GCP：无法连接到云TPU

Question

I started an instance with TPU by following this quick start tutorial using ctpu up command and I was able to run MNIST tutorial successfully. I logged out of cloud shell and logged into my vm connected to TPU using SSH console as explained here , when I run MNIST tutorial again I'm getting

RuntimeError: Cannot find any TPU cores in the system. Please double check Tensorflow master address and TPU worker(s).

When I run ctpu ls , I get

#       Flock Name      Status
0:      my-tpu(*)  running

ctpu status command gives

Your cluster is running!
Compute Engine VM:  RUNNING
Cloud TPU:          RUNNING

Am I missing something basic here?

Answer 1

ctpu passes this name to the Compute Engine VM as an environment variable ( TPU_NAME ), but gcloud doesn't.

Specify your TPU explicitly: use --tpu=my-tpu instead of --tpu=$TPU_NAME