diff --git a/conf/standalone.conf b/conf/standalone.conf
new file mode 100644
index 0000000..06c8fef
--- /dev/null
+++ b/conf/standalone.conf
@@ -0,0 +1,71 @@
+## redis standalone server pool define
+
+##StandaloneServerPool {
+##    [Password xxx]                        #default no
+##    [Databases number]                    #default 1
+##    Hash atol|crc16
+##    [HashTag "xx"]                        #default no
+##    Distribution modula|random
+##    [MasterReadPriority [0-100]]          #default 50
+##    [StaticSlaveReadPriority [0-100]]     #default 0
+##    [DynamicSlaveReadPriority [0-100]]    #default 0
+##    RefreshMethod fixed|sentinel          #
+##    [RefreshInterval number[s|ms|us]]     #default 1, means 1 second
+##    [ServerTimeout number[s|ms|us]]       #default 0, server connection socket read/write timeout
+##    [ServerFailureLimit number]           #default 10
+##    [ServerRetryTimeout number[s|ms|us]]  #default 1
+##    [KeepAlive seconds]                   #default 0, server connection tcp keepalive
+##    Sentinels [sentinel-password] {
+##        + addr
+##        ...
+##    }
+##    Group xxx {
+##        [+ addr]                          #if RefreshMethod==fixed: the first addr is master in a group, then all addrs is slaves in this group
+##        ...
+##    }
+##}
+
+
+## Examples:
+#StandaloneServerPool {
+#    Databases 16
+#    Hash crc16
+#    HashTag "{}"
+#    Distribution modula
+#    MasterReadPriority 60
+#    StaticSlaveReadPriority 50
+#    DynamicSlaveReadPriority 50
+#    RefreshMethod sentinel
+#    RefreshInterval 1
+#    ServerTimeout 1
+#    ServerFailureLimit 10
+#    ServerRetryTimeout 1
+#    KeepAlive 120
+#    Sentinels {
+#        + 10.2.2.2:7500
+#        + 10.2.2.3:7500
+#        + 10.2.2.4:7500
+#    }
+#    Group shard001 {
+#    }
+#    Group shard002 {
+#    }
+#}
+
+#StandaloneServerPool {
+#    Databases 16
+#    Hash crc16
+#    HashTag "{}"
+#    Distribution modula
+#    MasterReadPriority 60
+#    StaticSlaveReadPriority 50
+#    DynamicSlaveReadPriority 50
+#    RefreshMethod fixed
+#    ServerTimeout 1
+#    ServerFailureLimit 10
+#    ServerRetryTimeout 1
+#    KeepAlive 120
+#    Group shard001 {
+#       + 10.2.3.2:6379
+#    }
+#}
diff --git a/src/Conf.cpp b/src/Conf.cpp
index 8033704..7f2d7b9 100644
--- a/src/Conf.cpp
+++ b/src/Conf.cpp
@@ -125,7 +125,7 @@ void Conf::setGlobal(const ConfParser::Node* node)
 {
     const ConfParser::Node* authority = nullptr;
     const ConfParser::Node* clusterServerPool = nullptr;
-    const ConfParser::Node* sentinelServerPool = nullptr;
+    const ConfParser::Node* standaloneServerPool = nullptr;
     const ConfParser::Node* dataCenter = nullptr;
     std::vector<const ConfParser::Node*> latencyMonitors;
     for (auto p = node; p; p = p->next) {
@@ -162,7 +162,9 @@ void Conf::setGlobal(const ConfParser::Node* node)
         } else if (strcasecmp(p->key.c_str(), "ClusterServerPool") == 0) {
             clusterServerPool = p;
         } else if (strcasecmp(p->key.c_str(), "SentinelServerPool") == 0) {
-            sentinelServerPool = p;
+            standaloneServerPool = p;
+        } else if (strcasecmp(p->key.c_str(), "StandaloneServerPool") == 0) {
+            standaloneServerPool = p;
         } else if (strcasecmp(p->key.c_str(), "DataCenter") == 0) {
             dataCenter = p;
         } else if (strcasecmp(p->key.c_str(), "CustomCommand") == 0) {
@@ -174,14 +176,17 @@ void Conf::setGlobal(const ConfParser::Node* node)
     if (authority) {
         setAuthority(authority);
     }
-    if (clusterServerPool && sentinelServerPool) {
-        Throw(LogicError, "Can't define ClusterServerPool and SentinelServerPool at the same time");
+    if (clusterServerPool && standaloneServerPool) {
+        Throw(LogicError, "Can't define ClusterServerPool/StandaloneServerPool at the same time");
     } else if (clusterServerPool) {
         setClusterServerPool(clusterServerPool);
         mServerPoolType = ServerPool::Cluster;
-    } else if (sentinelServerPool) {
-        setSentinelServerPool(sentinelServerPool);
-        mServerPoolType = ServerPool::Sentinel;
+    } else if (standaloneServerPool) {
+        if (strcasecmp(standaloneServerPool->key.c_str(), "SentinelServerPool") == 0) {
+            mStandaloneServerPool.refreshMethod = ServerPoolRefreshMethod::Sentinel;
+        }
+        setStandaloneServerPool(standaloneServerPool);
+        mServerPoolType = ServerPool::Standalone;
