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

["Andreas Färber" <afaerber@suse.de>]

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

-- 
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg