Platform & DevOps·Traffic into and inside the cluster
a plugin you never chose gives every pod a routable address the moment it starts, and swapping it re-plumbs the whole cluster.
Container Network Interface
Also calledCNI, network plugin
The specification and the plugin implementing it that attach each container to a network and hand it an address. It is why the orchestrator itself has no networking code and why two clusters with identical manifests can behave differently under load or under network policy. You meet it by name when addresses run out, when policy enforcement turns out to be unsupported, or when a plugin upgrade needs every node restarted.