If spec:externalTrafficPolicy is set to Cluster (default value), OpenELB randomly selects a node from all Kubernetes cluster nodes to handle Service requests. Pods on other nodes can also be reached over kube-proxy.
If spec:externalTrafficPolicy is set to Local, OpenELB randomly selects a node that contains a Pod in the Kubernetes cluster to handle Service requests. Only Pods on the selected node can be reached.
layer2 下这个功能实现了吗？v0.5.0