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#!/bin/sh
# $Id$
# Qemu environment preparation script
# ---------------------------------------------------------------------------
#
# After running this startup script, run a QEMU virtual machine in this way:
#
# vdeqemu [qemu_option [qemu_option], ...]
#
# The vdeqemu program will automatically connect
# the QEMU virtual machine to the VDE switch.
#
# ---------------------------------------------------------------------------
# The IP configuration for the tap device that will be used for
# the virtual machine network:
TAP_DEV=tap0
TAP_IP=10.111.111.254
TAP_MASK=255.255.255.0
TAP_BCAST=`/bin/ipmask ${TAP_MASK} ${TAP_IP} | cut -f 1 -d ' '`
# Host interfaces that need to be NAT-ed (in case we're nog bridging):
NAT_IFS="eth+"
# Definitions for the LAN segment the Qemu virtual machines will be in.
# These definitions will be fed to dnsmasq - this program will provide DNS
# and DHCP to the Qemu LAN.
# The VM_IPLOW and VM_IPHIGH addresses must agree with the definitions for
# the tap0 device above. These 'low' and 'high' values are the IP address
# range for the DHCP server to use.
VM_DOMAIN=qemu.lan
VM_IPLOW=10.111.111.128
VM_IPHIGH=10.111.111.199
VM_BCAST=${TAP_BCAST}
VM_MASK=${TAP_MASK}
# For additional options to dnsmasq:
#DNSMASQ_OPTIONS="--server /my.net/192.168.1.1"
DNSMASQ_OPTIONS=""
# See how we were called.
case "$1" in
start)
echo -n "Starting VDE network for QEMU: "
# If we are running 2.6, load tun module
if uname -r | grep '^2.6'; then
/sbin/modprobe tun 2>/dev/null
sleep 1
fi
# Start tap switch
vde_switch -tap ${TAP_DEV} -daemon
# Bring tap interface up
ifconfig ${TAP_DEV} ${TAP_IP} broadcast ${TAP_BCAST} netmask ${TAP_MASK}
# Start IP Forwarding
echo "1" > /proc/sys/net/ipv4/ip_forward
for NIC in ${NAT_IFS}; do
iptables -t nat -A POSTROUTING -o ${NIC} -j MASQUERADE
done
# Change pipe permission
chmod 666 /tmp/vde.ctl
# If we are not running 2.6, apply workaround
if uname -r | grep '^2.4'; then
echo 1024 > /proc/sys/dev/rtc/max-user-freq
fi
# Start dnsmasq, the DNS/DHCP server
# for our Virtual Machines behind the tap0 interface
/usr/sbin/dnsmasq \
--log-queries \
--user=named \
--dhcp-leasefile=/var/state/dhcp/qemu-dhcpd.leases \
--dhcp-range=${VM_IPLOW},${VM_IPHIGH},${VM_MASK},${VM_BCAST},8h \
--interface=${TAP_DEV} \
--domain=${VM_DOMAIN} \
$DNSMASQ_OPTIONS
echo
;;
stop)
echo -n "Stopping VDE network for QEMU: "
{
# Delete the NAT rules
for NIC in ${NAT_IFS}; do
iptables -t nat -D POSTROUTING -o ${NIC} -j MASQUERADE
done
# Bring tap interface down
ifconfig ${TAP_DEV} down
# Kill VDE switch
pgrep -f vde_switch | xargs kill -TERM
# Remove the control socket
rm -f /tmp/vde.ctl
# Stop dnsmasq
pgrep -f dnsmasq | xargs kill -TERM
} >/dev/null 2>&1
echo
;;
restart|reload)
$0 stop
$0 start
;;
*)
echo "Usage: $0 {start|stop|restart|reload}"
exit 1
esac
|
