-> Add a second console device ttyS1
====
[root@host ~(keystone_admin)]$ guestfish --ro -i -d instance-00000008

Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.

Type: 'help' for help on commands
      'man' to read the manual
      'quit' to quit the shell

Operating system: Fedora release 17 (Beefy Miracle)
/dev/vda2 mounted on /

><fs> grep console /etc/grub2.cfg 
        linux   /boot/vmlinuz-3.3.4-5.fc17.x86_64 root=UUID=4b5449df-7e12-4752-aa8d-e6668bd118ec ro rhgb console=tty0 console=ttyS1,115200
><fs> 
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-> From the below XML fragment
	- it can be seen that the first console device (ttyS0) is not using a PTY. It's using a file.
	- the second console device is using a PTY ( /dev/pts/6)
====
[root@host ~(keystone_admin)]$ virsh dumpxml instance-00000008 |  egrep -i 'serial type' -A9
    <serial type='file'>
      <source path='/var/lib/nova/instances/instance-00000008/console.log'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <serial type='pty'>
      <source path='/dev/pts/6'/>
      <target port='1'/>
      <alias name='serial1'/>
    </serial>
    <console type='file'>
      <source path='/var/lib/nova/instances/instance-00000008/console.log'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
[root@host ~(keystone_admin)]$ 
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-> Let's log into the guest, and echo some content into both the console devices
====
[root@guest ~]# echo "port one test" > /dev/ttyS0
[root@guest ~]# echo "port two test" > /dev/ttyS1
[root@guest ~]# 
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-> Next, from the host, cat the first console log, which is a file, & virsh connect to the second serial device -- to see the effect of our tes
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[root@host ~(keystone_admin)]$ cat /var/lib/nova/instances/instance-00000008/console.log 
port one test
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[root@host ~(keystone_admin)]$ virsh console instance-00000008 --devname serial1
Connected to domain instance-00000008
Escape character is ^]
port two test
====