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grub(7)

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                                                                       grub(7)



NAME
       grub - GRand Unified Bootloader 2 software on Oracle Solaris

DESCRIPTION
       The  current  release of the Oracle Solaris operating system is shipped
       with the GRUB (GRand Unified Bootloader) 2 software. GRUB is  developed
       and supported by the Free Software Foundation.


       The  overview for the GRUB Manual, accessible at www.gnu.org, describes
       GRUB:


       Briefly, a boot loader is the first software program that runs  when  a
       computer starts. It is responsible for loading and transferring control
       to an operating system kernel software (such as Linux or GNU Mach). The
       kernel,  in  turn,  initializes  the  rest of the operating system (for
       example, a GNU [Ed. note: or Solaris] system).


       GNU GRUB is a very powerful boot loader that can load a wide variety of
       free  as well as proprietary operating systems with chain-loading. GRUB
       is designed to address the complexity of booting a  personal  computer;
       both  the  program  and  this manual are tightly bound to that computer
       platform, although porting to other platforms may be addressed  in  the
       future. Note: Oracle has ported GRUB to the Solaris operating system.


       One  of the important features in GRUB is flexibility; GRUB understands
       filesystems and kernel executable formats, so you can load an arbitrary
       operating system the way you like, without recording the physical posi‐
       tion of your kernel on the disk. Thus you can load the kernel  just  by
       specifying  its  file name and the drive and partition where the kernel
       resides.


       Among Solaris machines, GRUB is supported on x86  platforms.  The  GRUB
       software  that  is shipped with Solaris adds one utility not present in
       the open-source distribution:

       bootadm(8)  Enables you to manage the boot archive and make changes  to
                   the GRUB menu.



       Beyond this Solaris-specific utility, the GRUB software is described in
       the GRUB manual, a PDF version of which is available  from  the  Oracle
       website.


       Most  administrators  will not need to manually execute the GRUB utili‐
       ties   (which    can    be    found    in    /usr/lib/grub2/bios    and
       /usr/lib/grub2/uefi64  for  systems  with BIOS firmware and 64-bit UEFI
       firmware, respectively), as bootadm(8) provides an interface to modify‐
       ing the GRUB menu.


       Administrators  should  not  manually edit the GRUB configuration file,
       grub.cfg, which can be found in the /boot/grub subdirectory of the top-
       level   ZFS   dataset   for   the   system's   root   pool   (that  is,
       /rpool/boot/grub). This  file  is  automatically  regenerated  when  an
       administrator  changes the boot configuration with bootadm(8). Advanced
       administrators who want to directly create GRUB menu entries must  edit
       the  supplemental  GRUB  configuration  file named custom.cfg, which is
       stored in the same directory as the  grub.cfg  file.  Note  that  on  a
       freshly-installed  system, this file will not be present, so the admin‐
       istrator will need to create it.

SEE ALSO
       boot(8), bootadm(8)


       Automatically Installing Oracle Solaris 11.4 Systems


       Booting and Shutting Down Oracle Solaris 11.4 Systems


       https://www.gnu.org/software/grub/

NOTES
       Previous versions of Solaris have documented the use of the installgrub
       command for installing the GRUB boot loader. This command is deprecated
       and is present ONLY for convenience, disaster recovery, and downgrading
       back  to  a Solaris boot environment in which GRUB Legacy is the system
       boot loader. Please  consult  the  Booting  and  Shutting  Down  Oracle
       Solaris 11.4 Systems documentation for further details.



Oracle Solaris 11.4               11 May 2021                          grub(7)
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