redirect qemu-dm log to syslog

redirect qemu-dm log to syslog

[Vasiliy Tolstov]

I'm search mailing list and can't see any questions and answers...
Is that possible (and how) to redirect qemu-dm output (stored in
/var/log/xen/qemu-dm-xxx.log) to syslog and not write to file?

-- 
Vasiliy Tolstov,
Clodo.ru
e-mail: v.tolstov@selfip.ru
jabber: vase@selfip.ru

Re: redirect qemu-dm log to syslog

[Stefano Stabellini]

On Thu, 7 Feb 2013, Vasiliy Tolstov wrote:
> I'm search mailing list and can't see any questions and answers...
> Is that possible (and how) to redirect qemu-dm output (stored in
> /var/log/xen/qemu-dm-xxx.log) to syslog and not write to file?

Not easily, unless you find a way to capture QEMU's stdout and stderr
and send it to syslog using an external tool. You can replace the QEMU
binary with a script that spawns QEMU and a syslog logger to do this.

You can also play nasty tricks with preprocessor macros and turn all
QEMU's printf into syslog calls. Of course such a patch wouldn't be
acceptable upstream.

Re: redirect qemu-dm log to syslog

[Andrew Cooper]

On 08/02/13 11:42, Stefano Stabellini wrote:
> On Thu, 7 Feb 2013, Vasiliy Tolstov wrote:
>> I'm search mailing list and can't see any questions and answers...
>> Is that possible (and how) to redirect qemu-dm output (stored in
>> /var/log/xen/qemu-dm-xxx.log) to syslog and not write to file?
> Not easily, unless you find a way to capture QEMU's stdout and stderr
> and send it to syslog using an external tool. You can replace the QEMU
> binary with a script that spawns QEMU and a syslog logger to do this.
>
> You can also play nasty tricks with preprocessor macros and turn all
> QEMU's printf into syslog calls. Of course such a patch wouldn't be
> acceptable upstream.

This was attempted in XenServer, and is harder than just changing the
printf calls.  In the end we gave up and just wrapped stdout/stderr.

~Andrew

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