Hello Mahsa,
looking closer to the log you sent, I stand corrected: in your case,
authentication to Google Cloud works fine, the VMs are started but
then you get an error when connecting to the nodes via SSH:
> 2020-08-19 20:00:34 8b4b8daccab1 elasticluster[1] INFO Node `frontend001` has
> been started.
> [...]
> 2020-08-19 20:00:35 8b4b8daccab1 elasticluster[1] DEBUG Trying to connect to
> host frontend001 using IP address 35.247.91.95 ...
> [...]
> 2020-08-19 20:00:48 8b4b8daccab1 elasticluster[1] ERROR Invalid SSH host key
> for frontend001 (35.247.91.95): Host key for server '35.247.91.95' does not
> match: got
> 'AAAAC3NzaC1lZDI1NTE5AAAAIAst0nVJA8hdGlFbWfCEc4g40ClovlxinZpo4tyWKSf1',
> expected
> 'AAAAC3NzaC1lZDI1NTE5AAAAIDtTlFoPtYb3Rn0m0WJ7PFyLyO632iOCdCK8udsd7puk'.
This may be due to the SSH keys of some old VM being incorrectly
cached in the "known_hosts" file.
Can you please try removing the `*.know_hosts` files under your
`$HOME/.elasticluster/storage` directory? This command should do it:
rm -f -v $HOME/.elasticluster/storage/*/*.known_hosts
After removing the files, try starting a cluster again.
Ciao,
Riccardo
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