OpenDayLight SDN无法通过RESTCONF获取仪表表信息求助

问题背景 #

使用OpenDayLight 0.8.4、Openvswitch 13和Mininet 2.3.0环境，调用REST API /restconf/operational/opendaylight-inventory:nodes/node/openflow:1/meter/0 获取仪表信息时，出现错误：

Data-missing : Request could not be completed because the relevant data model content does not exist. - : Request could not be completed because the relevant data model content does not exist

已安装的ODL模块包括：

opendaylight-user@root>feature:install odl-restconf
opendaylight-user@root>feature:install odl-l2switch-all
opendaylight-user@root>feature:install odl-l2switch-switch
opendaylight-user@root>feature:install odl-l2switch-switch-ui                   
opendaylight-user@root>feature:install odl-openflowplugin-flow-services-rest 
opendaylight-user@root>feature:install odl-mdsal-all 
opendaylight-user@root>feature:install odl-dluxapps-applications

流表相关API（如http://localhost:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/table/0）可正常访问，说明OpenFlow基础功能正常，问题出在Meter相关模块缺失。

解决步骤 #

1. 安装Meter相关核心模块 #

进入ODL的Karaf控制台，执行以下命令安装缺失的Meter服务及REST接口模块：

opendaylight-user@root>feature:install odl-meterservice
opendaylight-user@root>feature:install odl-openflowplugin-meter-services-rest

• odl-meterservice：ODL处理Meter配置与状态的核心服务模块
• odl-openflowplugin-meter-services-rest：提供Meter相关的RESTCONF接口支持，对应你调用的API路径

2. 验证模块安装状态 #

执行以下命令确认模块已成功启动：

opendaylight-user@root>feature:list | grep meter

输出中应能看到odl-meterservice和odl-openflowplugin-meter-services-rest处于Started状态。

3. 验证API可用性 #

重新调用目标API：

/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/meter/0

注意：如果meter/0尚未创建，仍会提示数据不存在。此时需要先通过RESTCONF创建Meter实例，示例POST请求（JSON格式）：
请求路径：/restconf/config/opendaylight-inventory:nodes/node/openflow:1/meter/0
请求体：

{
  "meter": [
    {
      "meter-id": 0,
      "flags": ["meter-kbps"],
      "bands": [
        {
          "band-id": 0,
          "type": "drop",
          "rate": 1000
        }
      ]
    }
  ]
}

内容的提问来源于stack exchange，提问作者user25424132