How severe does this issue affect your experience of using Ray? Medium: It contributes to significant difficulty to complete my task, but I can work around it. I’m working through the ray[serve] tutorials but I’m unable to start and run them detached because ray start --head fails. If I used met…

I have the same problem, I can not ray start --head . It is also unable to connect to GCS.

@zyc-bit , can you specify the Ray and Python version being used, and post the content of gcs_server.out? @david.waterworth sorry for missing the issue earlier! From the log message the issue is most likely related to registering port at 6379, but as you confirmed there is no process currently using…

@Mingwei , thank you vary much for your reply. When I run ray start --head, I got an error: $ ray start --head Usage stats collection will be enabled by default in the next release. See https://github.com/ray-project/ray/issues/20857 for more details. Local node IP: 10.140.0.32 2022-05-08 22:32:27…

Hi @zyc-bit , gcs-server.out is most likely at /tmp/ray/session_latest/logs/gcs_server.out on Linux and MacOS. Btw, can you also try lsof -i :6379 to see if there is a port conflict?

I run lsof -i :6379 . And it gave me nothing. And my ray is 1.12.0, and my python is 3.7.

Hi @Mingwei , my gcs_server.out shows blow, [2022-05-08 22:32:21,865 I 129461 129461] (gcs_server) io_service_pool.cc:35: IOServicePool is running with 1 io_service. [2022-05-08 22:32:21,866 I 129461 129461] (gcs_server) gcs_server.cc:55: GCS storage type is memory [2022-05-08 22:32:21,866 I 12946…

Hi @Mingwei , I successed. Command lsof -i :6379 always returned nothing. So I thought there was no port conflict. But the fact is that my colleague told me he just stop his ray process. (I still do not understand why lsof -i :6379 returned nothing before.) So mine worked. Thank you a lot.

Great that you found the issue. It seems only using sudo lsof -i :6379 can show processes from other users. We can update log messages and documentations in Ray.

Hi! I am now facing the same problem. And port 6739 can not be used. [WechatIMG251] And could you give me some advice about this problem. Thank you very much!

Ray start --head Unable to connect to GCS

Ray Core

david.waterworth May 8, 2022, 10:29pm 4

@Mingwei thanks - my question was answered here - there actually was something using the port.

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Ray start --head Unable to connect to GCS

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