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Re: [Qemu-devel] [questions] about qemu log


From: Andreas Färber
Subject: Re: [Qemu-devel] [questions] about qemu log
Date: Fri, 25 Jul 2014 15:20:17 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

Am 25.07.2014 13:07, schrieb Zhang Haoyu:
>>> Hi, all
>>>
>>> If I use qemu command directly to run vm, bypass libvirt, how to configure 
>>> 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 
> controlled by qmp command "logfile", which can be enabled/disabled on run 
> time.
> 
> 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=on option.

Cheers,
Andreas

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