MCP Kubernetes Server

A Model Context Protocol (MCP) server for Kubernetes, supporting chunked HTTP streaming, advanced troubleshooting prompts, and full Kubernetes resource/tool coverage.

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Prerequisites

• Node.js v18+ (for local dev/build)
• Docker (for containerization)
• Access to a Kubernetes cluster (AKS, EKS, GKE, or local)
• kubectl configured (for testing and kubeconfig management)

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1. Build and Run Locally

npm install
npm run build
MCP_TRANSPORT=http-chunked npm start

• By default, the server uses your local kubeconfig (~/.kube/config or C:\Users\\.kube\config).
• To use a custom kubeconfig, set the KUBECONFIG environment variable:

export KUBECONFIG=/path/to/your/kubeconfig
  npm start

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2. Dockerize the MCP Server

Build the Docker image

docker build -t yourrepo/mcp-server:latest .

Push to your registry

docker push yourrepo/mcp-server:latest

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3. Deploy on Kubernetes (AKS, EKS, GKE)

Edit the image name in k8s-mcp-server.yaml:

Replace yourrepo/mcp-server:latest with your image name.

Apply the manifest

kubectl apply -f k8s-mcp-server.yaml

• This creates a namespace, ServiceAccount, RBAC, Deployment, and Service.
• By default, the Service is ClusterIP (internal). Change to LoadBalancer or NodePort for external access.

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4. Using the MCP Server

HTTP Chunked Endpoint

• The server exposes /call-tool-chunked on port 3000.
• Example (using curl):

curl -X POST http://:3000/call-tool-chunked \
    -H "Content-Type: application/json" \
    -d '{"name": "get_pods", "args": {"namespace": "default"}}'

• The response will stream progress and results as JSON lines.

Using Prompts

• To use a prompt, POST to /call-tool-chunked with the prompt name, e.g.:

curl -X POST http://:3000/call-tool-chunked \
    -H "Content-Type: application/json" \
    -d '{"name": "k8s-pod-crashloop-diagnose", "args": {"podName": "my-pod", "namespace": "default"}}'

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5. Kubeconfig and Permissions

• The MCP server uses the kubeconfig available in the container (default: /root/.kube/config).
• For in-cluster deployments, it uses the ServiceAccount and RBAC provided in the manifest.
• To use a custom kubeconfig, mount it as a secret and update the Deployment (see commented lines in the manifest).

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6. Security Notes

• Do not expose the MCP server to the public internet without authentication and TLS.
• Use network policies, firewalls, or VPNs to restrict access.
• Use least-privilege RBAC for the ServiceAccount.

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7. Extending and Customizing

• Add new tools, resources, or prompts in the src/ directory.
• Rebuild and redeploy the Docker image after making changes.

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8. Troubleshooting

• Check logs with kubectl logs -n mcp-server deploy/mcp-server.
• Ensure the ServiceAccount has the required permissions for your use case.
• For local testing, ensure your kubeconfig is valid and has cluster access.

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License

MIT