Merge pull request #188 from linrunqi08/feature/taiye/fix_machine_gro…

…up_sample

fix machine group sample

README.md

@@ -192,12 +192,13 @@ totalLogCount := 0
 
    参考 [machine_group_sample.go](https://github.com/aliyun/aliyun-log-go-sdk/blob/master/example/machine_group/machine_group_sample.go) 
 
+机器组分为IP型机器组和标识型机器组，二选一
+
+创建标识型机器组
 ```go
 attribute := sls.MachinGroupAttribute{
-   ExternalName: "",
-   TopicName:    "",
 }
-machineList := []string{"mac-user-defined-id-value"}
+machineList := []string{"mac-user-defined-id-value_XX"}
 var machineGroup = &sls.MachineGroup{
    Name:          groupName,
    MachineIDType: "userdefined",
@@ -210,6 +211,24 @@ if err != nil {
 }
 ```
 
+创建IP型机器组
+```go
+attribute := sls.MachinGroupAttribute{
+}
+machineList := []string{"192.168.XX.XX"}
+var machineGroup = &sls.MachineGroup{
+   Name:          groupName,
+   MachineIDType: "ip",
+   MachineIDList: machineList,
+   Attribute:     attribute,
+}
+err = util.Client.CreateMachineGroup(ProjectName, machineGroup)
+if err != nil {
+   fmt.Println(err)
+}
+```
+
+
 8. **创建logtail 采集配置**
 
    logtail 采集配置，目前通过sdk 支持创建下列几种模式的采集配置，分别为 [完整正则](https://github.com/aliyun/aliyun-log-go-sdk/blob/master/example/config/log_config_common_regex.go)，[分隔符模式](https://github.com/aliyun/aliyun-log-go-sdk/blob/master/example/config/log_config_delimiter.go)，[json模式](https://github.com/aliyun/aliyun-log-go-sdk/blob/master/example/config/log_config_json.go) ，[插件模式](https://github.com/aliyun/aliyun-log-go-sdk/blob/master/example/config/log_config_plugin.go)，这里展示的完整正则模式的创建。
@@ -259,4 +278,4 @@ if err != nil {
 
 ```
 protoc -I=. -I=$GOPATH/src -I=$GOPATH/src/github.com/gogo/protobuf/protobuf --gofast_out=. log.proto
-```
+```

example/machine_group/machine_group_sample.go

@@ -182,10 +182,7 @@ func deleteMachineGroup(groupName string) (err error) {
 }
 
 func createMachineGroup(groupName string) (err error) {
-	attribute := sls.MachinGroupAttribute{
-		ExternalName: "",
-		TopicName:    "",
-	}
+	attribute := sls.MachinGroupAttribute{}
 	machineList := []string{"mac-user-defined-id-value"}
 	var machineGroup = &sls.MachineGroup{
 		Name:          groupName,