The ultimate solution regarding ssh key configuration also need to enter a password

Some time after the transfer key how debugging will not work, such as modifying chmod 600 id_rsa, there chmod 700 ~ / .ssh, of course, these two are a must, ordinary users do not have ~ / .ssh need to manually create must be revised to 700 permission.

There are profiles add open

RSAAuthentication yes
PubkeyAuthentication yes 

Then restart systemctl restart sshd

After these still did not work, because you ssh-copy-id -i ~ / .ssh / id_rsa.pub [email protected]

Get is to let you use

Number of key(s) added: 1

Now try logging into the machine, with: "ssh '[email protected]'"
and check to make sure that only the key(s) you wanted were added.

 

But in reality you need to specify its own private landing: SSH -i ~ / .ssh / id_rsa [email protected]