Choosing the right source VIP for local endpoints

kubernetes · Nov 22, 2020 · f848717 · f848717
1 parent 94a0349
commit f848717
Showing 1 changed file with 12 additions and 1 deletion.
diff --git a/pkg/proxy/winkernel/proxier.go b/pkg/proxy/winkernel/proxier.go
@@ -1078,7 +1078,18 @@ func (proxier *Proxier) syncProxyRules() {
 				}
 			}
 
-			if proxier.network.networkType == "Overlay" {
+			// For Overlay networks 'SourceVIP' on an Load balancer Policy can either be chosen as
+			// a) Source VIP configured on kube-proxy (or)
+			// b) Node IP of the current node
+			//
+			// For L2Bridge network the Source VIP is always the NodeIP of the current node and the same
+			// would be configured on kube-proxy as SourceVIP
+			//
+			// The logic for choosing the SourceVIP in Overlay networks is based on the backend endpoints:
+			// a) Endpoints are any IP's outside the cluster ==> Choose NodeIP as the SourceVIP
+			// b) Endpoints are IP addresses of a remote node => Choose NodeIP as the SourceVIP
+			// c) Everything else (Local POD's, Remote POD's, Node IP of current node) ==> Choose the configured SourceVIP
+			if proxier.network.networkType == "Overlay" && !ep.GetIsLocal() {
 				providerAddress := proxier.network.findRemoteSubnetProviderAddress(ep.IP())
 
 				isNodeIP := (ep.IP() == providerAddress)