enable both password and key file to ssh logon in ?
one vps server and two client machine.
Can i set the vps server to be logon in via password on machine 1 at the same time to be logon in via key file on machine 2?
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Yes, that's the default setting actually. Just set up an SSH key for your user and when you connect to your droplet without an ssh key (machine 2) it will fall back to a password prompt.
SSH keys provide a more secure way of logging into a virtual private server with SSH than using a password alone. With SSH keys, users can log into a server without a password. This tutorial explains how to generate, use, and upload an SSH Key Pair.