PHP checks whether the public key is available

How to use RSA public key for ssh remote login verification
1. Generate the key on the local machine

$ssh-keygen -t
rsa

Generate the second version of the key based on the ssh protocol. If you still use rsa1, it is time to upgrade.
2. Copy the generated id_rsa.pub public key file to the remote server

$scp
id_rsa.pub bsduser@192.168.1.188:mykey.pub

3. Log in to the remote server with password

$ssh 192.168.1.188
-l bsduser

Note here that it is not cp, but cat; not ">", but the operation of ">>":

%cat mykey.pub
>> $HOME/.ssh/authorized_keys

4. Restart sshd

#/etc/rc.d/sshd
restart

5. If the login test

$ssh
bsduser@192.168.1.188

succeeds, you don’t need to enter a complicated and easily leaked password. But the condition is that you must protect your key file information.

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