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|
#!/bin/sh
# kvm init script Takes care for all VMM tasks
#
# chkconfig: - 99 01
# description: The KVM is a kernel level Virtual Machine Monitor. \
# Currently it starts a bridge and attached eth0 for it
dir=$(dirname "$0")
ifnum=${ifnum:-$(ip route list | awk '/^default / { print $NF }' | sed 's/^[^0-9]*//')}
ifnum=${ifnum:-0}
switch=${sw0:-sw${ifnum}}
pif=${pif:-eth${ifnum}}
antispoof=${antispoof:-no}
command=$1
if [ -f /etc/sysconfig/network-scripts/ifcfg-${pif} ]; then
. /etc/sysconfig/network-scripts/ifcfg-${pif}
fi
get_ip_info() {
addr=`ip addr show dev $1 | egrep '^ *inet' | sed -e 's/ *inet //' -e 's/ .*//'`
gateway=$(ip route list | awk '/^default / { print $3 }')
}
do_ifup() {
if [ ${addr} ] ; then
ip addr flush $1
ip addr add ${addr} dev $1
ip link set dev $1 up
fi
}
link_exists()
{
if ip link show "$1" >/dev/null 2>/dev/null
then
return 0
else
return 1
fi
}
create_switch () {
local switch=$1
if [ ! -e "/sys/class/net/${switch}/bridge" ]; then
brctl addbr ${switch} >/dev/null 2>&1
brctl stp ${switch} off >/dev/null 2>&1
brctl setfd ${switch} 0 >/dev/null 2>&1
fi
ip link set ${switch} up >/dev/null 2>&1
}
add_to_switch () {
local switch=$1
local dev=$2
if [ -e "/sys/class/net/${switch}/brif/${dev}" ]; then
ip link set ${dev} up >/dev/null 2>&1 || true
return
fi
brctl addif ${switch} ${dev} >/dev/null 2>&1
ip link set ${dev} up >/dev/null 2>&1
}
#taken from Xen
transfer_routes () {
local src=$1
local dst=$2
# List all routes and grep the ones with $src in.
# Stick 'ip route del' on the front to delete.
# Change $src to $dst and use 'ip route add' to add.
ip route list | sed -ne "
/dev ${src}\( \|$\)/ {
h
s/^/ip route del /
P
g
s/${src}/${dst}/
s/^/ip route add /
P
d
}" | sh -e
}
change_ips() {
local src=$1
local dst=$2
#take care also for case we do not have /etc/sysconfig data (the switch as a src case)
if [ -x $BOOTPROTO ]; then
if [ -x $(pgrep dhclient) ];then
BOOTPROTO="null"
else
BOOTPROTO="dhcp"
fi
fi
if [ $BOOTPROTO = "dhcp" ]; then
ifdown ${src} >/dev/null 2>&1 || true
ip link set ${src} up >/dev/null 2>&1
pkill dhclient >/dev/null 2>&1
for ((i=0;i<3;i++)); do
pgrep dhclient >/dev/null 2>&1 || i=4
sleep 1
done
dhclient ${dst} >/dev/null 2>&1
else
get_ip_info ${src}
ifdown ${src} >/dev/null 2>&1 || true
ip link set ${src} up >/dev/null 2>&1
do_ifup ${dst}
transfer_routes ${src} ${dst}
ip route add default via ${gateway} dev ${dst}
fi
}
antispoofing () {
iptables -P FORWARD DROP >/dev/null 2>&1
iptables -F FORWARD >/dev/null 2>&1
iptables -A FORWARD -m physdev --physdev-in ${dev} -j ACCEPT >/dev/null 2>&1
}
status () {
local dev=$1
local sw=$2
echo '============================================================'
ip addr show ${dev}
ip addr show ${sw}
echo ' '
brctl show ${sw}
echo ' '
ip route list
echo ' '
route -n
echo '============================================================'
gateway=$(ip route list | awk '/^default / { print $3 }')
ping -c 1 ${gateway} || true
echo '============================================================'
}
start () {
if [ "${switch}" = "null" ] ; then
return
fi
create_switch ${switch}
add_to_switch ${switch} ${pif}
change_ips ${pif} ${switch}
if [ ${antispoof} = 'yes' ] ; then
antispoofing
fi
/sbin/modprobe kvm
}
stop () {
if [ "${switch}" = "null" ]; then
return
fi
if ! link_exists "$switch"; then
return
fi
change_ips ${switch} ${pif}
ip link set ${switch} down
brctl delbr ${switch}
/sbin/modprobe -r kvm
}
case "$command" in
start)
echo -n $"Starting KVM: "
start
echo
;;
stop)
echo -n $"Shutting down KVM: "
stop
echo
;;
status)
status ${pif} ${switch}
;;
*)
echo "Unknown command: $command" >&2
echo 'Valid commands are: start, stop, status' >&2
exit 1
esac
|
