.net - ACI 未接收 UDP 通信

Question

我希望在 Azure 容器实例中托管一个容器，监听 UDP 端口上的传入日志。我开发了 docker 镜像，可以在本地和我公司的内部网络中运行。想要在 Azure 中测试它，但我没有收到任何数据包...但是当我使用来自 github 的示例 UDP 监听器检查 UDP 连接时，它工作正常(我使用了那个: mendhak/docker-udp-listener )。

令我担心的是，我的目标容器实例收到了 0 个字节。看来端口已被关闭。

使用脚本部署 ACI:
az container create --resource-group <resource_group> --name sidecar --image <my_repository>/sidecar:latest --ip-address Public --ports 7777 --protocol UDP -e "UdpPort=7777"

此时我有点不知道发生了什么。

这是来自 Azure 的 NetworkBytesReceivedPerSecond 指标。在那段时间里，我发送了几个请求。

2022-07-15 08:14:00  Network Bytes Received Per Second  0.0
2022-07-15 08:15:00  Network Bytes Received Per Second  0.0
2022-07-15 08:16:00  Network Bytes Received Per Second  0.0
2022-07-15 08:17:00  Network Bytes Received Per Second  0.0
2022-07-15 08:18:00  Network Bytes Received Per Second  0.0
2022-07-15 08:19:00  Network Bytes Received Per Second  0.0
2022-07-15 08:20:00  Network Bytes Received Per Second  0.0
2022-07-15 08:21:00  Network Bytes Received Per Second  0.0
2022-07-15 08:22:00  Network Bytes Received Per Second  0.0
2022-07-15 08:23:00  Network Bytes Received Per Second  0.0
2022-07-15 08:24:00  Network Bytes Received Per Second  0.0
2022-07-15 08:25:00  Network Bytes Received Per Second  0.0
2022-07-15 08:26:00  Network Bytes Received Per Second  0.0
2022-07-15 08:27:00  Network Bytes Received Per Second  0.0
2022-07-15 08:28:00  Network Bytes Received Per Second  0.0
2022-07-15 08:29:00  Network Bytes Received Per Second  0.0
2022-07-15 08:30:00  Network Bytes Received Per Second  0.0
2022-07-15 08:31:00  Network Bytes Received Per Second  0.0
2022-07-15 08:32:00  Network Bytes Received Per Second  0.0
2022-07-15 08:33:00  Network Bytes Received Per Second  0.0
2022-07-15 08:34:00  Network Bytes Received Per Second  0.0
2022-07-15 08:35:00  Network Bytes Received Per Second  0.0
2022-07-15 08:36:00  Network Bytes Received Per Second  0.0
2022-07-15 08:37:00  Network Bytes Received Per Second  0.0
2022-07-15 08:38:00  Network Bytes Received Per Second
2022-07-15 08:39:00  Network Bytes Received Per Second  0.0
2022-07-15 08:40:00  Network Bytes Received Per Second  0.0
2022-07-15 08:41:00  Network Bytes Received Per Second
2022-07-15 08:42:00  Network Bytes Received Per Second  0.0
2022-07-15 08:43:00  Network Bytes Received Per Second  0.0
2022-07-15 08:44:00  Network Bytes Received Per Second  0.0
2022-07-15 08:45:00  Network Bytes Received Per Second  0.0

而且看起来 7777 端口确实在 UDP 中开放 (从容器内部输出nestat -a):

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State      
udp6       0      0 0.0.0.0:7777            [::]:*                             
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   Path
unix  2      [ ACC ]     STREAM     LISTENING     5013     /tmp/dotnet-diagnostic-19-1606-socket

我的套接字实现:

        public async Task Listen(CancellationToken cancelToken)
        {
            IPEndPoint localEndpoint = new IPEndPoint(IPAddress.Any, _port);

            UdpSocket = new Socket(SocketType.Dgram, ProtocolType.Udp);
            UdpSocket.Bind(localEndpoint);
            await ReceiveAsync(cancelToken);
        }

        private async Task ReceiveAsync(CancellationToken cancelToken)
        {
            byte[] buffer = GC.AllocateArray<byte>(65527, pinned: true);
            Memory<byte> bufferMemory = buffer.AsMemory();

            while (!cancelToken.IsCancellationRequested)
            {
                try
                {
                    SocketReceiveFromResult result = await UdpSocket.ReceiveFromAsync(bufferMemory, SocketFlags.None, _blankEndpoint);
                    if (result.ReceivedBytes > 0)
                    {
                        byte[] relevantBuffer = bufferMemory.Slice(0, result.ReceivedBytes).ToArray();
                        string message = Encoding.UTF8.GetString(relevantBuffer);
                        _onMessageReceived(result, message);
                    }
                }
                catch (SocketException)
                {
                    break;
                }
            }
        }

Answer 1

几天后，我再次检查通信，容器收到消息。一切似乎都运转良好。看起来是 Azure 不可用...... 我的配置是正确的。问题解决了。