     } else {
         Throw(LogicError, "Must define a server pool");
     }
@@ -253,28 +258,21 @@ void Conf::setAuthority(const ConfParser::Node* node)
 
 bool Conf::setServerPool(ServerPoolConf& sp, const ConfParser::Node* p)
 {
+    bool ret = true;
     if (setStr(sp.password, "Password", p)) {
-        return true;
     } else if (setInt(sp.masterReadPriority, "MasterReadPriority", p, 0, 100)) {
-        return true;
     } else if (setInt(sp.staticSlaveReadPriority, "StaticSlaveReadPriority", p, 0, 100)) {
-        return true;
     } else if (setInt(sp.dynamicSlaveReadPriority, "DynamicSlaveReadPriority", p, 0, 100)) {
-        return true;
     } else if (setDuration(sp.refreshInterval, "RefreshInterval", p)) {
-        return true;
     } else if (setDuration(sp.serverTimeout, "ServerTimeout", p)) {
-        return true;
     } else if (setInt(sp.serverFailureLimit, "ServerFailureLimit", p, 1)) {
-        return true;
     } else if (setDuration(sp.serverRetryTimeout, "ServerRetryTimeout", p)) {
-        return true;
     } else if (setInt(sp.keepalive, "KeepAlive", p, 0)) {
-        return true;
     } else if (setInt(sp.databases, "Databases", p, 1, 128)) {
-        return true;
+    } else {
+        ret = false;
     }
-    return false;
+    return ret;
 }
 
 void Conf::setClusterServerPool(const ConfParser::Node* node)
@@ -298,41 +296,47 @@ void Conf::setClusterServerPool(const ConfParser::Node* node)
     }
 }
 
-void Conf::setSentinelServerPool(const ConfParser::Node* node)
+void Conf::setStandaloneServerPool(const ConfParser::Node* node)
 {
     if (!node->sub) {
-        Throw(InvalidValue, "%s:%d SentinelServerPool require scope value", node->file, node->line);
+        Throw(InvalidValue, "%s:%d StandaloneServerPool require scope value", node->file, node->line);
     }
-    mSentinelServerPool.hashTag[0] = '\0';
-    mSentinelServerPool.hashTag[1] = '\0';
+    mStandaloneServerPool.hashTag[0] = '\0';
+    mStandaloneServerPool.hashTag[1] = '\0';
     for (auto p = node->sub; p; p = p->next) {
-        if (setServerPool(mSentinelServerPool, p)) {
+        if (setServerPool(mStandaloneServerPool, p)) {
+        } else if (strcasecmp(p->key.c_str(), "RefreshMethod") == 0) {
+            try {
+                mStandaloneServerPool.refreshMethod = ServerPoolRefreshMethod::parse(p->val.c_str());
+            } catch (ServerPoolRefreshMethod::InvalidEnumValue& excp) {
+                Throw(InvalidValue, "%s:%d unknown RefreshMethod:%s", p->file, p->line, p->val.c_str());
+            }
         } else if (strcasecmp(p->key.c_str(), "Distribution") == 0) {
-            mSentinelServerPool.dist = Distribution::parse(p->val.c_str());
-            if (mSentinelServerPool.dist == Distribution::None) {
+            mStandaloneServerPool.dist = Distribution::parse(p->val.c_str());
+            if (mStandaloneServerPool.dist == Distribution::None) {
                 Throw(InvalidValue, "%s:%d unknown Distribution", p->file, p->line);
             }
         } else if (strcasecmp(p->key.c_str(), "Hash") == 0) {
-            mSentinelServerPool.hash = Hash::parse(p->val.c_str());
-            if (mSentinelServerPool.hash == Hash::None) {
+            mStandaloneServerPool.hash = Hash::parse(p->val.c_str());
+            if (mStandaloneServerPool.hash == Hash::None) {
                 Throw(InvalidValue, "%s:%d unknown Hash", p->file, p->line);
             }
         } else if (strcasecmp(p->key.c_str(), "HashTag") == 0) {
             if (p->val.empty()) {
-                mSentinelServerPool.hashTag[0] = '\0';
-                mSentinelServerPool.hashTag[1] = '\0';
+                mStandaloneServerPool.hashTag[0] = '\0';
+                mStandaloneServerPool.hashTag[1] = '\0';
             } else if (p->val.size() == 2) {
-                mSentinelServerPool.hashTag[0] = p->val[0];
-                mSentinelServerPool.hashTag[1] = p->val[1];
+                mStandaloneServerPool.hashTag[0] = p->val[0];
+                mStandaloneServerPool.hashTag[1] = p->val[1];
             } else {
                 Throw(InvalidValue, "%s:%d HashTag invalid", p->file, p->line);
             }
-        } else if (setServers(mSentinelServerPool.sentinels, "Sentinels", p)) {
-            mSentinelServerPool.sentinelPassword = p->val;
+        } else if (setServers(mStandaloneServerPool.sentinels, "Sentinels", p)) {
+            mStandaloneServerPool.sentinelPassword = p->val;
