kube-proxy via ipvs

    DR mode

    1. # continue above setup;
    2. $ PID=$(docker inspect -f '{{.State.Pid}}' k8s_nginx_nginx-348975970-rtqrz_default_b1661284-2eeb-11e7-924d-8825937fa049_0)
    3. $ sudo mkdir -p /var/run/netns
    4. $ sudo ip link add type dummy
    6. $ sudo ip netns exec $PID ip addr add 10.0.0.185 dev dummy1
    7. $ sudo ip netns exec $PID ip link set dummy1 up
    8. # same for the other pod
    9. $ sudo ipvsadm -D -t 10.0.0.185:80
    11. $ sudo ipvsadm -a -t 10.0.0.185:80 -r 172.17.0.4:80 -g    
    12. $ docker run -ti busybox wget -qO- 10.0.0.185:80
    13. <!DOCTYPE html>
    14. // truncated