Kubernetes MCP Server

Instructions

Implementation Reference

• server.js:2118-2127 (handler)

  Executes the drain-node tool by running the 'kubectl drain' command with optional force and ignore-daemonsets flags, returning the command output.

  case "drain-node": {
    const { node, force = false, ignore_daemonsets = true } = args;
    const forceArg = force ? "--force" : "";
    const ignoreArg = ignore_daemonsets ? "--ignore-daemonsets" : "";
    const cmd = `kubectl drain ${node} ${forceArg} ${ignoreArg} --delete-emptydir-data`;
    const { stdout } = await execAsync(cmd);
    return {
      content: [{ type: "text", text: stdout || `Node ${node} drained successfully` }]
    };
  }

• server.js:1155-1175 (schema)

  Tool definition including name, description, and input schema for the drain-node tool, used for registration and validation.

    name: "drain-node",
    description: "Drain a node for maintenance",
    inputSchema: {
      type: "object",
      properties: {
        node: { 
          type: "string",
          description: "The name of the node to drain"
        },
        force: { 
          type: "boolean",
          description: "Force drain even if there are unmanaged pods"
        },
        ignore_daemonsets: { 
          type: "boolean",
          description: "Ignore DaemonSet pods during drain"
        }
      },
      required: ["node"]
    }
  },

• server.js:1392-1394 (registration)

  Registers the list of all tools, including drain-node, for the ListToolsRequest.

  server.setRequestHandler(ListToolsRequestSchema, async () => {
    return { tools };
  });