diff --git a/kong/plugins/skywalking/handler.lua b/kong/plugins/skywalking/handler.lua
index 6ab3dd8..a8b756a 100644
--- a/kong/plugins/skywalking/handler.lua
+++ b/kong/plugins/skywalking/handler.lua
@@ -26,6 +26,11 @@ local SkyWalkingHandler = {
 function SkyWalkingHandler:access(config)
   kong.log.info('access phase of skywalking plugin')
   kong.ctx.plugin.skywalking_sample = false
+  -- set hostname to service_instance_name
+  local hostname = os.getenv("HOSTNAME")
+  if config.cluster_flag and hostname ~= nil then
+    config.service_instance_name = hostname
+  end
   if config.sample_ratio == 1 or math.random() * 10000 < config.sample_ratio then
       kong.ctx.plugin.skywalking_sample = true
       sw_client:startBackendTimer(config) 
diff --git a/kong/plugins/skywalking/schema.lua b/kong/plugins/skywalking/schema.lua
index 9ddcfdf..3691eab 100644
--- a/kong/plugins/skywalking/schema.lua
+++ b/kong/plugins/skywalking/schema.lua
@@ -26,8 +26,9 @@ return {
         fields = {
           { backend_http_uri = typedefs.url({ required = true }) },
           { service_name = { type = "string", default = "Kong Service", }, },
+		  { cluster_flag = { type = "boolean", default = false }, },
           { service_instance_name = { type = "string", default = "Kong Service Instance", }, },
-          { sample_ratio = { type = "number", between = { 1 , 10000 }, default = 1 }, },
+		  { sample_ratio = { type = "number", between = { 1 , 10000 }, default = 1 }, },
         },
       },
     },