GetCIDRElegant 1) dump cluster info 2) grep cmdline 3) create svc + cat *.conflist 4) create svc + get pod ip with svc mask.

GetCIDRFromResourceUgly use podIP/24 and serviceIP/16 as cidr.

GetTopOwnerReferenceBySelector assume pods, controller has same labels.

NewOnAddresses creates a new PortForwarder with custom listen addresses.

SCP copy file to remote and exec command.

ForwardedPort contains a Local:Remote port pairing.

PortForwarder knows how to listen for local connections and forward them to a remote pod via an upgraded HTTP request.