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.\" ========================================================================
.\"
.IX Title "virt-log 1"
.TH virt-log 1 "2021-03-31" "libguestfs-1.44.2" "Virtualization Support"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "名前"
.IX Header "名前"
virt-log \- Display log files from a virtual machine
.SH "書式"
.IX Header "書式"
.Vb 1
\& virt\-log [\-\-options] \-d domname
\&
\& virt\-log [\-\-options] \-a disk.img [\-a disk.img ...]
.Ve
.SH "説明"
.IX Header "説明"
\&\f(CW\*(C`virt\-log\*(C'\fR is a command line tool to display the log files from the named
virtual machine (or disk image).
.PP
This tool understands and displays both plain text log files
(eg. \fI/var/log/messages\fR) and binary formats such as the systemd journal.
.PP
To display other types of files, use \fBvirt\-cat\fR\|(1).  To follow (tail)  text
log files, use \fBvirt\-tail\fR\|(1).  To copy files out of a virtual machine, use
\&\fBvirt\-copy\-out\fR\|(1).  To display the contents of the Windows Registry, use
\&\fBvirt\-win\-reg\fR\|(1).
.SH "例"
.IX Header "例"
Display the complete logs from a guest:
.PP
.Vb 1
\& virt\-log \-d mydomain | less
.Ve
.PP
仮想マシンが取得している \s-1DHCP IP\s0 アドレスを発見するには:
.PP
.Vb 1
\& virt\-log \-d mydomain | grep \*(Aqdhclient.*bound to\*(Aq
.Ve
.SH "オプション"
.IX Header "オプション"
.IP "\fB\-\-help\fR" 4
.IX Item "--help"
簡単なヘルプを表示します。
.IP "\fB\-a\fR file" 4
.IX Item "-a file"
.PD 0
.IP "\fB\-\-add\fR file" 4
.IX Item "--add file"
.PD
Add \fIfile\fR which should be a disk image from a virtual machine.  If the
virtual machine has multiple block devices, you must supply all of them with
separate \fI\-a\fR options.
.Sp
ディスクイメージの形式は自動検知されます。 これを上書きして強制的に特定の形式を使用する場合、 \fI\-\-format=..\fR オプションを使用します。
.IP "\fB\-a \s-1URI\s0\fR" 4
.IX Item "-a URI"
.PD 0
.IP "\fB\-\-add \s-1URI\s0\fR" 4
.IX Item "--add URI"
.PD
リモートディスクを追加します。 \*(L"リモートストレージの追加\*(R" in \fBguestfish\fR\|(1) 参照。
.IP "\fB\-\-blocksize=512\fR" 4
.IX Item "--blocksize=512"
.PD 0
.IP "\fB\-\-blocksize=4096\fR" 4
.IX Item "--blocksize=4096"
.IP "\fB\-\-blocksize\fR" 4
.IX Item "--blocksize"
.PD
This parameter sets the sector size of the disk image.  It affects all
explicitly added subsequent disks after this parameter.  Using
\&\fI\-\-blocksize\fR with no argument switches the disk sector size to the default
value which is usually 512 bytes.  See also
\&\*(L"guestfs_add_drive_opts\*(R" in \fBguestfs\fR\|(3).
.IP "\fB\-c\fR \s-1URI\s0" 4
.IX Item "-c URI"
.PD 0
.IP "\fB\-\-connect\fR \s-1URI\s0" 4
.IX Item "--connect URI"
.PD
libvirt を使用していると、指定された \fI\s-1URI\s0\fR に接続します。  省略すると、デフォルトの libvirt ハイパーバイザーに接続します。
.Sp
ゲストのブロックデバイスを直接指定していると（(\fI\-a\fR)）、libvirt は何も使用されません。
.IP "\fB\-d\fR guest" 4
.IX Item "-d guest"
.PD 0
.IP "\fB\-\-domain\fR guest" 4
.IX Item "--domain guest"
.PD
名前付きの libvirt 仮想マシンからすべてのディスクを追加します。  名前の代わりに仮想マシンの \s-1UUID\s0 を使用できます。
.IP "\fB\-\-echo\-keys\fR" 4
.IX Item "--echo-keys"
When prompting for keys and passphrases, virt-log normally turns echoing off
so you cannot see what you are typing.  If you are not worried about Tempest
attacks and there is no one else in the room you can specify this flag to
see what you are typing.
.IP "\fB\-\-format=raw|qcow2|..\fR" 4
.IX Item "--format=raw|qcow2|.."