         } else if (strcasecmp(p->key.c_str(), "Group") == 0) {
-            mSentinelServerPool.groups.push_back(ServerGroupConf{p->val});
+            mStandaloneServerPool.groups.push_back(ServerGroupConf{p->val});
             if (p->sub) {
-                auto& g = mSentinelServerPool.groups.back();
+                auto& g = mStandaloneServerPool.groups.back();
                 setServers(g.servers, "Group", p);
             }
         } else {
@@ -340,18 +344,31 @@ void Conf::setSentinelServerPool(const ConfParser::Node* node)
                     p->file, p->line, p->key.c_str());
         }
     }
-    if (mSentinelServerPool.sentinels.empty()) {
-        Throw(LogicError, "SentinelServerPool no sentinel server");
+    if (mStandaloneServerPool.groups.empty()) {
+        Throw(LogicError, "StandaloneServerPool no server group");
     }
-    if (mSentinelServerPool.groups.empty()) {
-        Throw(LogicError, "SentinelServerPool no server group");
+    if (mStandaloneServerPool.refreshMethod == ServerPoolRefreshMethod::None) {
+        Throw(LogicError, "StandaloneServerPool must define RefreshMethod");
+    } else if (mStandaloneServerPool.refreshMethod == ServerPoolRefreshMethod::Sentinel) {
+        if (mStandaloneServerPool.sentinels.empty()) {
+            Throw(LogicError, "StandaloneServerPool with RefreshMethod(sentinel) but no sentinel servers");
+        }
+    } else {
+        if (!mStandaloneServerPool.sentinels.empty()) {
+            Throw(LogicError, "StandaloneServerPool with Sentinels but RefreshMethod is not sentinel");
+        }
+        for (auto& g : mStandaloneServerPool.groups) {
+            if (g.servers.empty()) {
+                Throw(LogicError, "Group(%s) must add servers", g.name.c_str());
+            }
+        }
     }
-    if (mSentinelServerPool.groups.size() > 1) {
-        if (mSentinelServerPool.dist == Distribution::None) {
-            Throw(LogicError, "SentinelServerPool must define Dsitribution in multi groups");
+    if (mStandaloneServerPool.groups.size() > 1) {
+        if (mStandaloneServerPool.dist == Distribution::None) {
+            Throw(LogicError, "StandaloneServerPool must define Dsitribution in multi groups");
         }
-        if (mSentinelServerPool.hash == Hash::None) {
-            Throw(LogicError, "SentinelServerPool must define Hash in multi groups");
+        if (mStandaloneServerPool.hash == Hash::None) {
+            Throw(LogicError, "StandaloneServerPool must define Hash in multi groups");
         }
     }
 }
diff --git a/src/Conf.h b/src/Conf.h
index 6580344..e3fbc56 100644
--- a/src/Conf.h
+++ b/src/Conf.h
@@ -20,6 +20,7 @@
 #include "ConfParser.h"
 #include "Auth.h"
 #include "Command.h"
+#include "Enums.h"
 
 struct AuthConf
 {
@@ -63,8 +64,9 @@ struct ClusterServerPoolConf : public ServerPoolConf
     std::vector<ServerConf> servers;
 };
 
-struct SentinelServerPoolConf : public ServerPoolConf
+struct StandaloneServerPoolConf : public ServerPoolConf
 {
+    ServerPoolRefreshMethod refreshMethod = ServerPoolRefreshMethod::None;
     Distribution dist = Distribution::None;
     Hash hash = Hash::None;
     char hashTag[2];
@@ -175,9 +177,9 @@ class Conf
     {
         return mClusterServerPool;
     }
-    const SentinelServerPoolConf& sentinelServerPool() const
+    const StandaloneServerPoolConf& standaloneServerPool() const
     {
-        return mSentinelServerPool;
+        return mStandaloneServerPool;
     }
     const std::string& localDC() const
     {
@@ -198,7 +200,7 @@ class Conf
     void setGlobal(const ConfParser::Node* node);
     void setAuthority(const ConfParser::Node* node);
     void setClusterServerPool(const ConfParser::Node* node);
-    void setSentinelServerPool(const ConfParser::Node* node);
+    void setStandaloneServerPool(const ConfParser::Node* node);
     void setDataCenter(const ConfParser::Node* node);
     void check();
     bool setServerPool(ServerPoolConf& sp, const ConfParser::Node* n);
@@ -229,7 +231,7 @@ class Conf
     std::vector<AuthConf> mAuthConfs;
     int mServerPoolType;
     ClusterServerPoolConf mClusterServerPool;
-    SentinelServerPoolConf mSentinelServerPool;
+    StandaloneServerPoolConf mStandaloneServerPool;
     std::vector<DCConf> mDCConfs;
     std::string mLocalDC;
     std::vector<LatencyMonitorConf> mLatencyMonitors;
diff --git a/src/ConfParser.cpp b/src/ConfParser.cpp
index 2da48f2..512c40c 100644
--- a/src/ConfParser.cpp
+++ b/src/ConfParser.cpp
