[libvirt] specifying -serial telnet: in XML

Sukadev Bhattiprolu sukadev at linux.vnet.ibm.com
Thu Apr 2 05:13:53 UTC 2009

I run qemu (version 0.9.1 kvm-84) with -serial option as follows:

	- serial telnet::2445,server

so I can telnet to 2445 and have a serial console.

I tried specifying this to libvirt (version 0.6.0) using the following stanza:

    <serial type='tcp'>
      <source mode="bind" host="" service="2445"/>
      <protocol type="telnet"/>
      <target port="1"/>

I checked /var/log/libvirt/qemu/<guest>.log  and found that libvirt
added 'nowait' to the serial option:

	-serial telnet:,server,nowait

which is fine (I think).

But when I start my guest, and "telnet 2445" I don't get any
output even though the guest boots up fine. After the guest boots

	$ echo foo > /dev/ttyS0

in the guest shows the 'foo' in the telnet window. But I don't get the
boot/shutdown messages.

I also have the vnc option in the xml,

	  <graphics type='vnc' port='5902' autoport='no' listen=''/>

so if I open vncviewer, I can see the boot messages. The problem with this
though is if the kernel fails to boot for some reason, the vncviewer exits
and I can't find the reason the boot failed.

My kernel boot command line has 'console=ttyS0' option.  Is there anything
else I need to ensure 'telnet port' displays the messages ? 



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