VNet-manager

VNet-manager a virtual network manager - manages containers to create virtual networks.

What is it?

VNet-manager allows you to create quick virtual network setups using LXC containers. VNet-manager will create and manage the containers you need to create a virtual network. This is done in combination with FRRouting.
Because VNet-manager makes heavy use of LXC, the current supported operating systems are Ubuntu Bionic (18.04) and Focal Fossa (20.04).

How to use it

In order to run VNet-manager you need to create a config file for the program to works with. In this config file you can create your network topology. When this config file is created it should always be passed to VNet-manager as an argument. This ensures that the program itself does not have to store any state. See the README for a more detailed explanation on how to create a config file. There are also some example config files

Setup

Install the required packages

apt-get update
apt-get install gcc python3-dev python3-apt python3-pip python3-venv git lxc bridge-utils tcpdump net-tools curl

For Ubuntu 18.04;

# Note that vnet-manager requires python3.8
apt-get install lxd

In later versions of Ubuntu;

snap install lxd

Clone the repo, with virtualenv
This install method will create a local Python environment for vnet-manager to run in. This is recommended on older versions of Ubuntu.

git clone https://github.com/Erik-Lamers1/vnet-manager.git ~/vnet-manager
cd ~/vnet-manager
python3 -m venv .venv
source .venv/bin/activate
pip install -U pip
pip install vnet-manager

When using this install method you can optionally create a alias to easily enter the virtualenv;

# For Bash
echo "alias vnet-venv='cd ~/vnet-manager; source .venv/bin/activate'" >> ~/.bashrc
# For ZSH
echo "alias vnet-venv='cd ~/vnet-manager; source .venv/bin/activate'" >> ~/.zshrc

Clone the repo, global install
This install method will make the vnet-manager command available system-wide. Please note that system Python packages may interfere with usage. See; PyopenSSL issue

git clone https://github.com/Erik-Lamers1/vnet-manager.git ~/vnet-manager
pip3 install vnet-manager
cd ~/vnet-manager

Optionally, vnet-manager can be installed from the cloned repo directly if you want to make changes to the repo locally;

python3 setup.py install

Setup LXD
If you are running a clean LXD install you can import the provided preseed file;

source /etc/os-release
lxd init --preseed < config/lxd/ubuntu$VERSION_ID.yaml

If you already had LXD installed, make sure that the there is a the default storage pool, profile and lxdbr0 network bridge are present. Depending on your configuration it might still be safe to run the preseed file using lxd init.

Quick start

Use one of the example configs to see if your environment is working correctly.

vnet-manager create config/example.yaml
vnet-manager start config/example.yaml
lxc exec host1 -- ping -c 2 router1

Advanced usage

There are a couple of things that can be tweaked when using VNet-manager. This can be done using specific environment variables.

VNET_SNIFFER_PCAP_DIR    - Sets the directory where the sniffer PCAP files will be created
VNET_LXC_BASE_IMAGE      - Sets the alias for the LXC base image, only set when using a custom base image
VNET_FORCE               - Internal env var, used with --yes. Do not set manually

Rebuilding the Base Container

Sometimes you will have to rebuild the base container, for instance if you want to install additional packages. To do this you will first have to destroy the base container and then when creating the new setup the base container will be automagically recreated. This might take a bit longer for that reason.

$ vnet-manager destroy -b
$ vnet-manager create /path/to/your/config.yaml

Installing Additional Packages

The provider specific packages list can be found in the settings under PROVIDERS. Here you can specify which packages the host should have and which to install on the base container.

Extending settings

The default settings file can be extended with anything you think should be added (or removed) to make your local project work. The way this can be done is similar to the way settings are loaded in Django, meaning you can set the SETTINGS_MODULE env var to let vnet-manager know you are using a custom settings module. For example, say we want to add support for Gentoo, you can create a custom setting file like this in vnet_manager/settings/dev.py;

from .base import *  # pylint: disable=W0401

PROVIDERS["lxc"]["supported_operating_systems"].append("gentoo")

Then set your SETTINGS_MODULE to point to this file

export SETTINGS_MODULE=vnet_manager.settings.dev

Development

Opening pull requests for new features and bug fixes is highly appreciated!
Before you do make sure you set up your development environment.

apt-get install -y tox virtualenvwrapper libapt-pkg-dev intltool
# Depending on your console setup, you might have to logout and in again to make sure virtualenvwrapper is loaded
# cd to your development directory
cd ~/vnet-manager
mkvirtualenv -p /usr/bin/python3.8 -a $(pwd) vnet-manager
pip install -U pip
pip install -r requirements/development.txt
pre-commit install

Running the tests

Simply run tox in the vnet-manager directory.