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Date: Fri, 25 Jul 2014 15:20:17 +0200
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Subject: Re: [Qemu-devel] [questions] about qemu log
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To: Zhang Haoyu <zhanghy@sangfor.com>
Cc: =?UTF-8?B?QWxleCBCZW5uw6ll?= <alex.bennee@linaro.org>, qemu-devel <qemu-devel@nongnu.org>

Am 25.07.2014 13:07, schrieb Zhang Haoyu:
>>> Hi, all
>>>
>>> If I use qemu command directly to run vm, bypass libvirt, how to conf=
igure qemu to assure that each vm has its own log file, like vmname.log?
>>> For example, VM: rhel7-net has its own log file, rhel7-net.log,
>>> VM:rhel7-stor has its own log file, rhel7-stor.log.
>>
>> -D /path/to/unique/file/name.log
>>
> -D option is to configure qemu_logfile for the output logs which are co=
ntrolled by qmp command "logfile", which can be enabled/disabled on run t=
ime.
>=20
> I want to configure the log file for the output of fprintf(stderr, fmt,=
 ...), .etc,
> i.e., how to redirect the output of fprintf(stderr, fmt, ...), or some =
other log-interface to a specified file?

In a shell you would write something like:

2> stderr.log

You may also want to toggle QEMU's -msg timestamp=3Don option.

Cheers,
Andreas

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