Docker veth to container mapping

veth.sh

#!/bin/bash
# Credits to https://superuser.com/a/1183520
for container in $(docker ps -q); do
    if docker exec -t $container which sh > /dev/null 2>&1; then
      iflink=`docker exec -it $container sh -c 'cat /sys/class/net/eth0/iflink'`
      iflink=`echo $iflink|tr -d '\r'`
      veth=`grep -l $iflink /sys/class/net/veth*/ifindex`
      veth=`echo $veth|sed -e 's;^.*net/\(.*\)/ifindex$;\1;'`
      echo $container:$veth
    else
      echo "Can't retrieve info for $container"
    fi
done