问题
I'm connecting to my Spark cluster master node with dynamic port forwarding so that I can open jupyter notebook web interface in my local machine.
I followed the instructions from this Google Cloud Dataproc tutorial: https://cloud.google.com/dataproc/docs/tutorials/jupyter-notebook
I created ssh funnel with the following command as advised:
gcloud compute ssh --zone=<cluster-zone> --ssh-flag="-D" --ssh-flag="10000" --ssh-flag="-N" "<cluster-name>-m"
And opened web interface:
<browser executable path> \
"http://<cluster-name>-m:8123" \
--proxy-server="socks5://localhost:10000" \
--host-resolver-rules="MAP * 0.0.0.0 , EXCLUDE localhost" \
--user-data-dir=/tmp/
It worked perfectly fine first time I tried.
However, once I turned my goole compute engine off and turned it on after a while, the exact same commands doesn't work, giving out error message below:
debug1: Connection to port 10000 forwarding to socks port 0 requested.
debug2: fd 8 setting TCP_NODELAY
debug3: fd 8 is O_NONBLOCK
debug3: fd 8 is O_NONBLOCK
debug1: channel 2: new [dynamic-tcpip]
debug2: channel 2: pre_dynamic: have 0
debug2: channel 2: pre_dynamic: have 3
debug2: channel 2: decode socks5
debug2: channel 2: socks5 auth done
debug2: channel 2: pre_dynamic: need more
debug2: channel 2: pre_dynamic: have 0
debug2: channel 2: pre_dynamic: have 19
debug2: channel 2: decode socks5
debug2: channel 2: socks5 post auth
debug2: channel 2: dynamic request: socks5 host cluster-1-m port 8123 command 1
channel 2: open failed: connect failed: Connection refused
debug2: channel 2: zombie
debug2: channel 2: garbage collecting
debug1: channel 2: free: direct-tcpip: listening port 10000 for cluster-1-m port 8123, connect from ::1 port 49535 to ::1 port 10000, nchannels 3
debug3: channel 2: status: The following connections are open:
Waiting for help:D
回答1:
The Jupyter notebook kernel is not relaunched after reboots. You'll need to manually restart the notebook yourself once the machine has booted, e.g.:
gcloud compute ssh <cluster-name>-m
nohup /usr/local/bin/miniconda/bin/jupyter notebook --no-browser > /var/log/jupyter_notebook.log 2>&1 &
Once the kernel is up and running, you should be able to access the web UI by proxy.
Note: In general, Dataproc does not support stopping or restarting the entire cluster.
来源：https://stackoverflow.com/questions/42556490/dynamic-port-forwarding-fails-after-turning-off-and-on-google-cloud-virtual-mach