CentOS virt - Apr 2011 - Extract ip address from a kvm guest

Hi all,

  Somebody knows how can I extract/know an ip address used by a kvm 
guest using a script?? For example I have the following guests:

[root at kvmsrv01 bin]# virsh list --all
  Id Name                 State
----------------------------------
   1 linclunode01         running
   2 linmgmt              running
   5 win7desktop          running


  I know that linclunode01 has 172.25.50.1 as ip address, linmgmt has 
172.25.50.2 and so on. But suppose that i don't know which ip address is 
used by win7desktop guest. The real fqdn for win7desktop is 
win7.local.net. How can I know its real ip using a script (bash, python, 
etc)?? I don't use a dhcp or dns server on this network.

  Thanks.

-- 
CL Martinez
carlopmart {at} gmail {d0t} com

--- On Sat, 4/23/11, carlopmart <carlopmart at gmail.com> wrote:
> From: carlopmart <carlopmart at gmail.com>
> Subject: [CentOS-virt] Extract ip address from a kvm guest
> To: centos-virt at centos.org
> Date: Saturday, April 23, 2011, 8:07 AM
> Hi all,
> 
> ? Somebody knows how can I extract/know an ip address
> used by a kvm 
> guest using a script?? For example I have the following
> guests:
> 
> [root at kvmsrv01 bin]# virsh list --all
> ? Id Name? ? ? ? ? ?
> ? ???State
> ----------------------------------
> ???1 linclunode01? ? ?
> ???running
> ???2 linmgmt? ? ? ?
> ? ? ? running
> ???5 win7desktop? ? ? ?
> ? running
> 
> 
> ? I know that linclunode01 has 172.25.50.1 as ip
> address, linmgmt has 
> 172.25.50.2 and so on. But suppose that i don't know which
> ip address is 
> used by win7desktop guest. The real fqdn for win7desktop is
> 
> win7.local.net. How can I know its real ip using a script
> (bash, python, 
> etc)?? I don't use a dhcp or dns server on this network.
If you have an http server on the local network:

Inside the VM guest:

------------ /etc/rc.local ------------
wget --spider http://192.168.1.1/favicon.ico?sl6bs?ga-p45
------------ snip ---------

where the web server is at 192.168.1.1, Virt host is ga-p45, and the VM guest is
sl6bs.

In the server logs I see:
$ sudo tail -n 175 /var/log/apache2/local_log | grep fav
192.168.1.224 - - [23/Apr/2011:10:10:02 -0700] "HEAD
/favicon.ico?lucidpv?ga-p45 HTTP/1.0" 200 296
192.168.1.155 - - [23/Apr/2011:10:10:10 -0700] "HEAD
/favicon.ico?centbs?ga-p45 HTTP/1.0" 200 296
192.168.1.183 - - [23/Apr/2011:10:10:10 -0700] "HEAD
/favicon.ico?sl6bs?ga-p45 HTTP/1.0" 200 296


-- 
Mark

See
http://rwmj.wordpress.com/2010/10/26/tip-find-the-ip-address-of-a-virtua
l-machine/

There is also a later post on this blog


---
jlm