Merge pull request #795 from fatedier/lb

support lb

README.md

@@ -35,6 +35,7 @@ frp is a fast reverse proxy to help you expose a local server behind a NAT or fi
     * [TCP Stream Multiplexing](#tcp-stream-multiplexing)
     * [Support KCP Protocol](#support-kcp-protocol)
     * [Connection Pool](#connection-pool)
+    * [Load balancing](#load-balancing)
     * [Rewriting the Host Header](#rewriting-the-host-header)
     * [Set Headers In HTTP Request](#set-headers-in-http-request)
     * [Get Real IP](#get-real-ip)
@@ -484,6 +485,32 @@ This feature is fit for a large number of short connections.
   pool_count = 1
   ```
 
+### Load balancing
+
+Load balancing is supported by `group`.
+This feature is available only for type `tcp` now.
+
+```ini
+# frpc.ini
+[test1]
+type = tcp
+local_port = 8080
+remote_port = 80
+group = web
+group_key = 123
+
+[test2]
+type = tcp
+local_port = 8081
+remote_port = 80
+group = web
+group_key = 123
+```
+
+`group_key` is used for authentication.
+
+Proxies in same group will accept connections from port 80 randomly.
+
 ### Rewriting the Host Header
 
 When forwarding to a local port, frp does not modify the tunneled HTTP requests at all, they are copied to your server byte-for-byte as they are received. Some application servers use the Host header for determining which development site to display. For this reason, frp can rewrite your requests with a modified host header. Use the `host_header_rewrite` switch to rewrite incoming HTTP requests.
@@ -644,7 +671,6 @@ plugin_http_passwd = abc
 
 * Log http request information in frps.
 * Direct reverse proxy, like haproxy.
-* Load balance to different service in frpc.
 * kubernetes ingress support.
 
 ## Contributing

README_zh.md

@@ -33,8 +33,9 @@ frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp
     * [TCP 多路复用](#tcp-多路复用)
     * [底层通信可选 kcp 协议](#底层通信可选-kcp-协议)
     * [连接池](#连接池)
+    * [负载均衡](#负载均衡)
     * [修改 Host Header](#修改-host-header)
-    * [设置 http 请求的 header](#设置-http-请求的-header)
+    * [设置 HTTP 请求的 header](#设置-http-请求的-header)
     * [获取用户真实 IP](#获取用户真实-ip)
     * [通过密码保护你的 web 服务](#通过密码保护你的-web-服务)
     * [自定义二级域名](#自定义二级域名)
@@ -511,6 +512,32 @@ tcp_mux = false
   pool_count = 1
   ```
 
+### 负载均衡
+
+可以将多个相同类型的 proxy 加入到同一个 group 中，从而实现负载均衡的功能。
+目前只支持 tcp 类型的 proxy。
+
+```ini
+# fprc.ini
+[test1]
+type = tcp
+local_port = 8080
+remote_port = 80
+group = web
+group_key = 123
+
+[test2]
+type = tcp
+local_port = 8081
+remote_port = 80
+group = web
+group_key = 123
+```
+
+用户连接 frps 服务器的 80 端口，frps 会将接收到的用户连接随机分发给其中一个存活的 proxy。这样可以在一台 frpc 机器挂掉后仍然有其他节点能够提供服务。
+
+要求 `group_key` 相同，做权限验证，且 `remote_port` 相同。
+
 ### 修改 Host Header
 
 通常情况下 frp 不会修改转发的任何数据。但有一些后端服务会根据 http 请求 header 中的 host 字段来展现不同的网站，例如 nginx 的虚拟主机服务，启用 host-header 的修改功能可以动态修改 http 请求中的 host 字段。该功能仅限于 http 类型的代理。
@@ -526,7 +553,7 @@ host_header_rewrite = dev.yourdomain.com
 
 原来 http 请求中的 host 字段 `test.yourdomain.com` 转发到后端服务时会被替换为 `dev.yourdomain.com`。
 
-### 设置 http 请求的 header
+### 设置 HTTP 请求的 header
 
 对于 `type = http` 的代理，可以设置在转发中动态添加的 header 参数。
 
@@ -684,7 +711,6 @@ plugin_http_passwd = abc
 
 * frps 记录 http 请求日志。
 * frps 支持直接反向代理，类似 haproxy。
-* frpc 支持负载均衡到后端不同服务。
 * 集成对 k8s 等平台的支持。
 
