How to set up a container just like a virtual machine in bridge mode? (meaning, the container gets its own external ip)

General
9

well, neither pipework or network_wrapper work anymore

but I have it working, under a vm without promiscuous mode…
updated… no timing problem

1. create a docker network with the same address range as the network u want your containers in
    if from the host then  you can get the info from  ip route 
    ip_address_for_network script
    ROUTE_INFO=$(ip route | grep default )
    IPGW=$(echo $ROUTE_INFO | awk '{ print $3}')
    IP_INTERFACE=$(echo $ROUTE_INFO | awk '{ print $5}')
    OUR_ADDRESS=$(ip addr | grep -A1 $IP_INTERFACE | grep "inet " | awk '{print $2}' | awk -F "/" '{print $1}')
    NETINFO=$(ip route | grep -m1 $OUR_ADDRESS | awk '{print $1}')
    echo --gateway=$IPGW --subnet=$NETINFO

    docker network create -d macvlan $(./ip_address_for_network) network_name

2. generate a mac address (docker will reuse the same ones all the time)
    ( use something unique)
    mac_from_string script
    #!/bin/bash
    echo $1|md5sum|sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/'

3. run a busybox udhcpc task to get a dhcp server assigned address for that mac address
    docker run --net network_name --cap-add NET_ADMIN --rm --mac-address **_mac_from_step_2_** busybox udhcpc  -x "hostname:whatever u want"  | grep lease | awk '{print $4}'

 this container will request an ip address from the dhcp server on the 'network' using the mac_address. 
and then die --- need to do: renew lease til the  actual container ends.. need to figure out docker events. 

4. start your container,  using the mac address u generated in step 2 and the ip address from step 3
    docker run -d --net network_name --mac-address "from step 2" --ip "from step 3" other_options  image image_parms

steps 2-4 need to be done for every container being started