Metadata - ssh keys
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If you don't have one yet, create an shh key on your computer
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Paste the public key there
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Try to ssh to the instance from a regular SSH client.
alias xscp='scp -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'
alias xssh='ssh -q -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no'