 ## 为 frp 做贡献

conf/frpc_full.ini

@@ -45,7 +45,7 @@ login_fail_exit = true
 protocol = tcp
 
 # specify a dns server, so frpc will use this instead of default one
-dns_server = 8.8.8.8
+# dns_server = 8.8.8.8
 
 # proxy names you want to start divided by ','
 # default is empty, means all proxies
@@ -69,6 +69,10 @@ use_encryption = false
 use_compression = false
 # remote port listen by frps
 remote_port = 6001
+# frps will load balancing connections for proxies in same group
+group = test_group
+# group should have same group key
+group_key = 123456
 
 [ssh_random]
 type = tcp

models/config/proxy.go

@@ -100,8 +100,10 @@ type BaseProxyConf struct {
 	ProxyName string `json:"proxy_name"`
 	ProxyType string `json:"proxy_type"`
 
-	UseEncryption  bool `json:"use_encryption"`
-	UseCompression bool `json:"use_compression"`
+	UseEncryption  bool   `json:"use_encryption"`
+	UseCompression bool   `json:"use_compression"`
+	Group          string `json:"group"`
+	GroupKey       string `json:"group_key"`
 }
 
 func (cfg *BaseProxyConf) GetBaseInfo() *BaseProxyConf {
@@ -112,7 +114,9 @@ func (cfg *BaseProxyConf) compare(cmp *BaseProxyConf) bool {
 	if cfg.ProxyName != cmp.ProxyName ||
 		cfg.ProxyType != cmp.ProxyType ||
 		cfg.UseEncryption != cmp.UseEncryption ||
-		cfg.UseCompression != cmp.UseCompression {
+		cfg.UseCompression != cmp.UseCompression ||
+		cfg.Group != cmp.Group ||
+		cfg.GroupKey != cmp.GroupKey {
 		return false
 	}
 	return true
@@ -123,6 +127,8 @@ func (cfg *BaseProxyConf) UnmarshalFromMsg(pMsg *msg.NewProxy) {
 	cfg.ProxyType = pMsg.ProxyType
 	cfg.UseEncryption = pMsg.UseEncryption
 	cfg.UseCompression = pMsg.UseCompression
+	cfg.Group = pMsg.Group
+	cfg.GroupKey = pMsg.GroupKey
 }
 
 func (cfg *BaseProxyConf) UnmarshalFromIni(prefix string, name string, section ini.Section) error {
@@ -142,6 +148,9 @@ func (cfg *BaseProxyConf) UnmarshalFromIni(prefix string, name string, section i
 	if ok && tmpStr == "true" {
 		cfg.UseCompression = true
 	}
+
+	cfg.Group = section["group"]
+	cfg.GroupKey = section["group_key"]
 	return nil
 }
 
@@ -150,6 +159,8 @@ func (cfg *BaseProxyConf) MarshalToMsg(pMsg *msg.NewProxy) {
 	pMsg.ProxyType = cfg.ProxyType
 	pMsg.UseEncryption = cfg.UseEncryption
 	pMsg.UseCompression = cfg.UseCompression
+	pMsg.Group = cfg.Group
+	pMsg.GroupKey = cfg.GroupKey
 }
 
 // Bind info

models/msg/msg.go

@@ -86,6 +86,8 @@ type NewProxy struct {
 	ProxyType      string `json:"proxy_type"`
 	UseEncryption  bool   `json:"use_encryption"`
 	UseCompression bool   `json:"use_compression"`
+	Group          string `json:"group"`
+	GroupKey       string `json:"group_key"`
 
 	// tcp and udp only
 	RemotePort int `json:"remote_port"`

server/group/group.go

@@ -0,0 +1,25 @@
+// Copyright 2018 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package group
+
+import (
+	"errors"
+)
+
+var (
+	ErrGroupAuthFailed    = errors.New("group auth failed")
+	ErrGroupParamsInvalid = errors.New("group params invalid")
+	ErrListenerClosed     = errors.New("group listener closed")
+)

