Kubernetes MCP Server

A Kubernetes Model Context Protocol (MCP) server that provides tools for interacting with Kubernetes clusters through a standardized interface.

Features

• API Resource Discovery: Get all available API resources in your Kubernetes cluster
• Resource Listing: List resources of any type with optional namespace and label filtering
• Resource Details: Get detailed information about specific Kubernetes resources
• Resource Description: Get comprehensive descriptions of Kubernetes resources
• Pod Logs: Retrieve logs from specific pods
• Node Metrics: Get resource usage metrics for specific nodes
• Pod Metrics: Get CPU and Memory metrics for specific pods
• Event Listing: List events within a namespace or for a specific resource.
• Resource Creation: Create new Kubernetes resources from a manifest.
• Standardized Interface: Uses the MCP protocol for consistent tool interaction
• Flexible Configuration: Supports different Kubernetes contexts and resource scopes

Prerequisites

• Go 1.20 or later
• Access to a Kubernetes cluster
• kubectl configured with appropriate cluster access

Installation

1. Clone the repository:

git clone https://github.com/reza-gholizade/k8s-mcp-server.git
cd k8s-mcp-server

2. Install dependencies:

go mod download

3. Build the server:

go build -o k8s-mcp-server main.go

Usage

Starting the Server

Run the server:

./k8s-mcp-server

The server will start and listen on stdin/stdout for MCP protocol messages.

Available Tools

1. getAPIResources

Retrieves all available API resources in the Kubernetes cluster.

Parameters:

• includeNamespaceScoped (boolean): Whether to include namespace-scoped resources (defaults to true)
• includeClusterScoped (boolean): Whether to include cluster-scoped resources (defaults to true)

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getAPIResources",
  "params": {
    "arguments": {
      "includeNamespaceScoped": true,
      "includeClusterScoped": true
    }
  }
}

2. listResources

Lists all instances of a specific resource type.

Parameters:

• Kind (string, required): The kind of resource to list (e.g., "Pod", "Deployment")
• namespace (string): The namespace to list resources from (if omitted, lists across all namespaces for namespaced resources)
• labelSelector (string): Filter resources by label selector

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "listResources",
  "params": {
    "arguments": {
      "Kind": "Pod",
      "namespace": "default",
      "labelSelector": "app=nginx"
    }
  }
}

3. getResource

Retrieves detailed information about a specific resource.

Parameters:

• kind (string, required): The kind of resource to get (e.g., "Pod", "Deployment")
• name (string, required): The name of the resource to get
• namespace (string): The namespace of the resource (if it's a namespaced resource)

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getResource",
  "params": {
    "arguments": {
      "kind": "Pod",
      "name": "nginx-pod",
      "namespace": "default"
    }
  }
}

4. describeResource

Describes a resource in the Kubernetes cluster based on given kind and name, similar to kubectl describe.

Parameters:

• Kind (string, required): The kind of resource to describe (e.g., "Pod", "Deployment")
• name (string, required): The name of the resource to describe
• namespace (string): The namespace of the resource (if it's a namespaced resource)

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "describeResource",
  "params": {
    "arguments": {
      "Kind": "Pod",
      "name": "nginx-pod",
      "namespace": "default"
    }
  }
}

5. getPodsLogs

Retrieves the logs of a specific pod in the Kubernetes cluster.

Parameters:

• Name (string, required): The name of the pod to get logs from.
• namespace (string): The namespace of the pod (if it's a namespaced resource).

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getPodsLogs",
  "params": {
    "arguments": {
      "Name": "my-app-pod-12345",
      "namespace": "production"
    }
  }
}

6. getNodeMetrics

Retrieves resource usage metrics for a specific node in the Kubernetes cluster.

Parameters:

• Name (string, required): The name of the node to get metrics from.

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getNodeMetrics",
  "params": {
    "arguments": {
      "Name": "worker-node-1"
    }
  }
}

7. getPodMetrics

Retrieves CPU and Memory metrics for a specific pod in the Kubernetes cluster.

Parameters:

• namespace (string, required): The namespace of the pod.
• podName (string, required): The name of the pod.

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getPodMetrics",
  "params": {
    "arguments": {
      "namespace": "default",
      "podName": "my-app-pod-67890"
    }
  }
}

8. getEvents

Retrieves events for a specific namespace or resource in the Kubernetes cluster.

Parameters:

• namespace (string): The namespace to get events from. If omitted, events from all namespaces are considered (if permitted by RBAC).
• resourceName (string): The name of a specific resource (e.g., a Pod name) to filter events for.
• resourceKind (string): The kind of the specific resource (e.g., "Pod") if resourceName is provided.

Example (Namespace Events):

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getEvents",
  "params": {
    "arguments": {
      "namespace": "default"
    }
  }
}

Example (Resource Events):

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getEvents",
  "params": {
    "arguments": {
      "namespace": "production",
      "resourceName": "my-app-pod-12345",
      "resourceKind": "Pod"
    }
  }
}

9. createorUpdateResource

Creates a new resource in the Kubernetes cluster from a YAML or JSON manifest.

Parameters:

• manifest (string, required): The YAML or JSON manifest of the resource to create.
• namespace (string, optional): The namespace in which to create the resource. If the manifest contains a namespace, this parameter can be omitted or used to override it (behavior might depend on server implementation).

Example:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "createResource",
  "params": {
    "arguments": {
      "namespace": "default",
      "manifest": "apiVersion: v1\nkind: Pod\nmetadata:\n  name: my-new-pod\nspec:\n  containers:\n  - name: nginx\n    image: nginx:latest"
    }
  }
}

Development

Project Structure

.
├── handlers/         # Tool handlers
│   └── handlers.go   # Implementation of MCP tools
├── pkg/             # Internal packages
│   └── k8s/         # Kubernetes client implementation
├── main.go          # Server entry point
├── go.mod           # Go module definition
└── go.sum           # Go module checksums

Adding New Tools

To add a new tool:

1. Create a new tool definition function (e.g., MyNewTool() mcp.Tool) in handlers/handlers.go
2. Implement the tool handler function (e.g., MyNewHandler(client *k8s.Client) func(...)) in handlers/handlers.go
3. Register the tool and its handler in main.go using s.AddTool()

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for details on how to contribute to this project.

License

gholizade.net@gmail.com

This project is licensed under the MIT License - see the LICENSE file for details.

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