Backends: included a redirector example for multiple backends

custom.backend.vcl-sample

@@ -13,3 +13,33 @@ backend default {
     }
     .first_byte_timeout = 300s;
 }
+
+# Below is an example redirector based on the Client IP (same returning class C subnet IP will get
+# rerouted to the same backend, as long as it's available).
+#
+# In order for these to work, you need to define 2 backends as shown above named 'web1' and 'web2' (replace 'default'
+# from the example above).
+director pool_clientip client {
+  {
+    .backend = web1
+    .weight = 1;
+  }
+  {
+    .backend = web2
+    .weight = 1;
+  }
+}
+
+# Below is an example that will round-robin (based on the weight) to each backend.
+# Web2 will get twice the hits as web1 since it has double the weight (= preference).
+director pool_clientip {
+  {
+    .backend = web1
+    .weight = 1;
+  }
+  {
+    .backend = web2
+    .weight = 2;
+  }
+}
+