mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
ec36ba1474
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3175 c046a42c-6fe2-441c-8c8c-71466251a162
132 lines
4.2 KiB
Text
132 lines
4.2 KiB
Text
@example
|
|
@c man begin SYNOPSIS
|
|
usage: qemu-img command [command options]
|
|
@c man end
|
|
@end example
|
|
|
|
@c man begin OPTIONS
|
|
|
|
The following commands are supported:
|
|
@table @option
|
|
@item create [-e] [-6] [-b @var{base_image}] [-f @var{fmt}] @var{filename} [@var{size}]
|
|
@item commit [-f @var{fmt}] @var{filename}
|
|
@item convert [-c] [-e] [-6] [-f @var{fmt}] @var{filename} [-O @var{output_fmt}] @var{output_filename}
|
|
@item info [-f @var{fmt}] @var{filename}
|
|
@end table
|
|
|
|
Command parameters:
|
|
@table @var
|
|
@item filename
|
|
is a disk image filename
|
|
@item base_image
|
|
is the read-only disk image which is used as base for a copy on
|
|
write image; the copy on write image only stores the modified data
|
|
|
|
@item fmt
|
|
is the disk image format. It is guessed automatically in most cases. The following formats are supported:
|
|
|
|
@table @code
|
|
@item raw
|
|
|
|
Raw disk image format (default). This format has the advantage of
|
|
being simple and easily exportable to all other emulators. If your
|
|
file system supports @emph{holes} (for example in ext2 or ext3 on
|
|
Linux or NTFS on Windows), then only the written sectors will reserve
|
|
space. Use @code{qemu-img info} to know the real size used by the
|
|
image or @code{ls -ls} on Unix/Linux.
|
|
|
|
@item qcow2
|
|
QEMU image format, the most versatile format. Use it to have smaller
|
|
images (useful if your filesystem does not supports holes, for example
|
|
on Windows), optional AES encryption, zlib based compression and
|
|
support of multiple VM snapshots.
|
|
@item qcow
|
|
Old QEMU image format. Left for compatibility.
|
|
@item cow
|
|
User Mode Linux Copy On Write image format. Used to be the only growable
|
|
image format in QEMU. It is supported only for compatibility with
|
|
previous versions. It does not work on win32.
|
|
@item vmdk
|
|
VMware 3 and 4 compatible image format.
|
|
@item cloop
|
|
Linux Compressed Loop image, useful only to reuse directly compressed
|
|
CD-ROM images present for example in the Knoppix CD-ROMs.
|
|
@end table
|
|
|
|
@item size
|
|
is the disk image size in kilobytes. Optional suffixes @code{M}
|
|
(megabyte) and @code{G} (gigabyte) are supported
|
|
|
|
@item output_filename
|
|
is the destination disk image filename
|
|
|
|
@item output_fmt
|
|
is the destination format
|
|
|
|
@item -c
|
|
indicates that target image must be compressed (qcow format only)
|
|
@item -e
|
|
indicates that the target image must be encrypted (qcow format only)
|
|
@item -6
|
|
indicates that the target image must use compatibility level 6 (vmdk format only)
|
|
@end table
|
|
|
|
Command description:
|
|
|
|
@table @option
|
|
@item create [-6] [-e] [-b @var{base_image}] [-f @var{fmt}] @var{filename} [@var{size}]
|
|
|
|
Create the new disk image @var{filename} of size @var{size} and format
|
|
@var{fmt}.
|
|
|
|
If @var{base_image} is specified, then the image will record only the
|
|
differences from @var{base_image}. No size needs to be specified in
|
|
this case. @var{base_image} will never be modified unless you use the
|
|
@code{commit} monitor command.
|
|
|
|
@item commit [-f @var{fmt}] @var{filename}
|
|
|
|
Commit the changes recorded in @var{filename} in its base image.
|
|
|
|
@item convert [-c] [-e] [-f @var{fmt}] @var{filename} [-O @var{output_fmt}] @var{output_filename}
|
|
|
|
Convert the disk image @var{filename} to disk image @var{output_filename}
|
|
using format @var{output_fmt}. It can be optionally encrypted
|
|
(@code{-e} option) or compressed (@code{-c} option).
|
|
|
|
Only the format @code{qcow} supports encryption or compression. The
|
|
compression is read-only. It means that if a compressed sector is
|
|
rewritten, then it is rewritten as uncompressed data.
|
|
|
|
Encryption uses the AES format which is very secure (128 bit keys). Use
|
|
a long password (16 characters) to get maximum protection.
|
|
|
|
Image conversion is also useful to get smaller image when using a
|
|
growable format such as @code{qcow} or @code{cow}: the empty sectors
|
|
are detected and suppressed from the destination image.
|
|
|
|
@item info [-f @var{fmt}] @var{filename}
|
|
|
|
Give information about the disk image @var{filename}. Use it in
|
|
particular to know the size reserved on disk which can be different
|
|
from the displayed size. If VM snapshots are stored in the disk image,
|
|
they are displayed too.
|
|
@end table
|
|
|
|
@c man end
|
|
|
|
@ignore
|
|
|
|
@setfilename qemu-img
|
|
@settitle QEMU disk image utility
|
|
|
|
@c man begin SEEALSO
|
|
The HTML documentation of QEMU for more precise information and Linux
|
|
user mode emulator invocation.
|
|
@c man end
|
|
|
|
@c man begin AUTHOR
|
|
Fabrice Bellard
|
|
@c man end
|
|
|
|
@end ignore
|