@@ -283,20 +283,22 @@ ConfParser::Status ConfParser::parse(std::string& line, std::string& key, std::s
     case SValBody:
         return KeyVal;
     case VValBody:
+    {
+        auto ret = KeyVal;
         val.assign(line, pos, line.size() - pos);
         if (val.back() == '{') {
             val.resize(val.size() - 1);
-            int vsp = 0;
-            for (auto it = val.rbegin(); it != val.rend(); ++it) {
-                if (isspace(*it)) {
-                    ++vsp;
-                }
+            ret = BeginScope;
+        }
+        int vsp = 0;
+        for (auto it = val.rbegin(); it != val.rend(); ++it) {
+            if (isspace(*it)) {
+                ++vsp;
             }
-            val.resize(val.size() - vsp);
-            return BeginScope;
-        } else {
-            return KeyVal;
         }
+        val.resize(val.size() - vsp);
+        return ret;
+    }
     case ScopeReady:
         return KeyVal;
     case ScopeBody:
diff --git a/src/Enums.cpp b/src/Enums.cpp
new file mode 100644
index 0000000..87ba358
--- /dev/null
+++ b/src/Enums.cpp
@@ -0,0 +1,15 @@
+/*
+ * predixy - A high performance and full features proxy for redis.
+ * Copyright (C) 2017 Joyield, Inc. <joyield.com@gmail.com>
+ * All rights reserved.
+ */
+
+#include "Enums.h"
+
+const ServerPoolRefreshMethod::TypeName
+ServerPoolRefreshMethod::sPairs[3] = {
+    {ServerPoolRefreshMethod::None, "none"},
+    {ServerPoolRefreshMethod::Fixed, "fixed"},
+    {ServerPoolRefreshMethod::Sentinel, "sentinel"},
+};
+
diff --git a/src/Enums.h b/src/Enums.h
new file mode 100644
index 0000000..95690ef
--- /dev/null
+++ b/src/Enums.h
@@ -0,0 +1,74 @@
+/*
+ * predixy - A high performance and full features proxy for redis.
+ * Copyright (C) 2017 Joyield, Inc. <joyield.com@gmail.com>
+ * All rights reserved.
+ */
+
+#ifndef _PREDIXY_ENUMS_H_
+#define _PREDIXY_ENUMS_H_
+
+#include <string.h>
+#include <strings.h>
+#include "Exception.h"
+
+template<class T>
+class EnumBase
+{
+public:
+    DefException(InvalidEnumValue);
+    struct TypeName
+    {
+        int type;
+        const char* name;
+    };
+public:
+    EnumBase(int t):
+        mType(t)
+    {
+    }
+    int value() const
+    {
+        return mType;
+    }
+    bool operator==(const T& t) const
+    {
+        return t.value() == mType;
+    }
+    bool operator!=(const T& t) const
+    {
+        return t.value() != mType;
+    }
+    const char* name() const
+    {
+        return T::sPairs[mType].name;
+    }
+    static T parse(const char* str)
+    {
+        for (auto& i : T::sPairs) {
+            if (strcasecmp(i.name, str) == 0) {
+                return T(typename T::Type(i.type));
+            }
+        }
+        Throw(InvalidEnumValue, "invalid enum value:%s", str);
+    }
+protected:
+    int mType;
+};
+
+class ServerPoolRefreshMethod : public EnumBase<ServerPoolRefreshMethod>
+{
+public:
+    enum Type
+    {
+        None,
+        Fixed,
+        Sentinel
+    };
+    static const TypeName sPairs[3];
+    ServerPoolRefreshMethod(Type t = None):
+        EnumBase<ServerPoolRefreshMethod>(t)
+    {
+    }
+};
+
+#endif
diff --git a/src/Makefile b/src/Makefile
index 18055de..46b6787 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -72,6 +72,7 @@ objs = \
 	 Buffer.o \
 	 Command.o \
 	 Distribution.o \
+	 Enums.o \
 	 Reply.o \
 	 ConfParser.o \
 	 Conf.o \
@@ -87,7 +88,7 @@ objs = \
 	 ServerPool.o \
 	 ClusterNodesParser.o \
 	 ClusterServerPool.o \
-	 SentinelServerPool.o \
+	 StandaloneServerPool.o \
 	 ConnectConnectionPool.o \
 	 Handler.o \
 	 Proxy.o \
diff --git a/src/Proxy.cpp b/src/Proxy.cpp
index eb42f7b..3ee0842 100644
--- a/src/Proxy.cpp
+++ b/src/Proxy.cpp
@@ -118,10 +118,10 @@ bool Proxy::init(int argc, char* argv[])
             mServPool = p;
         }
         break;
-    case ServerPool::Sentinel:
+    case ServerPool::Standalone:
         {
-            SentinelServerPool* p = new SentinelServerPool(this);
-            p->init(mConf->sentinelServerPool());
+            StandaloneServerPool* p = new StandaloneServerPool(this);
+            p->init(mConf->standaloneServerPool());
             mServPool = p;
         }
         break;
diff --git a/src/Proxy.h b/src/Proxy.h
index 35d2a07..afff0dc 100644
--- a/src/Proxy.h
+++ b/src/Proxy.h
@@ -13,7 +13,7 @@
 #include "DC.h"
 #include "ServerPool.h"
 #include "ClusterServerPool.h"
-#include "SentinelServerPool.h"
+#include "StandaloneServerPool.h"
