MCP Kubernetes Server

Instructions

Args:
    name: Name of the deployment to update
    namespace: Namespace of the deployment
    replicas: New number of replicas (optional)
    image: New container image (optional)

Implementation Reference

• kubernetes.py:316-351 (handler)

  Handler function for the 'update_deployment' tool, decorated with @mcp.tool() for automatic registration. Updates Kubernetes deployment replicas and/or image using kubectl commands.

  @mcp.tool()
  async def update_deployment(name: str, namespace: str = "default", replicas: int = None, image: str = None) -> dict:
      """Update a Kubernetes deployment with new replicas count and/or image
      
      Args:
          name: Name of the deployment to update
          namespace: Namespace of the deployment
          replicas: New number of replicas (optional)
          image: New container image (optional)
      """
      try:
          if replicas is None and image is None:
              return {"error": "Must specify either replicas or image to update"}
              
          updates = []
          if replicas is not None:
              cmd = ["kubectl", "scale", "deployment", name,
                    "--replicas", str(replicas),
                    "-n", namespace]
              result = subprocess.run(cmd, capture_output=True, text=True, check=True )
              updates.append(f"Scaled replicas to {replicas}")
              
          if image is not None:
              cmd = ["kubectl", "set", "image", f"deployment/{name}",
                    f"{name}={image}",
                    "-n", namespace]
              result = subprocess.run(cmd, capture_output=True, text=True, check=True )
              updates.append(f"Updated image to {image}")
              
          return {
              "message": f"Deployment {name} updated successfully in namespace {namespace}",
              "updates": updates,
              "details": result.stdout
          }
      except subprocess.CalledProcessError as e:
          return {"error": f"Failed to update deployment: {str(e)}"}

• kubernetes.py:316-316 (registration)

  Registration of the 'update_deployment' tool via FastMCP decorator.

  @mcp.tool()