[I] brpc server重启后8686端口不通 (brpc)

[via GitHub]

yangyang233333 opened a new issue, #2826:
URL: https://github.com/apache/brpc/issues/2826

   **Describe the bug (描述bug)**
   我们使用systemd来守护进程，并且设置了开机自启动进程。但是在线上会随机的出现：
   brpc_server_.Start("ip:8686", &options) 
执行成功时(返回值为0)，但是对应的8686端口却无法被访问。（700台机器，偶然出现）。详细代码如下：
   ```c++
     brpc::ServerOptions options;
     options.num_threads = common::FLAGS_brpc_num_threads;
     bthread::FLAGS_bthread_concurrency = 
common::FLAGS_brpc_bthread_concurrency;
     butil::EndPoint endpoint;
     butil::str2endpoint(endpoint_.c_str(), &endpoint);
     // Add controller service
     controller_service_.Init(file_store_);
     auto controller_services = service::ControllerMapToString();
     if (brpc_server_.AddService(&controller_service_, 
brpc::SERVER_DOESNT_OWN_SERVICE,
                                 controller_services) != 0) {
       return {common::START_FAIL, "Http service add failed"};
     }
     if (brpc_server_.Start(endpoint, &options) != 0) {
       LOG(ERROR) << "Brpc server start failed";
       return common::Status(common::START_FAIL, "Brpc server start failed");
     }
   ```
   
   **To Reproduce (复现方法)**
   假设brpc 
server进程为A，使用systemd守护进程A，然后机器重启后，systemd自动拉起A，此时A中的brpc_server_.Start(endpoint,
 &options)返回0表示执行成功，但是对应的8686端口未成功监听。
   
   
   **Versions (各种版本)**
   OS: debain 10 
   Compiler: gcc 9.3
   brpc: 1.7.0
   protobuf: libprotoc 3.6.1
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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