server/group/tcp.go

@@ -0,0 +1,200 @@
+// Copyright 2018 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package group
+
+import (
+	"fmt"
+	"net"
+	"sync"
+
+	"github.com/fatedier/frp/server/ports"
+
+	gerr "github.com/fatedier/golib/errors"
+)
+
+type TcpGroupListener struct {
+	groupName string
+	group     *TcpGroup
+
+	addr    net.Addr
+	closeCh chan struct{}
+}
+
+func newTcpGroupListener(name string, group *TcpGroup, addr net.Addr) *TcpGroupListener {
+	return &TcpGroupListener{
+		groupName: name,
+		group:     group,
+		addr:      addr,
+		closeCh:   make(chan struct{}),
+	}
+}
+
+func (ln *TcpGroupListener) Accept() (c net.Conn, err error) {
+	var ok bool
+	select {
+	case <-ln.closeCh:
+		return nil, ErrListenerClosed
+	case c, ok = <-ln.group.Accept():
+		if !ok {
+			return nil, ErrListenerClosed
+		}
+		return c, nil
+	}
+}
+
+func (ln *TcpGroupListener) Addr() net.Addr {
+	return ln.addr
+}
+
+func (ln *TcpGroupListener) Close() (err error) {
+	close(ln.closeCh)
+	ln.group.CloseListener(ln)
+	return
+}
+
+type TcpGroup struct {
+	group    string
+	groupKey string
+	addr     string
+	port     int
+	realPort int
+
+	acceptCh chan net.Conn
+	index    uint64
+	tcpLn    net.Listener
+	lns      []*TcpGroupListener
+	ctl      *TcpGroupCtl
+	mu       sync.Mutex
+}
+
+func NewTcpGroup(ctl *TcpGroupCtl) *TcpGroup {
+	return &TcpGroup{
+		lns:      make([]*TcpGroupListener, 0),
+		ctl:      ctl,
+		acceptCh: make(chan net.Conn),
+	}
+}
+
+func (tg *TcpGroup) Listen(proxyName string, group string, groupKey string, addr string, port int) (ln *TcpGroupListener, realPort int, err error) {
+	tg.mu.Lock()
+	defer tg.mu.Unlock()
+	if len(tg.lns) == 0 {
+		realPort, err = tg.ctl.portManager.Acquire(proxyName, port)
+		if err != nil {
+			return
+		}
+		tcpLn, errRet := net.Listen("tcp", fmt.Sprintf("%s:%d", addr, port))
+		if errRet != nil {
+			err = errRet
+			return
+		}
+		ln = newTcpGroupListener(group, tg, tcpLn.Addr())
+
+		tg.group = group
+		tg.groupKey = groupKey
+		tg.addr = addr
+		tg.port = port
+		tg.realPort = realPort
+		tg.tcpLn = tcpLn
+		tg.lns = append(tg.lns, ln)
+		if tg.acceptCh == nil {
+			tg.acceptCh = make(chan net.Conn)
+		}
+		go tg.worker()
+	} else {
+		if tg.group != group || tg.addr != addr || tg.port != port {
+			err = ErrGroupParamsInvalid
+			return
+		}
+		if tg.groupKey != groupKey {
+			err = ErrGroupAuthFailed
+			return
+		}
+		ln = newTcpGroupListener(group, tg, tg.lns[0].Addr())
+		realPort = tg.realPort
+		tg.lns = append(tg.lns, ln)
+	}
+	return
+}
+
+func (tg *TcpGroup) worker() {
+	for {
+		c, err := tg.tcpLn.Accept()
+		if err != nil {
+			return
+		}
+		err = gerr.PanicToError(func() {
+			tg.acceptCh <- c
+		})
+		if err != nil {
+			return
+		}
+	}
+}
+
+func (tg *TcpGroup) Accept() <-chan net.Conn {
+	return tg.acceptCh
+}
+
+func (tg *TcpGroup) CloseListener(ln *TcpGroupListener) {
+	tg.mu.Lock()
+	defer tg.mu.Unlock()
+	for i, tmpLn := range tg.lns {
+		if tmpLn == ln {
+			tg.lns = append(tg.lns[:i], tg.lns[i+1:]...)
+			break
+		}
+	}
+	if len(tg.lns) == 0 {
+		close(tg.acceptCh)
+		tg.tcpLn.Close()
+		tg.ctl.portManager.Release(tg.realPort)
+		tg.ctl.RemoveGroup(tg.group)
+	}
+}
+
+type TcpGroupCtl struct {
+	groups map[string]*TcpGroup
+
+	portManager *ports.PortManager
+	mu          sync.Mutex
+}
+
+func NewTcpGroupCtl(portManager *ports.PortManager) *TcpGroupCtl {
+	return &TcpGroupCtl{
+		groups:      make(map[string]*TcpGroup),
+		portManager: portManager,
+	}
+}
+
+func (tgc *TcpGroupCtl) Listen(proxyNanme string, group string, groupKey string,
+	addr string, port int) (l net.Listener, realPort int, err error) {
+
+	tgc.mu.Lock()
+	defer tgc.mu.Unlock()
+	if tcpGroup, ok := tgc.groups[group]; ok {
+		return tcpGroup.Listen(proxyNanme, group, groupKey, addr, port)
+	} else {
+		tcpGroup = NewTcpGroup(tgc)
+		tgc.groups[group] = tcpGroup
+		return tcpGroup.Listen(proxyNanme, group, groupKey, addr, port)
+	}
+}
+
+func (tgc *TcpGroupCtl) RemoveGroup(group string) {
+	tgc.mu.Lock()
+	defer tgc.mu.Unlock()
+	delete(tgc.groups, group)
+}

