[libvirt-users] virsh console logging and pty usage

Alex Jia ajia at redhat.com
Wed May 9 02:43:16 UTC 2012

Hi Doug,

Replace your console type from 'file' to 'pty' it looks like this:
<serial type='pty'>
  <target port='0'/>
<console type='pty'>
  <target port='0'/>

And then append the parameter "console=ttyS0,115200" to guest kernel 
cmdline and reboot your guest, to use virsh console to connect your
guest again.

For details, please refer to the following link:

Good Luck!

----- Original Message -----
From: "Doug Goldstein" <cardoe at gentoo.org>
To: libvirt-users at redhat.com
Sent: Wednesday, May 9, 2012 6:03:57 AM
Subject: [libvirt-users] virsh console logging and pty usage

Is it possible to both log the serial console and to actually use it?
A few of the VMs I've got are configured as follows:

    <serial type='file'>
      <source path='/var/log/libvirt/qemu/serial/bb-2.6.18-128.el5-x86_64.log'/>
      <target port='0'/>
    <console type='file'>
      <source path='/var/log/libvirt/qemu/serial/bb-2.6.18-128.el5-x86_64.log'/>
      <target type='serial' port='0'/>

Because people are hoping to capture the logs after the fact to see if
there was any console output which could help them debug an issue.
However, if you need to connect to the console of the VM its
impossible (e.g. it needs the root password for a fsck).

Any suggestions to allow logging but allow it to be usable via "virsh
console" as well?

Doug Goldstein

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