I cannot connect to Gcloud instance using ssh, since cpu is 99.9% of use
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!!!
You could probably try to connect through the serial port :
gcloud compute instances add-metadata INSTANCE --metadata serial-port-enable=1 gcloud compute connect-to-serial-port INSTANCE
Probably the tty on the serial port will be a lot less sensitive to the high CPU usage and you'll be able to log in.
Now, this will ask you for a user and password...what to do if you are (correctly) using only RSA Keypair authentication for ssh? Here there is a quick and dirty hack that does the job:
1 - Set up this as the startup script
echo "root:1234" | chpasswdlike this, for example:
gcloud compute instances add-metadata INSTANCE --metadata startup-script='echo "root:1234" | chpasswd'
2 - Reboot the instance so the startup script is applied
3 - Log in through the serial port
gcloud compute connect-to-serial-port INSTANCE
4 - Use root as username and 1234 as password (or whatever you put in the script)
5 - Don't forget to disable serial port access when you don't need it anymore.