How can I inject QdrantVectorStore with Semantic Kernel’s DI

[CristianoPi]

Hi everyone 👋,

I’m working with Semantic Kernel (.NET) and trying to hook up Qdrant as my vector store via dependency injection, instead of instantiating the client manually.

What I’m doing

var kernelBuilder = Kernel.CreateBuilder();

kernelBuilder
    .AddOpenAIChatCompletion(
        modelId: _cfg.ModelId,
        apiKey : _cfg.ApiKey)
    .Services                     // use the SK DI container
        .AddLogging(l => l.AddConsole().SetMinimumLevel(LogLevel.Trace))
        .AddQdrantVectorStore(     // SK extension method
            host: _cfg.QdrantHost, // e.g. "qdrant"
            port: _cfg.QdrantPort  // 6334 (gRPC) or 6333 (HTTP)
        );

_kernel = kernelBuilder.Build();
var store = _kernel.GetRequiredService<QdrantVectorStore>();

What fails
The first time I actually enumerate a search:

await foreach (var rec in collection.SearchAsync(vector, top:5)) { ... }
I get
VectorStoreException: Call to vector store failed.

Environment

Item	Value
.NET SDK	9.0
Semantic Kernel	1.52.1
Qdrant Docker image	qdrant/qdrant:1.9.2 (ports 6333/6334 exposed)
Connectors OpenAI	1.52
Connectors Qdrant	1.52-preview

[westey-m]

Hi @CristianoPi, can you check the inner exception of the VectorStoreException that you are getting. It should provide more detail about the type of failure. Post the detail here and we can help troubleshoot further.

Also, when running Qdrant running locally in a docker container, you typically need to only specify host as "localhost" for it to work, e.g.

builder.Services.AddQdrantVectorStore("localhost");

QdrantVectorStore only supports gRPC, so the port param has to be 6334 (if that's what you have exposed on the docker container for gRPC), but 6334 also happens to be the default value for the port parameter.

Some more info here: https://learn.microsoft.com/en-us/semantic-kernel/concepts/vector-store-connectors/out-of-the-box-connectors/qdrant-connector
And an end to end sample using Qdrant here: https://learn.microsoft.com/en-us/semantic-kernel/concepts/vector-store-connectors/?pivots=programming-language-csharp#getting-started-with-vector-store-connectors

[westey-m]

Closing the discussion due to lack of additional info to troubleshoot further. Feel free to reopen with more info.