add static route for docker containers

Accessing docker container private network easily from your boot2docker host
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(from http://ispyker.blogspot.com/2014/04/accessing-docker-container-private.html)

add a Host-only adapter in VirtualBox

OSX:
    # show route table
    netstat -nr
    # set vm host as the gateway of the docker containers' prviate network 
    sudo route -n add 172.17.0.0/16 192.168.56.101
    or 
    sudo route add -net 172.17.0.0 -netmask 255.255.0.0 192.168.56.101

Linux:
    # show route table
    route
    # set vm host as the gateway of the docker containers' prviate network 
    route add -net 172.17.0.0 netmask 255.255.0.0 gw 192.168.56.101