 #include "LatencyMonitor.h"
 
 class Proxy
@@ -51,15 +51,15 @@ class Proxy
     }
     bool isSplitMultiKey() const
     {
-        return mConf->sentinelServerPool().groups.size() != 1;
+        return mConf->standaloneServerPool().groups.size() != 1;
     }
     bool supportTransaction() const
     {
-        return mConf->sentinelServerPool().groups.size() == 1;
+        return mConf->standaloneServerPool().groups.size() == 1;
     }
     bool supportSubscribe() const
     {
-        return mConf->sentinelServerPool().groups.size() == 1 ||
+        return mConf->standaloneServerPool().groups.size() == 1 ||
                mConf->clusterServerPool().servers.size() > 0;
     }
     const std::vector<Handler*>& handlers() const
diff --git a/src/ServerPool.h b/src/ServerPool.h
index 4c12cb0..c41fe17 100644
--- a/src/ServerPool.h
+++ b/src/ServerPool.h
@@ -20,7 +20,7 @@ class ServerPool
     {
         Unknown,
         Cluster,
-        Sentinel
+        Standalone
     };
     static const int DefaultServerRetryTimeout = 10000000;
     static const int DefaultRefreshInterval = 1000000;
diff --git a/src/StandaloneServerPool.cpp b/src/StandaloneServerPool.cpp
new file mode 100644
index 0000000..1e57367
--- /dev/null
+++ b/src/StandaloneServerPool.cpp
@@ -0,0 +1,482 @@
+/*
+ * predixy - A high performance and full features proxy for redis.
+ * Copyright (C) 2017 Joyield, Inc. <joyield.com@gmail.com>
+ * All rights reserved.
+ */
+
+#include <algorithm>
+#include "Logger.h"
+#include "ServerGroup.h"
+#include "Handler.h"
+#include "StandaloneServerPool.h"
+
+StandaloneServerPool::StandaloneServerPool(Proxy* p):
+    ServerPoolTmpl(p, Standalone),
+    mDist(Distribution::Modula)
+{
+    mSentinels.reserve(MaxSentinelNum);
+    mServPool.reserve(Const::MaxServNum);
+    mHashTag[0] = mHashTag[1] = '\0';
+}
+
+StandaloneServerPool::~StandaloneServerPool()
+{
+}
+
+void StandaloneServerPool::init(const StandaloneServerPoolConf& conf)
+{
+    ServerPool::init(conf);
+    mRefreshMethod = conf.refreshMethod;
+    mDist = conf.dist;
+    mHash = conf.hash;
+    mHashTag[0] = conf.hashTag[0];
+    mHashTag[1] = conf.hashTag[1];
+    int i = 0;
+    if (conf.refreshMethod == ServerPoolRefreshMethod::Sentinel) {
+        mSentinels.resize(conf.sentinels.size());
+        for (auto& sc : conf.sentinels) {
+            Server* s = new Server(this, sc.addr, true);
+            s->setRole(Server::Sentinel);
+            s->setPassword(sc.password.empty() ? conf.sentinelPassword:sc.password);
+            mSentinels[i++] = s;
+            mServs[s->addr()] = s;
+        }
+    }
+    mGroupPool.resize(conf.groups.size());
+    i = 0;
+    for (auto& gc : conf.groups) {
+        ServerGroup* g = new ServerGroup(this, gc.name);
+        mGroupPool[i++] = g;
+        auto role = Server::Master;
+        for (auto& sc : gc.servers) {
+            Server* s = new Server(this, sc.addr, true);
+            s->setPassword(sc.password.empty() ? conf.password : sc.password);
+            mServPool.push_back(s);
+            mServs[s->addr()] = s;
+            g->add(s);
+            s->setGroup(g);
+            switch (mRefreshMethod.value()) {
+            case ServerPoolRefreshMethod::Fixed:
+                s->setOnline(true);
+                s->setRole(role);
+                role = Server::Slave;
+                break;
+            default:
+                s->setOnline(false);
+                break;
+            }
+        }
+    }
+}
+
+Server* StandaloneServerPool::getServer(Handler* h, Request* req, const String& key) const
+{
+    FuncCallTimer();
+    switch (req->type()) {
+    case Command::SentinelGetMaster:
+    case Command::SentinelSlaves:
+    case Command::SentinelSentinels:
+        if (mSentinels.empty()) {
+            return nullptr;
+        } else  {
+            Server* s = randServer(h, mSentinels);
+            logDebug("sentinel server pool get server %s for sentinel command",
+                     s->addr().data());
+            return s;
+        }
+        break;
+    case Command::Randomkey:
+        return randServer(h, mServPool);
+    default:
+        break;
+    }
+    if (mGroupPool.size() == 1) {
+        return mGroupPool[0]->getServer(h, req);
+    } else if (mGroupPool.size() > 1) {
+        switch (mDist) {
+        case Distribution::Modula:
+            {
+                long idx = mHash.hash(key.data(), key.length(), mHashTag);
+                idx %= mGroupPool.size();
