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doc update - added qemu-img manual page

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1151 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2004-11-15 22:57:26 +00:00
parent c9c0eae84e
commit acd935ef62
5 changed files with 155 additions and 173 deletions
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2
.cvsignore
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@ -10,6 +10,8 @@ qemu-doc.html
qemu-tech.html
qemu.1
qemu.pod
qemu-img.1
qemu-img.pod
sparc-user
qemu-img
sparc-softmmu

13
Makefile
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@ -14,7 +14,7 @@ TOOLS=qemu-img
ifdef CONFIG_STATIC
LDFLAGS+=-static
endif
DOCS=qemu-doc.html qemu-tech.html qemu.1
DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1
all: dyngen$(EXESUF) $(TOOLS) $(DOCS)
for d in $(TARGET_DIRS); do \
@ -30,7 +30,7 @@ dyngen$(EXESUF): dyngen.c
clean:
# avoid old build problems by removing potentially incorrect old files
rm -f config.mak config.h op-i386.h opc-i386.h gen-op-i386.h op-arm.h opc-arm.h gen-op-arm.h
rm -f *.o *.a $(TOOLS) dyngen$(EXESUF) TAGS qemu.pod *~ */*~
rm -f *.o *.a $(TOOLS) dyngen$(EXESUF) TAGS *.pod *~ */*~
$(MAKE) -C tests clean
for d in $(TARGET_DIRS); do \
$(MAKE) -C $$d $@ || exit 1 ; \
@ -57,7 +57,7 @@ endif
install -m 644 qemu-doc.html qemu-tech.html "$(docdir)"
ifndef CONFIG_WIN32
mkdir -p "$(mandir)/man1"
install qemu.1 qemu-mkcow.1 "$(mandir)/man1"
install qemu.1 qemu-img.1 "$(mandir)/man1"
endif
for d in $(TARGET_DIRS); do \
$(MAKE) -C $$d $@ || exit 1 ; \
@ -78,6 +78,10 @@ qemu.1: qemu-doc.texi
./texi2pod.pl $< qemu.pod
pod2man --section=1 --center=" " --release=" " qemu.pod > $@
qemu-img.1: qemu-img.texi
./texi2pod.pl $< qemu-img.pod
pod2man --section=1 --center=" " --release=" " qemu-img.pod > $@
FILE=qemu-$(shell cat VERSION)
# tar release (use 'make -k tar' on a checkouted tree)
@ -92,6 +96,7 @@ tarbin:
( cd / ; tar zcvf ~/qemu-$(VERSION)-i386.tar.gz \
$(bindir)/qemu $(bindir)/qemu-fast \
$(bindir)/qemu-system-ppc \
$(bindir)/qemu-system-sparc \
$(bindir)/qemu-i386 \
$(bindir)/qemu-arm \
$(bindir)/qemu-sparc \
@ -105,7 +110,7 @@ tarbin:
$(datadir)/linux_boot.bin \
$(docdir)/qemu-doc.html \
$(docdir)/qemu-tech.html \
$(mandir)/man1/qemu.1 $(mandir)/man1/qemu-mkcow.1 )
$(mandir)/man1/qemu.1 $(mandir)/man1/qemu-img.1 )
ifneq ($(wildcard .depend),)
include .depend

81
qemu-doc.texi
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@ -584,81 +584,34 @@ CPU registers by prefixing them with @emph{$}.
@node disk_images
@section Disk Images
@subsection Raw disk images
Since version 0.6.1, QEMU supports many disk image formats, including
growable disk images (their size increase as non empty sectors are
written), compressed and encrypted disk images.
The disk images can simply be raw images of the hard disk. You can
create them with the command:
@subsection Quick start for disk image creation
You can create a disk image with the command:
@example
dd of=myimage bs=1024 seek=mysize count=0
qemu-img create myimage.img mysize
@end example
where @var{myimage} is the image filename and @var{mysize} is its size
in kilobytes.
where @var{myimage.img} is the disk image filename and @var{mysize} is its
size in kilobytes. You can add an @code{M} suffix to give the size in
megabytes and a @code{G} suffix for gigabytes.
@xref{qemu_img_invocation} for more information.
@subsection Snapshot mode
If you use the option @option{-snapshot}, all disk images are
considered as read only. When sectors in written, they are written in
a temporary file created in @file{/tmp}. You can however force the
write back to the raw disk images by pressing @key{C-a s}.
write back to the raw disk images by using the @code{commit} monitor
command (or @key{C-a s} in the serial console).
NOTE: The snapshot mode only works with raw disk images.
@node qemu_img_invocation
@subsection @code{qemu-img} Invocation
@subsection Copy On Write disk images
QEMU also supports user mode Linux
(@url{http://user-mode-linux.sourceforge.net/}) Copy On Write (COW)
disk images. The COW disk images are much smaller than normal images
as they store only modified sectors. They also permit the use of the
same disk image template for many users.
To create a COW disk images, use the command:
@example
qemu-mkcow -f myrawimage.bin mycowimage.cow
@end example
@file{myrawimage.bin} is a raw image you want to use as original disk
image. It will never be written to.
@file{mycowimage.cow} is the COW disk image which is created by
@code{qemu-mkcow}. You can use it directly with the @option{-hdx}
options. You must not modify the original raw disk image if you use
COW images, as COW images only store the modified sectors from the raw
disk image. QEMU stores the original raw disk image name and its
modified time in the COW disk image so that chances of mistakes are
reduced.
If the raw disk image is not read-only, by pressing @key{C-a s} you
can flush the COW disk image back into the raw disk image, as in
snapshot mode.
COW disk images can also be created without a corresponding raw disk
image. It is useful to have a big initial virtual disk image without
using much disk space. Use:
@example
qemu-mkcow mycowimage.cow 1024
@end example
to create a 1 gigabyte empty COW disk image.
NOTES:
@enumerate
@item
COW disk images must be created on file systems supporting
@emph{holes} such as ext2 or ext3.
@item
Since holes are used, the displayed size of the COW disk image is not
the real one. To know it, use the @code{ls -ls} command.
@end enumerate
@subsection Convert VMware disk images to raw disk images
You can use the tool @file{vmdk2raw} to convert VMware disk images to
raw disk images directly usable by QEMU. The syntax is:
@example
vmdk2raw vmware_image output_image
@end example
@include qemu-img.texi
@section Network emulation

