diff --git a/include/NacosExceptions.h b/include/NacosExceptions.h
index 56f9561..be451fd 100644
--- a/include/NacosExceptions.h
+++ b/include/NacosExceptions.h
@@ -81,6 +81,7 @@ class NacosException : public std::exception {
     static const int UNABLE_TO_GET_HOST_IP = 1008;
     static const int UNABLE_TO_CREATE_SOCKET = 1009;
     static const int INVALID_CONFIG_PARAM = 1010;
+    static const int UNABLE_TO_GET_HOST_NAME = 1011;
 
 };
 
diff --git a/src/config/AppConfigManager.cpp b/src/config/AppConfigManager.cpp
index d3da064..935c5c0 100644
--- a/src/config/AppConfigManager.cpp
+++ b/src/config/AppConfigManager.cpp
@@ -102,6 +102,7 @@ void AppConfigManager::initDefaults() {
 
     NacosString homedir = DirUtils::getHome();
 
+    set(PropertyKeyConst::INSTANCE_ID_PREFIX, NetUtils::getHostName());
     set(PropertyKeyConst::INSTANCE_ID_SEQ_FILE, homedir + ConfigConstant::FILE_SEPARATOR + "nacos" + ConfigConstant::FILE_SEPARATOR + "instance_seq.dat");
     set(PropertyKeyConst::NACOS_SNAPSHOT_PATH, homedir + ConfigConstant::FILE_SEPARATOR + "nacos" + ConfigConstant::FILE_SEPARATOR + "snapshot");
     log_info("[AppConfigManager]-initDefaults:DEFAULT_SNAPSHOT_PATH:%s\n", appConfig[PropertyKeyConst::NACOS_SNAPSHOT_PATH].c_str());
diff --git a/src/utils/NetUtils.cpp b/src/utils/NetUtils.cpp
index 44935a7..2b986e2 100644
--- a/src/utils/NetUtils.cpp
+++ b/src/utils/NetUtils.cpp
@@ -5,6 +5,9 @@
 #include <ifaddrs.h>
 #include <src/log/Logger.h>
 #include <string.h>
+#include <unistd.h>
+
+#define HOST_AND_LEN 250
 
 namespace nacos{
 
@@ -44,4 +47,17 @@ NacosString NetUtils::getHostIp() NACOS_THROW(NacosException){
     //Usually the program will not run to here
     throw NacosException(NacosException::UNABLE_TO_GET_HOST_IP, "Failed to get IF address");
 }
+
+NacosString NetUtils::getHostName() NACOS_THROW(NacosException)
+{
+    char hostname[HOST_AND_LEN];
+    
+    int res = gethostname(hostname, HOST_AND_LEN);
+    if (res == 0) {
+        return NacosString(hostname);
+    }
+
+    throw NacosException(NacosException::UNABLE_TO_GET_HOST_NAME, "Failed to get hostname, errno = " + NacosStringOps::valueOf(errno));
+}
+
 }//namespace nacos
diff --git a/src/utils/NetUtils.h b/src/utils/NetUtils.h
index 71de3b6..bb7b23e 100644
--- a/src/utils/NetUtils.h
+++ b/src/utils/NetUtils.h
@@ -10,6 +10,9 @@ class NetUtils {
 public:
     //Get IP address (best guess)
     static NacosString getHostIp() NACOS_THROW(NacosException);
+
+    //Get hostname
+    static NacosString getHostName() NACOS_THROW(NacosException);
 };
 }//namespace nacos
 
diff --git a/test/testcase/testNamingService.cpp b/test/testcase/testNamingService.cpp
index e9806c3..952156e 100644
--- a/test/testcase/testNamingService.cpp
+++ b/test/testcase/testNamingService.cpp
@@ -71,8 +71,10 @@ bool testNamingProxySmokeTest() {
     for (int i = 0; i < 10; i++) {
         NacosString serviceName = "TestServiceName" + NacosStringOps::valueOf(i);
         NacosString serverlist = namingProxy->queryList(serviceName, ConfigConstant::DEFAULT_GROUP, "TestCluster", 0, false);
-
-        if (serverlist.find("\"serviceName\":\"" + serviceName + "\"") == string::npos) {
+        cout << serverlist << endl;
+        if (serverlist.find("\"serviceName\":\"" + serviceName + "\"") == string::npos &&
+            //nacos 2.x compatibility
+            serverlist.find("\"serviceName\":\"DEFAULT_GROUP@@" + serviceName + "\"") == string::npos) {
             cout << "Failed to get data for:" << serviceName << endl;
             return false;
         }