Daniel Qarras wrote:
Hi!
In general the setup is exactly like qemu, so any howto for qemu is
applicable.
Here's what I do:
- copy scripts/kvm from the kvm tarball to /etc/init.d, chkconfig and
start the kvm service. that sets up a bridge
- copy scripts/qemu-ifup into a new directory /etc/kvm. make sure it
is executable.
- run qemu like this:
qemu-system-x86_64 -net nic -net tap,script=/etc/kvm/qemu-ifup
[other options]...
Thanks for your kind answer but unfortunately I cannot find the scripts
you mentioned from the kvm tar ball:
sh-3.1$ find kvm-14 | grep scripts
kvm-14/scripts
kvm-14/scripts/run_img
kvm-14/scripts/65-kvm.rules
kvm-14/scripts/mkbootdisk
sh-3.1$
There is kvm-14/kvm script but that doesn't look at all like a Red Hat
init script, it a Python script. I googled for qemu-ifup and found
about dozen different kind of versions so I'm not sure which one I
should use. But definetely the scripts you mentioned would be just what
I was looking for!
Sorry, the scripts didn't make it into the release. I'm attaching them
here.
If you're running Fedora, it looks like there's some bridging support in
initscripts (I haven't tried it though).
--
error compiling committee.c: too many arguments to function
#!/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} 0.1 >/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 [ ${antispoof} = 'yes' ] ; then
antispoofing
fi
grep -q GenuineIntel /proc/cpuinfo && /sbin/modprobe kvm-intel
grep -q AuthenticAMD /proc/cpuinfo && /sbin/modprobe kvm-amd
}
stop () {
if [ "${switch}" = "null" ]; then
return
fi
if ! link_exists "$switch"; then
return
fi
change_ips ${switch} ${pif}
ip link set ${switch} down
brctl delbr ${switch}
grep -q GenuineIntel /proc/cpuinfo && /sbin/modprobe -r kvm-intel
grep -q AuthenticAMD /proc/cpuinfo && /sbin/modprobe -r kvm-amd
/sbin/modprobe -r kvm
}
case "$command" in
start)
echo -n $"Starting KVM: "
start
echo
;;
stop)
echo -n $"Shutting down KVM: "
stop
echo
;;
status)
status ${pif} ${switch}
;;
*)
echo "Unknown command: $command" >&2
echo 'Valid commands are: start, stop, status' >&2
exit 1
esac
#!/bin/sh
switch=$(ip route list | awk '/^default / { print $NF }')
ifconfig $1 0.0.0.0 up
brctl addif ${switch} $1
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