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+说明:
+====
+####
+    根据actives.yaml配置, 添加adsl拨号的主机. eg:
+```yaml
+switch:
+  192.168.6.100:8080: 
+    group: ["10.10.10.70", "10.10.10.71"] # 苏州
+    city: "3205"
+  192.168.6.100:8082:
+    group: ["10.10.10.74", "10.10.10.75"] # 天津
+    city: "12"
+  192.168.6.100:8083: 
+    group: ["10.10.10.76", "10.10.10.77"] # 滨州
+    city: "3716"
+restart: 50
+```
+    192.168.6.100:8080 为代理的ip地址
+    group: 内为adsl主机的vpn节点ip
+    city: 为城市代码
+    restart: 为切换时间
+####
+----
+#####
+http:/{ipcenter_host}/ippool/switch/actives 可以获取当前可用ip地址的json信息. eg:
+```json
+{"192.168.6.100:8080":{"city":"3205","group":["10.10.10.70","10.10.10.71"]},"192.168.6.100:8082":{"city":"12","group":["10.10.10.74","10.10.10.75"]},"192.168.6.100:8083":{"city":"3716","group":["10.10.10.76","10.10.10.77"]},"192.168.6.100:8085":{"city":"5328","group":["10.10.10.80","10.10.10.81"]},"192.168.6.100:8087":{"city":"1506","group":["10.10.10.84","10.10.10.85"]},"192.168.6.100:8088":{"city":"4601","group":["10.10.10.86","10.10.10.87"]},"192.168.6.100:8091":{"city":"4602","group":["10.10.10.93","10.10.10.92"]}}
+```
+#####
+
+----
+启动例子:
+====
+
+```
+git clone http:... 
+go build
+sh start.sh
+```
+