Failed to connect to GCS at address

[wowlza]

在运行脚本examples/scripts/train_mm_eureka_qwen_7b_single_node.sh时，出现多机分布和 Ray 连接失败，报错如下：

+ sleep 30
+ ray start --address=:6379 --num-gpus 8 --block
Local node IP: 127.0.0.1
[2025-07-23 10:05:49,679 W 51000 51000] gcs_rpc_client.h:151: Failed to connect to GCS at address :6379 within 5 seconds.
[2025-07-23 10:06:19,681 W 51000 51000] gcs_client.cc:183: Failed to get cluster ID from GCS server: TimedOut: Timed out while waiting for GCS to become available.

[LeoDu0314]

看上去$MASTER_ADDR这个环境变量缺失了