mkrescue

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



NAME
       mkrescue - make rescue floppy or CD


SYNOPSIS
       /sbin/mkrescue makes a bootable rescue floppy or CD using the default
       kernel specified in lilo.conf.


DESCRIPTION
       mkrescue takes its specifation for the kernel from the default image
       specified in /etc/lilo.conf.  If the actual default is an other=
       specification, then use the first image= specification.  Any associated
       initial ramdisk (initrd=), and append= options will also be used.  The
       root directory will be taken to be the current root.  A bootable floppy
       or CD-image will be created using LILO version 22.5.5 or later.
       mkrescue normally requires no options, unless a CD-image is desired
       (--iso).


OPTIONS
       --append <string>
              Override any append= options taken from the default image.  If
              there is any doubt about whether the lilo.conf options are
              correct, then specify no kernel parameters by providing the null
              string (--append "").


       --debug
              Provide verbose output of the operation of mkrescue, pausing to
              allow the setting of internal operating parameters to be viewed.
              <CR> must be hit to proceed from these pauses.


       --device <device>
              Make the floppy on a device other than /dev/fd0.  The floppy
              disk will always be made to boot on BIOS device code 0x00 (A:
              drive), without regard to the drive on which it is created.


       --fast Use a faster method of creating the boot floppy.  This involves
              first creating a file of --size 1k blocks (default is 1440)
              mounted using a loopback device, creating the bootable floppy,
              then copying the entire file to the disk.


       --fs [ ext2 | msdos | minix ]
              Specify the type of filesystem to create on the drive.  ext2 is
              the default, but msdos and minix allow slightly more disk
              sectors for really big kernels.


       --help Print a short usage synopsis, including a list of command
              options.


       --image <label>
              Specifies the label or alias of the particular image from which
              the append, initial ramdisk, root, keytable, and kernel
              information is to be taken.


       --initrd <filepath> and --kernel <filepath>
              These options, which must be used together, allow specification
              of an arbitrary kernel file and initial ramdisk file to be used
              on the created boot floppy.  Be sure you know what you are doing
              before you use these options.  If no inital ramdisk is needed
              with a particular kernel, then you MUST specify --initrd "",
              meaning a null pathname.


       --install [ text | menu ]
              Allows overriding the default human interface used with the
              rescue bootloader (configuration file "install=" option). text
              is the default on 1.2MB and 1.44MB floppy disks, and menu is the
              default on 2.88MB floppies and HD emulation on CD-R media.


       --iso  Create an ISO-9660 bootable CD image (El Torito Format) suitable
              for burning to a CD-R or CD-RW.  The --device specification
              defaults to the filename rescue.iso, and the --size defaults to
              2880.  A utility such as "wodim" may be used to burn the ISO
              file to a recordable CD medium.  With this ISO option, the
              --size HD option is allowed.


       --nocompact
              For faster kernel loading from a floppy, LILO map compaction is
              normally enabled.  This option will disable map compaction by
              omitting the lilo -c switch.


       --noformat
              Suppresses creation of a new filesystem on the boot floppy.
              This option may be used ONLY when you know that the floppy you
              will be writing upon is formatted with the same filesystem as
              specified by --fs XXX (default is ext2).


       --root <device>
              Specify the root filesystem for the kernel on the boot floppy.
              The currently mounted root is taken as the default
              specification.


       --size [ 1440 | 1200 | 2880 | HD ]
              The default floppy disk size is 1440, meaning a 1.44MB floppy.
              When --iso is specified, the default size is 2880.  Allowed
              specifications are 1200, 1440, or 2880, meaning a 1.2MB, 1.44MB
              or 2.88MB floppy, respectively.  No other floppy disk sizes are
              supported.

              The HD specification, meaning "hard disk", may only be used with
              the --iso option, to indicate a 16MB hard disk is to be
              generated for emulation.  This allows for very large
              kernel/initial ramdisk combinations on CD-R.  The hard disk
              image is created using loopback devices /dev/loop0 and
              /dev/loop1, which must be free to utilize this size option.


       --version
              Print the version number of mkrescue, then terminate.


SEE ALSO
       cdrecord(1), dd(1), wodim(1), lilo.conf(5), lilo(8), mkfs(8),
       mkinitrd(8), mkisofs(8), mount(8)




                                  6 Mar 2011                       MKRESCUE(8)