Belkin XM Commander Bedienungsanleitung PDF herunterladen (Seite 38)

dhcp Set to ’dhcp’ if you want to use DHCP to conﬁgure networking.

netmask Manually conﬁgured IP netmask.

gateway Manually conﬁgured IP gateway.

hostname Set the hostname for the virtual machine.

root Specify the root device parameter on the kernel command line.

nfs server IP address for the NFS server (if any).

nfs root Path of the root ﬁlesystem on the NFS server (if any).

extra Extra string to append to the kernel command line (if any)

restart Three possible options:

always Always restart the domain, no matter what its exit code is.

never Never restart the domain.

onreboot Restart the domain iff it requests reboot.

For additional ﬂexibility, it is also possible to include Python scripting commands in

conﬁguration ﬁles. An example of this is the xmexample2 ﬁle, which uses Python

code to handle the vmid variable.

7.2 Network Conﬁguration

For many users, the default installation should work ‘out of the box’. More compli-

cated network setups, for instance with multiple ethernet interfaces and/or existing

bridging setups will require some special conﬁguration.

The purpose of this section is to describe the mechanisms provided by xend to allow a

ﬂexible conﬁguration for Xen’s virtual networking.

7.2.1 Xen virtual network topology

Each domain network interface is connected to a virtual network interface in dom0

by a point to point link (effectively a ‘virtual crossover cable’). These devices are

named vif<domid>.<vifid> (e.g. vif1.0 for the ﬁrst interface in domain 1,

vif3.1 for the second interface in domain 3).

Trafﬁc on these virtual interfaces is handled in domain 0 using standard Linux mech-

anisms for bridging, routing, rate limiting, etc. Xend calls on two shell scripts to per-

form initial conﬁguration of the network and conﬁguration of new virtual interfaces.

By default, these scripts conﬁgure a single bridge for all the virtual interfaces. Arbi-

trary routing / bridging conﬁgurations can be conﬁgured by customising the scripts, as

described in the following section.

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Belkin XM Commander Bedienungsanleitung Seite 38