Container_Networks

Python scripting and Shell scripting to help provide automated network of Docker container.

Base Machine used for running scripts and set up -> Ubuntu 16.04 LTS

So this project is about giving the user few options to give input as a list of containers and the type of network they want the containers to be connected in.

Steps for using it are as follows ->

1) Install docker.io on your Ubuntu machine -

$ sudo apt-get install docker.io

2) For creating Docker networks I have used a pre-defined Dockerfile that would install latest Ubuntu base image and needed utilities. It is located at - Dockerfile.

Create a Docker image -

$ sudo docker build -t fw_ubuntu .

3) Run the script create_network.py which is an interactive Python script.

$ python create_networks.py

This will give the user three options for creating networks ->

i. Veth pair - This will take in list of containers (limited to two now since one would want a single veth pair between 2 containers) and then create a veth pair, attach them to the two Docker containers - assign IPs within a same subnet (which is incremented by octet number each time so that duplicate IPs are not assigned).

ii. Bridge network - This will take in list of containers, spawn Docker containers, add a bridge using 'brctl' utility and connect the containers to it. Assigns IPs in same subnet to all these containers and adds default routes so that all can ping each other.

Demo run of my script for veth pair and bridge network -

iii. Tunnel Network - This will create a GRE tunnel. This was a little tough to think of because the underlay would have to be pre-defined and if the user would need to give so many details, it would not serve the great purpose of automation. So, I have automated the creation of the following topology as show below ->

The user can connect CS1, CS2, CS3, CS4 - customer containers to the GRE tunnel network - which is built between SC1 and SC2. If the need is to only create a tunnel between two containers - it is an easy task just have to add rules on both ends, however it is difficult to understand if we do not know the underlay network.

Thanks I hope you liked this demo! :) Please give it a star if you liked it!