While trying to setup a CNI in my Vagrant local cluster built with
kubeadm I realized there is no kubectl you can do to determine it.
You have to look around at the host environment or infer it from the
running Pods. All I wanted to do was look at an existing cluster to tell
what it is using. Seems like a simple enough thing to want to figure
out.
The best I could figure out (with the help of friends) is to look in
/etc/cni/net.d and use the process of elimination. For example, after
having installed Calico I have the following:
$ ls /etc/cni/net.d
10-calico.conflist calico-kubeconfig