Watchdog

Docker containers that operate as virtual network devices such as switches or routers.

Table of Contents

1. Background Operations

Background Operations

Commands that are execute at the host to directly connect two containers via a pair of virtual interfaces (you can imagine it as being a "virtual cable" between the two containers).

These are the commands to create the interfaces and import them to the containers.

sudo ip link add veth1 type veth peer name veth2

sudo ip link set veth1 up
sudo ip link set veth2 up

sudo ip link set veth1 netns $(docker inspect -f '{{.State.Pid}}' container1)
sudo ip link set veth2 netns $(docker inspect -f '{{.State.Pid}}' container2)

docker exec -it container1 ip addr add 192.168.1.1/24 dev veth1
docker exec -it container2 ip addr add 192.168.1.1/24 dev veth2

Important notes

• The third octet of the IP address is directly correlated with the port number on the BMV2 switch.
• The fourth octet must always be 1 for the imported veth interface.