Multiple IP Addresses for Conatiner

[Dhiraj Kasliwal]

I wanna give multiple address for single container for single container . But as soon as i give addresses I am unable to reach gateway of that address .

Is anyone given multiple addresses in single container?

[Sven Dowideit]

I'm not sure what you mean - containers typically talk to the private docker0 bridge

Its probably worthwhile reading https://docs.docker.com/articles/networking/ to see what options Docker makes available, and if thats not quite enough, https://github.com/jpetazzo/pipework contains some other tricks that may help you

can you be more specific about what you're working to acheive?

Sven

[Dhiraj Kasliwal]

Thanks for your reply. Actually I wanna make docker container as Load-Balancer. For that I need live IP inside container and my server directly contact with container.

[Sven Dowideit]

in that case, `--net host` might give you the control you need :)

[Jens Schutt]

You can set up another vnic for that container. Not that it is pretty, but ....

$ export CONTAINER_NAME=myDockerContainer

$ export PID=`docker inspect -f '{{.State.Pid}}' $CONTAINER_NAME 2> /dev/null` 

$ ip link add veth${PID}_eth0 type veth peer name peer${PID}_eth0

$ ip link set veth${PID}_eth0 up

$ export MAC=`ip link show peer${PID}_eth0 | grep link/ether | sed "s/^ *link\/ether //" | sed "s/ brd.*//"`

$ mkdir -p /var/run/netns

$ ln -s /proc/${PID}/ns/net /var/run/netns/$CONTAINER_NAME

$ ip link set peer${PID}_eth0 netns $CONTAINER_NAME

$ ip netns exec $CONTAINER_NAME ip link set dev peer${PID}_eth0 name eth1

$ ip netns exec $CONTAINER_NAME ip link set eth1 up

$ ip netns exec $CONTAINER_NAME ip addr add 192.0.0.10/20 dev eth1

[Sven Dowideit]

Nice job Jens!

is there any chance you'd be willing to add some prose around that and make a PR against

https://docs.docker.com/articles/networking/

I'm thinking it would be pretty neat to have an example that shows binding a real `eth1` against one container - and thats really just a small change from your description (and very similar to the point to point example really)

Sven

[Dhiraj Kasliwal]

Thanks Sven and Jens for your answer.

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