+                return mGroupPool[idx]->getServer(h, req);
+            }
+            break;
+        case Distribution::Random:
+            {
+                int idx = h->rand() % mGroupPool.size();
+                return mGroupPool[idx]->getServer(h, req);
+            }
+            break;
+        default:
+            break;
+        }
+    }
+    return nullptr;
+}
+
+void StandaloneServerPool::refreshRequest(Handler* h)
+{
+    logDebug("h %d update standalone server pool", h->id());
+    switch (mRefreshMethod.value()) {
+    case ServerPoolRefreshMethod::Sentinel:
+        for (auto g : mGroupPool) {
+            RequestPtr req = RequestAlloc::create();
+            req->setSentinels(g->name());
+            req->setData(g);
+            h->handleRequest(req);
+            req = RequestAlloc::create();
+            req->setSentinelGetMaster(g->name());
+            req->setData(g);
+            h->handleRequest(req);
+            req = RequestAlloc::create();
+            req->setSentinelSlaves(g->name());
+            req->setData(g);
+            h->handleRequest(req);
+        }
+        break;
+    default:
+        break;
+    }
+}
+
+void StandaloneServerPool::handleResponse(Handler* h, ConnectConnection* s, Request* req, Response* res)
+{
+    switch (req->type()) {
+    case Command::SentinelSentinels:
+        handleSentinels(h, s, req, res);
+        break;
+    case Command::SentinelGetMaster:
+        handleGetMaster(h, s, req, res);
+        break;
+    case Command::SentinelSlaves:
+        handleSlaves(h, s, req, res);
+        break;
+    default:
+        break;
+    }
+}
+
+class AddrParser
+{
+public:
+    enum Status {
+        Ok,
+        Error,
+        Done
+    };
+public:
+    AddrParser(const Segment& res):
+        mRes(res),
+        mState(Idle),
+        mCnt(0),
+        mArgLen(0),
+        mIp(false),
+        mPort(false)
+    {
+        mRes.rewind();
+    }
+    int count() const {return mCnt;}
+    Status parse(SString<Const::MaxAddrLen>& addr);
+private:
+    enum State {
+        Idle,
+        Count,
+        CountLF,
+        Arg,
+        ArgLen,
+        ArgLenLF,
+        SubArrayLen,
+        Body,
+        BodyLF,
+        Invalid,
+        Finished
+    };
+private:
+    Segment mRes;
+    State mState;
+    int mCnt;
+    int mArgLen;
+    bool mIp;
+    bool mPort;
+    SString<4> mKey;
+};
+
+AddrParser::Status AddrParser::parse(SString<Const::MaxAddrLen>& addr)
+{
+    const char* dat;
+    int len;
+    addr.clear();
+    while (mRes.get(dat, len) && mState != Invalid) {
+        for (int i = 0; i < len && mState != Invalid; ++i) {
+            char ch = dat[i];
+            switch (mState) {
+            case Idle:
+                mState = ch == '*' ? Count : Invalid;
+                break;
+            case Count:
+                if (ch >= '0' && ch <= '9') {
+                    mCnt = mCnt * 10 + (ch - '0');
+                } else if (ch == '\r') {
+                    if (mCnt == 0) {
+                        mState = Finished;
+                        return Done;
+                    } else if (mCnt < 0) {
+                        mState = Invalid;
+                        return Error;
+                    }
+                    mState = CountLF;
+                } else {
+                    mState = Invalid;
+                }
+                break;
+            case CountLF:
+                mState = ch == '\n' ? Arg : Invalid;
+                break;
+            case Arg:
+                if (ch == '$') {
+                    mState = ArgLen;
+                    mArgLen = 0;
+                } else if (ch == '*') {
+                    mState = SubArrayLen;
+                } else {
+                    mState = Invalid;
+                }
+                break;
+            case ArgLen:
+                if (ch >= '0' && ch <= '9') {
+                    mArgLen = mArgLen * 10 + (ch - '0');
+                } else if (ch == '\r') {
+                    mState = ArgLenLF;
+                } else {
+                    mState = Invalid;
+                }
+                break;
+            case ArgLenLF:
+                mState = ch == '\n' ? Body : Invalid;
+                break;
+            case SubArrayLen:
+                if (ch == '\n') {
+                    mState = Arg;
+                }
+                break;
+            case Body:
+                if (ch == '\r') {
+                    mState = BodyLF;
