ .IP
+ \fBgrubby\fR --info=\fIold_kernel\fR
+ \fBgrubby\fR --remove-kernel=\fImenu_index\fR
+ .PP
+ Update the arguments for all entries of a specific kernel. New arguments get
+ added while existing arguments get updated values.
+ .IP
+ \fBgrubby\fR --update-kernel=\fIcurrent_kernel\fR --args="\fIkernel_args\fR"
+ .PP
+ Remove the arguments for a single entry of a specific kernel.
+ .IP
+ \fBgrubby\fR --info=\fIcurrent_kernel\fR
+ \fBgrubby\fR --remove-args=\fImenu_index\fR --args="\fIkernel_args\fR"
  .SH "SEE ALSO"
  .BR grub (8),
  .BR lilo (8),
  .BR yaboot (8),
+ .BR zipl (8),
+ .BR dracut (8),
  .BR mkinitrd (8)
  .SH AUTHORS
-Line 262 
 scripts which can get it right.
+Line 397 
 scripts which can get it right.
  Erik Troan
  Jeremy Katz
  Peter Jones
+ Robert Marshall
  .fi

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