What was this doing? ${KUBECTL} apply -f "https://cloud.weave.works/k8s/net?k8s-version=${version}"

[mangodan2003]

This repo seems to be abandoned, but I wonder if anybody by any chance knows what used to live at this URL, and what its purpose was?

[monro11]

Hi, it's used for implementing network policies.
Network policies are networking rules in Kubernetes that will allow you to specify how the pod can communicate with other objects. Network policies are not mandatory to establish communication with pods. However, network policies will add one more layer of network security and help control traffic at Layers 3 and 4 (IP and ports).
Network policies need a network plugin.
More detailed info you can find here:
https://github.com/containernetworking/cni
https://www.weave.works/docs/net/latest/kubernetes/kube-addon/
https://kubernetes.io/docs/tasks/administer-cluster/network-policy-provider/