127
qemu-img.texi Normal file
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@ -0,0 +1,127 @@
@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] [-b @var{base_image}] [-f @var{fmt}] @var{filename} [@var{size}]
@item commit [-f @var{fmt}] @var{filename}
@item convert [-c] [-e] [-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),
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 qcow
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 and zlib based compression.
@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. Currently only supported as
read-only.
@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)
@end table
Command description:
@table @option
@item create [-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 optionnaly 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.
@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

105
qemu-mkcow.1
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@ -1,105 +0,0 @@
.\" $Header: /home/paul/qemu/svnmerge/qemu-cvs/qemu/qemu-mkcow.1,v 1.1 2004-03-26 22:42:54 bellard Exp $
.\"
.\" transcript compatibility for postscript use.
.\"
.\" synopsis: .P! <file.ps>
.\"
.de P!
.fl
\!!1 setgray
.fl
\\&.\"
.fl
\!!0 setgray
.fl \" force out current output buffer
\!!save /psv exch def currentpoint translate 0 0 moveto
\!!/showpage{}def
.fl \" prolog
.sy sed -e 's/^/!/' \\$1\" bring in postscript file
\!!psv restore
.
.de pF
.ie \\*(f1 .ds f1 \\n(.f
.el .ie \\*(f2 .ds f2 \\n(.f
.el .ie \\*(f3 .ds f3 \\n(.f
.el .ie \\*(f4 .ds f4 \\n(.f
.el .tm ? font overflow
.ft \\$1
..
.de fP
.ie !\\*(f4 \{\
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' br \}
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' br \}
.el .tm ? font underflow
..
.ds f1\"
.ds f2\"
.ds f3\"
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'\" t
.ta 8n 16n 24n 32n 40n 48n 56n 64n 72n
.TH "QEMU" "8"
.SH "NAME"
qemu-mkcow \(em create a copy-on-write file for qemu
.SH "SYNOPSIS"
.PP
\fBqemu-mkcow\fR [\fB-h\fP] [\fB-f \fImaster_disk_image\fR\fP] [\fIcow_image\fR] [\fB\fIcow_size\fR\fP]
.SH "DESCRIPTION"
.PP
The \fBqemu-mkcow\fR command creates a
persistent copy-on-write file for \fBqemu\fR.
.PP
\fBqemu\fR can be used in a "copy-on-write" mode,
where changes made by \fBqemu\fR do not actually
change the disk image file. One way is to invoke
\fBqemu\fR with -snapshot: these changes
are stored in a temporary file, which is discarded when
\fBqemu\fR exits.
.PP
\fBqemu-mkcow\fR creates an explicit copy-on-write
file where changes are to be stored: this way, changes made
inside \fBqemu\fR will still be there next time you
run it, although the master disk image isn't ever changed.
.PP
The usual method is to create the master image, then create a
copy-on-write file using \fBqemu-mkcow\fR with
\fB-f\fP. The filename of the master image is stored
inside the generated copy-on-write file: it must not be modified
after this is run!
.PP
If no master file is specified, the effect is that of a
blank master of size \fIcow_size\fR.
.SH "SEE ALSO"
.PP
qemu(1), qemu-fast(1).
.SH "AUTHOR"
.PP
This manual page was written by Paul Russell prussell@debian.org for
the \fBDebian\fP system (but may be used by others). Permission is
granted to copy, distribute and/or modify this document under
the terms of the GNU General Public License, Version 2 any
later version published by the Free Software Foundation.
.PP
On Debian systems, the complete text of the GNU General Public
License can be found in /usr/share/common-licenses/GPL.
.\" created by instant / docbook-to-man, Fri 12 Mar 2004, 05:58