cnitool is a simple program that executes a CNI configuration. It will
add or remove an interface in an already-created network namespace.
First, install cnitool:
go install github.com/containernetworking/cni/cnitool
Then, check out and build the plugins. All commands should be run from this directory.
git clone https://github.com/containernetworking/plugins.git
cd plugins
./build.sh
Create a network configuration
echo '{"cniVersion":"0.3.1","name":"myptp","type":"ptp","ipMasq":true,"ipam":{"type":"host-local","subnet":"172.16.29.0/24","routes":[{"dst":"0.0.0.0/0"}]}}' | sudo tee /etc/cni/net.d/10-myptp.conf
Create a network namespace. This will be called testing:
sudo ip netns add testing
Add the container to the network:
sudo CNI_PATH=./bin cnitool add myptp /var/run/netns/testing
Test that it works:
sudo ip -n testing addr
sudo ip netns exec testing ping -c 1 4.2.2.2
And clean up:
sudo CNI_PATH=./bin cnitool del myptp /var/run/netns/testing
sudo ip netns del testing