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