server/ports.go → server/ports/ports.go

@@ -1,4 +1,4 @@
-package server
+package ports
 
 import (
 	"errors"

server/proxy.go

@@ -181,27 +181,44 @@ type TcpProxy struct {
 }
 
 func (pxy *TcpProxy) Run() (remoteAddr string, err error) {
-	pxy.realPort, err = pxy.ctl.svr.tcpPortManager.Acquire(pxy.name, pxy.cfg.RemotePort)
-	if err != nil {
-		return
-	}
-	defer func() {
+	if pxy.cfg.Group != "" {
+		l, realPort, errRet := pxy.ctl.svr.tcpGroupCtl.Listen(pxy.name, pxy.cfg.Group, pxy.cfg.GroupKey, g.GlbServerCfg.ProxyBindAddr, pxy.cfg.RemotePort)
+		if errRet != nil {
+			err = errRet
+			return
+		}
+		defer func() {
+			if err != nil {
+				l.Close()
+			}
+		}()
+		pxy.realPort = realPort
+		listener := frpNet.WrapLogListener(l)
+		listener.AddLogPrefix(pxy.name)
+		pxy.listeners = append(pxy.listeners, listener)
+		pxy.Info("tcp proxy listen port [%d] in group [%s]", pxy.cfg.RemotePort, pxy.cfg.Group)
+	} else {
+		pxy.realPort, err = pxy.ctl.svr.tcpPortManager.Acquire(pxy.name, pxy.cfg.RemotePort)
 		if err != nil {
-			pxy.ctl.svr.tcpPortManager.Release(pxy.realPort)
+			return
 		}
-	}()
-
-	remoteAddr = fmt.Sprintf(":%d", pxy.realPort)
-	pxy.cfg.RemotePort = pxy.realPort
-	listener, errRet := frpNet.ListenTcp(g.GlbServerCfg.ProxyBindAddr, pxy.realPort)
-	if errRet != nil {
-		err = errRet
-		return
+		defer func() {
+			if err != nil {
+				pxy.ctl.svr.tcpPortManager.Release(pxy.realPort)
+			}
+		}()
+		listener, errRet := frpNet.ListenTcp(g.GlbServerCfg.ProxyBindAddr, pxy.realPort)
+		if errRet != nil {
+			err = errRet
+			return
+		}
+		listener.AddLogPrefix(pxy.name)
+		pxy.listeners = append(pxy.listeners, listener)
+		pxy.Info("tcp proxy listen port [%d]", pxy.cfg.RemotePort)
 	}
-	listener.AddLogPrefix(pxy.name)
-	pxy.listeners = append(pxy.listeners, listener)
-	pxy.Info("tcp proxy listen port [%d]", pxy.cfg.RemotePort)
 
+	pxy.cfg.RemotePort = pxy.realPort
+	remoteAddr = fmt.Sprintf(":%d", pxy.realPort)
 	pxy.startListenHandler(pxy, HandleUserTcpConnection)
 	return
 }
@@ -212,7 +229,9 @@ func (pxy *TcpProxy) GetConf() config.ProxyConf {
 
 func (pxy *TcpProxy) Close() {
 	pxy.BaseProxy.Close()
-	pxy.ctl.svr.tcpPortManager.Release(pxy.realPort)
+	if pxy.cfg.Group == "" {
+		pxy.ctl.svr.tcpPortManager.Release(pxy.realPort)
+	}
 }
 