+                    if (mPort) {
+                        mPort = false;
+                        mRes.use(i + 1);
+                        return Ok;
+                    } else if (mIp) {
+                        mIp = false;
+                        addr.append(':');
+                    } else if (mArgLen == 2 && strcmp(mKey.data(), "ip") == 0) {
+                        mIp = true;
+                    } else if (mArgLen == 4 && strcmp(mKey.data(), "port") == 0) {
+                        mPort = true;
+                    }
+                    break;
+                }
+                if (mIp || mPort) {
+                    addr.append(ch);
+                } else if (mArgLen == 2 || mArgLen == 4) {
+                    mKey.append(ch);
+                }
+                break;
+            case BodyLF:
+                mKey.clear();
+                mState = ch == '\n' ? Arg : Invalid;
+                break;
+            default:
+                break;
+            }
+        }
+        mRes.use(len);
+    }
+    return mState != Invalid ? Done : Error;
+}
+
+static bool hasValidPort(const String& addr)
+{
+    const char* p = addr.data() + addr.length();
+    for (int i = 0; i < addr.length(); ++i) {
+        if (*(--p) == ':') {
+            int port = atoi(p + 1);
+            return port > 0 && port < 65536;
+        }
+    }
+    return false;
+}
+
+void StandaloneServerPool::handleSentinels(Handler* h, ConnectConnection* s, Request* req, Response* res)
+{
+    if (!res || !res->isArray()) {
+        return;
+    }
+    AddrParser parser(res->body());
+    SString<Const::MaxAddrLen> addr;
+    while (true) {
+        auto st = parser.parse(addr);
+        if (st == AddrParser::Ok) {
+            logDebug("sentinel server pool parse sentinel %s", addr.data());
+            if (!hasValidPort(addr)) {
+                logNotice("sentinel server pool parse sentienl %s invalid",
+                        addr.data());
+                continue;
+            }
+            auto it = mServs.find(addr);
+            Server* serv = it == mServs.end() ? nullptr : it->second;
+            if (!serv) {
+                if (mSentinels.size() == mSentinels.capacity()) {
+                    logWarn("too many sentinels %d, will ignore new sentinel %s",
+                            (int)mSentinels.size(), addr.data());
+                    continue;
+                }
+                serv = new Server(this, addr, false);
+                serv->setRole(Server::Sentinel);
+                serv->setPassword(password());
+                mSentinels.push_back(serv);
+                mServs[serv->addr()] = serv;
+                logNotice("h %d create new sentinel %s",
+                        h->id(), addr.data());
+            }
+            serv->setOnline(true);
+        } else if (st == AddrParser::Done) {
+            break;
+        } else {
+            logError("sentinel server pool parse sentinel sentinels error");
+            break;
+        }
+    }
+}
+
+void StandaloneServerPool::handleGetMaster(Handler* h, ConnectConnection* s, Request* req, Response* res)
+{
+    if (!res || !res->isArray()) {
+        return;
+    }
+    ServerGroup* g = (ServerGroup*)req->data();
+    if (!g) {
+        return;
+    }
+    SegmentStr<Const::MaxAddrLen + 32> str(res->body());
+    if (!str.complete()) {
+        return;
+    }
+    if (strncmp(str.data(), "*2\r\n$", 5) != 0) {
+        return;
+    }
+    SString<Const::MaxAddrLen> addr;
+    const char* p = str.data() + 5;
+    int len = atoi(p);
+    if (len <= 0) {
+        return;
+    }
+    p = strchr(p, '\r') + 2;
+    if (!addr.append(p, len)) {
+        return;
+    }
+    if (!addr.append(':')) {
+        return;
+    }
+    p += len + 3;
+    len = atoi(p);
+    if (len <= 0) {
+        return;
+    }
+    p = strchr(p, '\r') + 2;
+    if (!addr.append(p, len)) {
+        return;
+    }
+    logDebug("sentinel server pool group %s get master %s",
+             g->name().data(), addr.data());
+    auto it = mServs.find(addr);
+    Server* serv = it == mServs.end() ? nullptr : it->second;
+    if (serv) {
+        serv->setOnline(true);
+        serv->setRole(Server::Master);
+        auto old = serv->group();
+        if (old) {
+            if (old != g) {
+                old->remove(serv);
+                g->add(serv);
+                serv->setGroup(g);
+            }
+        } else {
+            g->add(serv);
