RE: [Xen-users] how to specify vif device name?

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> Hi Jan
> 
> The domain ID changes from time to time, depending on which order the
> domains were started / restarted
> So, this is not very reliable, especially for cacti stats - which uses
the
> device name for traffic graphs

That's going to be tricky. If netfront could publish something into the
/sys entry for the device, eg domain_name=Pluto, then udev could take
care of the device renaming, but netfront doesn't do that and I'm not
even sure if that level of device driver has visibility to the /sys
entries. And it would probably break the /etc/xen/scripts/* code.

There are two approaches you could take:

1. Add some code to the appropriate script in /etc/xen/scripts to rename
the device when the domain is created via the 'ip link set vifX.0 name
pluto0' command. This might be tricky as the interface name (as vifX.0)
is used in many places in those scripts and renaming it will confuse
them.

2. Make cacti smarter about how it determines the interface name. I'm
not familiar with cacti but under mrtg, if you are on the local machine
(eg not using SNMP), you could just write a script to return the
required results.

Depending on how flexible cacti is, I'd take the latter approach.

James 


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