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@leoh0
Created April 2, 2015 17:28
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openstack l2path draw
#!/bin/bash
sudo apt-get install -qqy ethtool libgraph-easy-perl graphviz > /dev/null
EXCEPT=/tmp/exceptlist
echo '' > $EXCEPT
result=""
function on_exit() {
rm -f $EXCEPT
}
trap "on_exit" EXIT
# find ovs br <-> port
if [ "x$(which ovs-vsctl)" != "x" ]; then
for br in $(sudo ovs-vsctl list-br); do
for port in $(sudo ovs-vsctl list-ports $br); do
result=$(echo "$result [$port]---->[$br] [$br]---->[$port] ")
done
done
fi
# find br <-> port
for br in $(brctl show | sed '1d' | grep '^[a-z]' | awk '{print $1}'); do
for port in $(brctl show $br | sed '1d' | sed 's/.*\t.*\t.*\t\(.*\)/\1/g'); do
result=$(echo "$result [$port]---->[$br] [$br]---->[$port] ")
done
done
# ip namespace veth
for ns in $(ip netns); do
for interface in $(ip netns exec $ns ip a | cut -d':' -f-2 | grep ^[1-9]); do
index=$(ip netns exec $ns ethtool -S $interface 2> /dev/null | grep peer_ifindex | awk '{print $2}')
ifname=$(ip netns exec $ns ip a | grep "^$index:" | awk '{print $2}' | cut -d':' -f1)
if [ "x$ifname" == "x" ]; then
ifname=$(ip a | grep "^$index:" | awk '{print $2}' | cut -d':' -f1)
if [ "x$ifname" != "x" ]; then
echo $ifname >> $EXCEPT
result=$(echo "$result [$interface]---->[$ifname] [$ifname]---->[$interface] ")
fi
fi
done
done
# ip veth
for interface in $(ip a | cut -d':' -f-2 | grep ^[1-9]); do
if cat $EXCEPT | grep -q "^$interface$" ; then continue ; fi
index=$(ethtool -S $interface 2> /dev/null | grep peer_ifindex | awk '{print $2}')
ifname=$(ip a | grep "^$index:" | awk '{print $2}' | cut -d':' -f1)
if [ "x$ifname" != "x" ]; then
echo $ifname >> $EXCEPT
result=$(echo "$result [$interface]---->[$ifname] [$ifname]---->[$interface] ")
fi
done
# vm tap
for tap in $(ip a | cut -d':' -f-2 | grep ^[1-9] | cut -d' ' -f2 | grep '^tap'); do
vmuuid=$(grep -rl "$tap" /var/lib/nova/instances/*/libvirt.xml | cut -d'/' -f6)
if [ "x$vmuuid" != "x" ]; then
result=$(echo "$result [$tap]---->[VM-$vmuuid] [VM-$vmuuid]---->[$tap] ")
fi
done
rm -f $EXCEPT
echo $result | graph-easy
echo $result | graph-easy -as dot | dot -Tpng -o l2path.png
@FlorianHeigl
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I love this SO MUCH.

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