+            serv->setGroup(g);
+        }
+    } else {
+        if (mServPool.size() == mServPool.capacity()) {
+            logWarn("too many servers %d, will ignore new master server %s",
+                     (int)mServPool.size(), addr.data());
+            return;
+        }
+        serv = new Server(this, addr, false);
+        serv->setRole(Server::Master);
+        serv->setPassword(password());
+        mServPool.push_back(serv);
+        g->add(serv);
+        serv->setGroup(g);
+        mServs[serv->addr()] = serv;
+        logNotice("sentinel server pool group %s create master server %s %s",
+                  g->name().data(), addr.data(), serv->dcName().data());
+    }
+}
+
+void StandaloneServerPool::handleSlaves(Handler* h, ConnectConnection* s, Request* req, Response* res)
+{
+    if (!res || !res->isArray()) {
+        return;
+    }
+    ServerGroup* g = (ServerGroup*)req->data();
+    if (!g) {
+        return;
+    }
+    AddrParser parser(res->body());
+    SString<Const::MaxAddrLen> addr;
+    while (true) {
+        auto st = parser.parse(addr);
+        if (st == AddrParser::Ok) {
+            logDebug("sentinel server pool group %s parse slave %s",
+                     g->name().data(), addr.data());
+            auto it = mServs.find(addr);
+            Server* serv = it == mServs.end() ? nullptr : it->second;
+            if (serv) {
+                serv->setOnline(true);
+                serv->setRole(Server::Slave);
+                auto old = serv->group();
+                if (old) {
+                    if (old != g) {
+                        old->remove(serv);
+                        g->add(serv);
+                        serv->setGroup(g);
+                    }
+                } else {
+                    g->add(serv);
+                    serv->setGroup(g);
+                }
+            } else {
+                if (mServPool.size() == mServPool.capacity()) {
+                    logWarn("too many servers %d, will ignore new slave server %s",
+                            (int)mServPool.size(), addr.data());
+                    return;
+                }
+                serv = new Server(this, addr, false);
+                serv->setRole(Server::Slave);
+                serv->setPassword(password());
+                mServPool.push_back(serv);
+                g->add(serv);
+                serv->setGroup(g);
+                mServs[serv->addr()] = serv;
+                logNotice("sentinel server pool group %s create slave server %s %s",
+                          g->name().data(), addr.data(), serv->dcName().data());
+            }
+        } else if (st == AddrParser::Done) {
+            break;
+        } else {
+            logError("sentinel server pool group %s parse sentinel sentinels error",
+                    g->name().data());
+            break;
+        }
+    }
+}
diff --git a/src/StandaloneServerPool.h b/src/StandaloneServerPool.h
new file mode 100644
index 0000000..9f952aa
--- /dev/null
+++ b/src/StandaloneServerPool.h
@@ -0,0 +1,43 @@
+/*
+ * predixy - A high performance and full features proxy for redis.
+ * Copyright (C) 2017 Joyield, Inc. <joyield.com@gmail.com>
+ * All rights reserved.
+ */
+
+#ifndef _PREDIXY_STANDALONE_SERVER_POOL_H_
+#define _PREDIXY_STANDALONE_SERVER_POOL_H_
+
+#include <map>
+#include "Predixy.h"
+#include "ServerPool.h"
+
+class StandaloneServerPool : public ServerPoolTmpl<StandaloneServerPool>
+{
+public:
+    static const int MaxSentinelNum = 64;
+public:
+    StandaloneServerPool(Proxy* p);
+    ~StandaloneServerPool();
+    void init(const StandaloneServerPoolConf& conf);
+    Server* getServer(Handler* h, Request* req, const String& key) const;
+    Server* iter(int& cursor) const
+    {
+        return ServerPool::iter(mServPool, cursor);
+    }
+    void refreshRequest(Handler* h);
+    void handleResponse(Handler* h, ConnectConnection* s, Request* req, Response* res);
+private:
+    void handleSentinels(Handler* h, ConnectConnection* s, Request* req, Response* res);
+    void handleGetMaster(Handler* h, ConnectConnection* s, Request* req, Response* res);
+    void handleSlaves(Handler* h, ConnectConnection* s, Request* req, Response* res);
+    friend class ServerPoolTmpl<StandaloneServerPool>;
+private:
+    ServerPoolRefreshMethod mRefreshMethod;
+    std::vector<Server*> mSentinels;
+    std::vector<Server*> mServPool;
+    Distribution mDist;
+    Hash mHash;
+    char mHashTag[2];
+};
+
+#endif