.PD 0
.IP "\fB\-\-format\fR" 4
.IX Item "--format"
.PD
\&\fI\-a\fR オプションは標準状態でディスクイメージの形式を自動検知します。 これを使用することにより、コマンドラインで後続の \fI\-a\fR
オプションのディスク形式を強制的に指定できます。 引数なしで \fI\-\-format\fR を使用することにより、 後続の \fI\-a\fR
オプションに対して自動検知に戻せます。
.Sp
例:
.Sp
.Vb 1
\& virt\-log \-\-format=raw \-a disk.img
.Ve
.Sp
forces raw format (no auto-detection) for \fIdisk.img\fR.
.Sp
.Vb 1
\& virt\-log \-\-format=raw \-a disk.img \-\-format \-a another.img
.Ve
.Sp
forces raw format (no auto-detection) for \fIdisk.img\fR and reverts to
auto-detection for \fIanother.img\fR.
.Sp
仮想マシンのディスクイメージが信頼できない raw 形式である場合、 ディスク形式を指定するためにこのオプションを使用すべきです。
これにより、悪意のある仮想マシンにより起こり得る セキュリティ問題を回避できます (\s-1CVE\-2010\-3851\s0)。
.IP "\fB\-\-key\fR \s-1SELECTOR\s0" 4
.IX Item "--key SELECTOR"
Specify a key for \s-1LUKS,\s0 to automatically open a \s-1LUKS\s0 device when using the
inspection.  \f(CW\*(C`ID\*(C'\fR can be either the libguestfs device name, or the \s-1UUID\s0 of
the \s-1LUKS\s0 device.
.RS 4
.ie n .IP "\fB\-\-key\fR ""ID"":key:KEY_STRING" 4
.el .IP "\fB\-\-key\fR \f(CWID\fR:key:KEY_STRING" 4
.IX Item "--key ID:key:KEY_STRING"
Use the specified \f(CW\*(C`KEY_STRING\*(C'\fR as passphrase.
.ie n .IP "\fB\-\-key\fR ""ID"":file:FILENAME" 4
.el .IP "\fB\-\-key\fR \f(CWID\fR:file:FILENAME" 4
.IX Item "--key ID:file:FILENAME"
Read the passphrase from \fI\s-1FILENAME\s0\fR.
.RE
.RS 4
.RE
.IP "\fB\-\-keys\-from\-stdin\fR" 4
.IX Item "--keys-from-stdin"
Read key or passphrase parameters from stdin.  The default is to try to read
passphrases from the user by opening \fI/dev/tty\fR.
.Sp
If there are multiple encrypted devices then you may need to supply multiple
keys on stdin, one per line.
.IP "\fB\-v\fR" 4
.IX Item "-v"
.PD 0
.IP "\fB\-\-verbose\fR" 4
.IX Item "--verbose"
.PD
デバッグ用の冗長なメッセージを有効にします。
.IP "\fB\-V\fR" 4
.IX Item "-V"
.PD 0
.IP "\fB\-\-version\fR" 4
.IX Item "--version"
.PD
バージョン番号を表示して、終了します。
.IP "\fB\-x\fR" 4
.IX Item "-x"
libguestfs \s-1API\s0 呼び出しのトレースを有効にします。
.SH "終了ステータス"
.IX Header "終了ステータス"
このプログラムは、成功すると 0 を、エラーがあると 0 以外を返します。
.SH "関連項目"
.IX Header "関連項目"
\&\fBguestfs\fR\|(3), \fBguestfish\fR\|(1), \fBvirt\-cat\fR\|(1), \fBvirt\-copy\-out\fR\|(1),
\&\fBvirt\-tail\fR\|(1), \fBvirt\-tar\-out\fR\|(1), \fBvirt\-win\-reg\fR\|(1),
http://libguestfs.org/.
.SH "著者"
.IX Header "著者"
Richard W.M. Jones http://people.redhat.com/~rjones/
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (C) 2010\-2020 Red Hat Inc.
.SH "LICENSE"
.IX Header "LICENSE"
.SH "BUGS"
.IX Header "BUGS"
To get a list of bugs against libguestfs, use this link:
https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
.PP
To report a new bug against libguestfs, use this link:
https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
.PP
When reporting a bug, please supply:
.IP "\(bu" 4
The version of libguestfs.
.IP "\(bu" 4
Where you got libguestfs (eg. which Linux distro, compiled from source, etc)
.IP "\(bu" 4
Describe the bug accurately and give a way to reproduce it.
.IP "\(bu" 4
Run \fBlibguestfs\-test\-tool\fR\|(1) and paste the \fBcomplete, unedited\fR
output into the bug report.