 type HttpProxy struct {

server/service.go

@@ -24,6 +24,8 @@ import (
 	"github.com/fatedier/frp/assets"
 	"github.com/fatedier/frp/g"
 	"github.com/fatedier/frp/models/msg"
+	"github.com/fatedier/frp/server/group"
+	"github.com/fatedier/frp/server/ports"
 	"github.com/fatedier/frp/utils/log"
 	frpNet "github.com/fatedier/frp/utils/net"
 	"github.com/fatedier/frp/utils/util"
@@ -40,38 +42,41 @@ const (
 
 var ServerService *Service
 
-// Server service.
+// Server service
 type Service struct {
-	// Dispatch connections to different handlers listen on same port.
+	// Dispatch connections to different handlers listen on same port
 	muxer *mux.Mux
 
-	// Accept connections from client.
+	// Accept connections from client
 	listener frpNet.Listener
 
-	// Accept connections using kcp.
+	// Accept connections using kcp
 	kcpListener frpNet.Listener
 
-	// For https proxies, route requests to different clients by hostname and other infomation.
+	// For https proxies, route requests to different clients by hostname and other infomation
 	VhostHttpsMuxer *vhost.HttpsMuxer
 
 	httpReverseProxy *vhost.HttpReverseProxy
 
-	// Manage all controllers.
+	// Manage all controllers
 	ctlManager *ControlManager
 
-	// Manage all proxies.
+	// Manage all proxies
 	pxyManager *ProxyManager
 
-	// Manage all visitor listeners.
+	// Manage all visitor listeners
 	visitorManager *VisitorManager
 
-	// Manage all tcp ports.
-	tcpPortManager *PortManager
+	// Manage all tcp ports
+	tcpPortManager *ports.PortManager
 
-	// Manage all udp ports.
-	udpPortManager *PortManager
+	// Manage all udp ports
+	udpPortManager *ports.PortManager
 
-	// Controller for nat hole connections.
+	// Tcp Group Controller
+	tcpGroupCtl *group.TcpGroupCtl
+
+	// Controller for nat hole connections
 	natHoleController *NatHoleController
 }
 
@@ -81,9 +86,10 @@ func NewService() (svr *Service, err error) {
 		ctlManager:     NewControlManager(),
 		pxyManager:     NewProxyManager(),
 		visitorManager: NewVisitorManager(),
-		tcpPortManager: NewPortManager("tcp", cfg.ProxyBindAddr, cfg.AllowPorts),
-		udpPortManager: NewPortManager("udp", cfg.ProxyBindAddr, cfg.AllowPorts),
+		tcpPortManager: ports.NewPortManager("tcp", cfg.ProxyBindAddr, cfg.AllowPorts),
+		udpPortManager: ports.NewPortManager("udp", cfg.ProxyBindAddr, cfg.AllowPorts),
 	}
+	svr.tcpGroupCtl = group.NewTcpGroupCtl(svr.tcpPortManager)
 
 	// Init assets.
 	err = assets.Load(cfg.AssetsDir)

tests/conf/auto_test_frpc.ini

@@ -23,6 +23,22 @@ remote_port = 10901
 use_encryption = true
 use_compression = true
 
+[tcp_group1]
+type = tcp
+local_ip = 127.0.0.1
+local_port = 10701
+remote_port = 10802
+group = test1
+group_key = 123
+
+[tcp_group2]
+type = tcp
+local_ip = 127.0.0.1
+local_port = 10702
+remote_port = 10802
+group = test1
+group_key = 123
+
 [udp_normal]
 type = udp
 local_ip = 127.0.0.1

tests/echo_server.go

@@ -28,6 +28,24 @@ func StartTcpEchoServer() {
 	}
 }
 
+func StartTcpEchoServer2() {
+	l, err := frpNet.ListenTcp("127.0.0.1", TEST_TCP2_PORT)
+	if err != nil {
+		fmt.Printf("echo server2 listen error: %v\n", err)
+		return
+	}
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			fmt.Printf("echo server2 accept error: %v\n", err)
+			return
+		}
+
+		go echoWorker2(c)
+	}
+}
+
 func StartUdpEchoServer() {
 	l, err := frpNet.ListenUDP("127.0.0.1", TEST_UDP_PORT)
 	if err != nil {
@@ -85,3 +103,25 @@ func echoWorker(c net.Conn) {
 		c.Write(buf[:n])
 	}
 }
+
+func echoWorker2(c net.Conn) {
+	buf := make([]byte, 2048)
+
+	for {
+		n, err := c.Read(buf)
+		if err != nil {
+			if err == io.EOF {
+				c.Close()
+				break
+			} else {
+				fmt.Printf("echo server read error: %v\n", err)
+				return
+			}
+		}
+
+		var w []byte
+		w = append(w, buf[:n]...)
+		w = append(w, buf[:n]...)
+		c.Write(w)
+	}
+}

