I am running this on ubuntu 14.04 and have set docker0 to a static ip which is then routed to from the public ip through the firewall. I am trying to set up my backend API to run in a docker container and am confused by a couple things.
1.) How would I map docker0's ip to the container's ip such that docker0 would know to send the incoming packets to the container (dynamically if possible).
2.) If not already done in such a way, how could I make it so that I don't have to set this up every time I do a fresh run of that docker container?
Thanks in advance!
I assume you want to have an IP assigned to your docker container outside of docker.
First, create a new IP and assign it to your host's interface (we assume your interface is called eth0.
$> ip addr add 10.0.0.99/8 dev eth0
Now, when you fire up the container, specify that address and link it to your docker container:
$> docker run -i -t --rm -p 10.0.0.99:80:8080 base
The -p argument will make docker create an iptables NAT rule which will nat all the traffic matching the destination 10.0.0.99:80 to your docker container on port 8080.
If you need to automate the process and scale it out, consult this resource: https://github.com/jpetazzo/pipework
The docker documentation is a good start: https://docker.github.io/engine/userguide/networking/