CODEWITHSUNDEEP
c#docker
3xGuy
3xGuy

Reputation: 2559

Ocelot Cannot connect to downstream in docker

I have a gateway that maps multiple services. This works great when I run it without docker. However, when I change to the docker version, it just doesn't work.

I get the following message:

: POST' 2024-10-21 06:21:49 [10:21:49 WRN] requestId: 0HN7H3M32VGVE:00000001, previousRequestId: No PreviousRequestId, message: 'Error Code: ConnectionToDownstreamServiceError Message: Error connecting to downstream service, exception: System.Net.Http.HttpRequestException: Connection refused (crm:8001) 2024-10-21 06:21:49 ---> System.Net.Sockets.SocketException (111): Connection refused 2024-10-21 06:21:49 at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token) 2024-10-21 06:21:49 at System.Net.Sockets.Socket.g__WaitForConnectWithCancellation|285_0(AwaitableSocketAsyncEventArgs saea, ValueTask connectTask, CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken) 2024-10-21 06:21:49 --- End of inner exception stack trace --- 2024-10-21 06:21:49 at System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(String host, Int32 port, HttpRequestMessage initialRequest, Boolean async, CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Http.HttpConnectionPool.AddHttp11ConnectionAsync(QueueItem queueItem) 2024-10-21 06:21:49 at System.Threading.Tasks.TaskCompletionSourceWithCancellation`1.WaitWithCancellationAsync(CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken) 2024-10-21 06:21:49 at System.Net.Http.DiagnosticsHandler.SendAsyncCore(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken) 2024-10-21 06:21:49 at Ocelot.Requester.TimeoutDelegatingHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) 2024-10-21 06:21:49
at Ocelot.Requester.MessageInvokerHttpRequester.GetResponse(HttpContext httpContext) errors found in ResponderMiddleware. Setting error response for request path:/crm/customers/get-page, request method: POST'

I have changed the ocelot.json from this:

{
    "Routes": [
      // CRM routes
      {
        "DownstreamPathTemplate": "/{everything}",
        "DownstreamScheme": "http",
        "DownstreamHostAndPorts": [
          {
            "Host": "localhost",
            "Port": 8001
          }
        ],
        "UpstreamPathTemplate": "/crm/{everything}",
        "UpstreamHttpMethod": [ "GET", "POST" ]
      }
//other mappings
    ],
    "GlobalConfiguration": {
      "BaseUrl": "http://localhost:5000;https://localhost:5001"
    }
  }

to:

{
    "Routes": [
      // CRM routes
      {
        "DownstreamPathTemplate": "/{everything}",
        "DownstreamScheme": "http",
        "DownstreamHostAndPorts": [
          {
            "Host": "crm",
            "Port": 8001
          }
        ],
        "UpstreamPathTemplate": "/crm/{everything}",
        "UpstreamHttpMethod": [ "GET", "POST" ]
      }
     // other mappings.
      "GlobalConfiguration": {
        "BaseUrl": "http://localhost:5000;https://localhost:5001"
      }
  }

Why would this not be able to connect to the docker services. They all work correctly from postman.

Upvotes: 0

Views: 50

Answers (1)

3xGuy
3xGuy

Reputation: 2559

I found the issue, I hope this helps others. I was trying to connect to the external port of the docker container. In other words the port that we map to when I should have been mapped to the port that we expose in the dockerfile.

{
  "DownstreamPathTemplate": "/{everything}",
  "DownstreamScheme": "http",
  "DownstreamHostAndPorts": [
    {
      "Host": "crm",
      "Port": 8080
    }
  ],
  "UpstreamPathTemplate": "/crm/{everything}",
  "UpstreamHttpMethod": [ "GET", "POST" ]
},

Upvotes: 0

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