This topic describes the default ports used by frontend (FE) and backend (BE) nodes in a StarRocks cluster on E-MapReduce (EMR), and explains how to access the FE UI and the BE metrics endpoint.
FE ports
| Port name | Default port | Version | Communication direction | Description |
|---|---|---|---|---|
http_port |
8030 | EMR V5.8.0 and earlier / EMR V3.42.0 and earlier | FE <--> User | HTTP server port on the FE |
http_port |
18030 | EMR V5.9.0 and later / EMR V3.43.0 and later | FE <--> User | HTTP server port on the FE |
rpc_port |
9020 | All versions | BE --> FE; FE <--> FE | Thrift server port on the FE |
query_port |
9030 | All versions | FE <--> User | MySQL server port on the FE |
Access the FE UI
Enter FE_IP:http_port in your browser's address bar to open the FE UI.
FE_IP is typically a public IP address.BE ports
| Port name | Default port | Version | Communication direction | Description |
|---|---|---|---|---|
be_port |
9060 | All versions | FE --> BE | Thrift server port on the BE. Receives requests from an FE. |
webserver_port |
8040 | EMR V5.8.0 and earlier / EMR V3.42.0 and earlier | BE <--> BE | HTTP server port on the BE |
webserver_port |
18040 | EMR V5.9.0 and later / EMR V3.43.0 and later | BE <--> BE | HTTP server port on the BE |
heartbeat_service_port |
9050 | All versions | FE --> BE | Heartbeat service port for the Thrift server on the BE. Receives heartbeat messages from an FE. |
brpc_port |
8060 | All versions | FE <--> BE; BE <--> BE | better Remote Procedure Call (bRPC) port on the BE. Used for communication between BEs. |
Access BE metrics
Run the following command to get metrics from a BE node:
curl http://be_ip:webserver_port/metricsbe_ip is typically an internal IP address.FAQ
Why do I fail to access a StarRocks cluster by using port 8030 or port 8040?