explore the CNI option used by k3d

k3d clusters use the Flannel CNI plugin by default (like most clusters)

$ k3d cluster create tkb --servers 1 --agents 3 --image rancher/k3s:latest

$ k3d node list
NAME               ROLE           CLUSTER   STATUS
k3d-tkb-agent-0    agent          tkb       running
k3d-tkb-agent-1    agent          tkb       running
k3d-tkb-agent-2    agent          tkb       running
k3d-tkb-server-0   server         tkb       running
k3d-tkb-serverlb   loadbalancer   tkb       running

$ docker exec -it k3d-tkb-agent-0 /bin/sh

# cd /
# find / -type f -name '*.conflist'
/var/lib/rancher/k3s/agent/etc/cni/net.d/10-flannel.conflist