[libvirt-users] redirecting guest stdio to the host
Dear Friends,
I would ask you a question ; grateful in advance!
I have a program running on a VM guest. Its output is valuable (for VM introspection) so I
want to let the host module know about it. I prefer to redirect ' stdio" of a
guest into a device at the host (a text file or my device that has the name
"mydev"
and the driver is written for it).
I have the XML definition file for my VM in /etc/libvirt/qemu. I have added the section:
<serial type="file">
<source path="/var/log/vm/vml.log"/>
<target port="0"/>
</serial>
into the /devices section.
That is I want the stdio to be streamed into the file /var/log/vm/vml.log at the host.
Then I run simple textual commands at the guest (ls, pwd and so on). But I do not see
/var/log/vm/vml.log created at the host.
Please help me.
Thanks in advance,
Alexander Binun
The command string for qemu will look like qemu -serial /dev/mydev ... But I would like
to
modify the libvirt definition XML file (in /etc/libvirt/qemu). Stefan notes in his blog
(http://blog.vmsplice.net/2011/04/how-to-pass-qemu-command-line-options.html) that the
options will
look like:
---------- Forwarded message ----------
Date: Wed, 28 May 2014 18:06:10 +0300
From: Eric Blake <eblake(a)redhat.com>
To: Alexander Binun <binun(a)cs.bgu.ac.il>
Cc: Stefan Hajnoczi <stefanha(a)gmail.com>
yagel(a)cs.bgu.ac.il
kahilm(a)post.bgu.ac.il
qemu-devel(a)nongnu.org
boaz.menuhin(a)gmail.com
Paolo Bonzini <pbonzini(a)redhat.com>
markbl(a)post.bgu.ac.il
Subject: Re: excuse me for incorrect question...
On 05/28/2014 08:43 AM, Alexander Binun wrote:
Eric, I aplogize for making your work complicated.
[You top-posted again]
No need to apologize - these lists exist to help people, and we were all
new once.
Should I send questions to libvirt-users(a)redhat.com instead ? I would ask more questions.
Yes, if your questions are related to libvirt, then asking on a libvirt
list will get you a better audience that may have better answers to your
questions.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
On 05/28/2014 08:43 AM, Alexander Binun wrote:
Eric, I aplogize for making your work complicated.
[You top-posted again]
No need to apologize - these lists exist to help people, and we were all
new once.
Should I send questions to libvirt-users(a)redhat.com instead ? I would ask more
questions.
Yes, if your questions are related to libvirt, then asking on a libvirt
list will get you a better audience that may have better answers to your
questions.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org