[PVE-User] How to see IP address of guest VM

[Dietmar Maurer]

That waste plenty of CPU power?

> -----Original Message-----
> From: pve-user-bounces at pve.proxmox.com [mailto:pve-user-
> bounces at pve.proxmox.com] On Behalf Of Paul Gray
> Sent: Donnerstag, 14. Juni 2012 12:44
> To: pve-user at pve.proxmox.com
> Subject: Re: [PVE-User] How to see IP address of guest VM
> 
> On 06/14/2012 04:57 AM, Paul Gray wrote:
> > On 06/14/2012 12:42 AM, Jewel Nuruddin wrote:
> >> sorry, I am not a developer, as some other can show IP that's why I
> >> though proxmox also implement the same thing.
> >>
> >
> > I'd suggest that a low-friction way to get the information that you're
> > after is to simply run arpwatch on the bridges to watch for MAC-IP
> > bindings. You could then periodically (or on-demand) pull the output
> > from arpwatch and push it through a grep of the MACs found in the
> > server .conf files.
> >
> 
> Just a quick followup to state that this indeed "works for me" in the sense
> that anything that's on the network gets picked up.
> 
> I describe the process below, which is not "the requested solution," but if
> one were to tweak what I outline below so as to:
>    * Pull the MAC and the IP from the arpwatch output
>    * grep the conf files for a corresponding MAC match. Find the
>      MAC for the IP found in the arpwatch output
>    * lock the corresponding server's conf file
>    * sed or echo
>     "# arpwatch found the IP address ${IPADDR} bound to ${VMNET}"
>      into the conf file (So that it will show up in the comment field
>      in the GUI.
>    * unlock the conf file.
> 
> More details:
> 
> My Proxmox servers are named vm1-vm8  and clustered:
> # Install arpwatch
> root at vm1:~# apt-get install arpwatch
> 
> # Pull all interfaces
> root at vm1:~# for x in $(ifconfig -a | grep Link | grep HW | awk '{print $1}');
> do echo $x -m root >> /etc/arpwatch.conf ; done
> 
> # Restart arpwatch
> root at vm1:~# /etc/init.d/arpwatch restart
> 
> This is where the "elegant solution" and the "expedient solution"
> diverge a bit:  The "best" approach would be to pull the data directly from
> the arpwatch databases.  But the "expedient" approach is to pull the results
> from /var/log/syslog.  The log entries that you want look something like this:
>   root at vm8:~# grep arpwatch: /var/log/syslog | grep "new station"
> <clip>
> Jun 14 05:35:56 station245 arpwatch: new station 172.16.219.100
> a6:e5:68:a4:3f:f2 vmbr0
> Jun 14 05:35:56 station245 arpwatch: new station 172.16.219.100
> a6:e5:68:a4:3f:f2 tap101i0
> Jun 14 05:35:56 station245 arpwatch: new station 172.16.219.100
> a6:e5:68:a4:3f:f2 eth0
> Jun 14 05:35:56 station245 arpwatch: new station 172.16.219.100
> a6:e5:68:a4:3f:f2 eth0
> 
> The above is one of my VMs.  From this output, the mac and matching IP can
> be pulled. With the MAC in hand, one can find a match in /etc/pve/qemu-
> server/*.conf.  With the conf file locked, you can then drop the
> corresponding IP in the conf file as a comment so as to show up in the GUI.
> This is easy to do expediently, but the bash/awk/sed prototype that I wrote
> for proof of concept (which is working) isn't suitable for posting here just yet.
> 
> --
> Paul Gray                                         -o)
> 314 East Gym, Dept. of Computer Science           /\\
> University of Northern Iowa                      _\_V
>   Message void if penguin violated ...  Don't mess with the penguin
>   No one says, "Hey, I can't read that ASCII attachment ya sent me."
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