I have a gcloud vm instance of type custom (4 vCPUs, 8 GB memory), with ubuntu 16.04, 10Gb disk space. Today at specific time (7:30 am), start using the 99% of cpu. I restart the machine but continue to use the 99% of cpu. Now I cannot connect through ssh. There is any workaround to connect to my instance and see what the problem is?? Thank you!!!
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You can connect to the instance through serial port if you want an interactive shell. The command is gcloud compute connect-to-serial-port [INSTANCE_NAME]
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The viewing-serial-port-output for GCE instances also might be helpful in quickly glancing through serial port logs.

Daniel t.
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Thank you very much!! That works great!! I was able to clear the hdd. That was the problem, hdd out of space – Luis Lopez Nov 08 '18 at 13:02