tests/func_test.go

@@ -12,7 +12,7 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	"github.com/fatedier/frp/client"
-	"github.com/fatedier/frp/server"
+	"github.com/fatedier/frp/server/ports"
 
 	gnet "github.com/fatedier/golib/net"
 )
@@ -25,7 +25,9 @@ var (
 
 	TEST_STR                    = "frp is a fast reverse proxy to help you expose a local server behind a NAT or firewall to the internet."
 	TEST_TCP_PORT        int    = 10701
+	TEST_TCP2_PORT       int    = 10702
 	TEST_TCP_FRP_PORT    int    = 10801
+	TEST_TCP2_FRP_PORT   int    = 10802
 	TEST_TCP_EC_FRP_PORT int    = 10901
 	TEST_TCP_ECHO_STR    string = "tcp type:" + TEST_STR
 
@@ -62,6 +64,7 @@ var (
 
 func init() {
 	go StartTcpEchoServer()
+	go StartTcpEchoServer2()
 	go StartUdpEchoServer()
 	go StartUnixDomainServer()
 	go StartHttpServer()
@@ -226,19 +229,19 @@ func TestAllowPorts(t *testing.T) {
 	status, err := getProxyStatus(ProxyTcpPortNotAllowed)
 	if assert.NoError(err) {
 		assert.Equal(client.ProxyStatusStartErr, status.Status)
-		assert.True(strings.Contains(status.Err, server.ErrPortNotAllowed.Error()))
+		assert.True(strings.Contains(status.Err, ports.ErrPortNotAllowed.Error()))
 	}
 
 	status, err = getProxyStatus(ProxyUdpPortNotAllowed)
 	if assert.NoError(err) {
 		assert.Equal(client.ProxyStatusStartErr, status.Status)
-		assert.True(strings.Contains(status.Err, server.ErrPortNotAllowed.Error()))
+		assert.True(strings.Contains(status.Err, ports.ErrPortNotAllowed.Error()))
 	}
 
 	status, err = getProxyStatus(ProxyTcpPortUnavailable)
 	if assert.NoError(err) {
 		assert.Equal(client.ProxyStatusStartErr, status.Status)
-		assert.True(strings.Contains(status.Err, server.ErrPortUnAvailable.Error()))
+		assert.True(strings.Contains(status.Err, ports.ErrPortUnAvailable.Error()))
 	}
 
 	// Port normal
@@ -310,3 +313,25 @@ func TestRangePortsMapping(t *testing.T) {
 		}
 	}
 }
+
+func TestGroup(t *testing.T) {
+	assert := assert.New(t)
+
+	var (
+		p1 int
+		p2 int
+	)
+	addr := fmt.Sprintf("127.0.0.1:%d", TEST_TCP2_FRP_PORT)
+
+	for i := 0; i < 6; i++ {
+		res, err := sendTcpMsg(addr, TEST_TCP_ECHO_STR)
+		assert.NoError(err)
+		switch res {
+		case TEST_TCP_ECHO_STR:
+			p1++
+		case TEST_TCP_ECHO_STR + TEST_TCP_ECHO_STR:
+			p2++
+		}
+	}
+	assert.True(p1 > 0 && p2 > 0, "group proxies load balancing")
+}

utils/vhost/router.go

@@ -52,16 +52,13 @@ func (r *VhostRouters) Del(domain, location string) {
 	if !found {
 		return
 	}
-
-	for i, vr := range vrs {
-		if vr.location == location {
-			if len(vrs) > i+1 {
-				r.RouterByDomain[domain] = append(vrs[:i], vrs[i+1:]...)
-			} else {
-				r.RouterByDomain[domain] = vrs[:i]
-			}
+	newVrs := make([]*VhostRouter, 0)
+	for _, vr := range vrs {
+		if vr.location != location {
+			newVrs = append(newVrs, vr)
 		}
 	}
+	r.RouterByDomain[domain] = newVrs
 }
 
 func (r *VhostRouters) Get(host, path string) (vr *VhostRouter, exist bool) {