步驟如下：

ssh-keygen -t rsa 或 ssh-keygen -d (dsa) => 產生出 id_rsa, id_rsa.pub

scp id_rsa.pub server_hostname:~/.ssh/

ssh server_hostname

cat .ssh/id_rsa.pub >> .ssh/authorized_keys

cat .ssh/id_rsa.pub >> .ssh/authorized_keys2

同時COpy到對方節點。

即可

這樣子就可以key認證登入，不需輸入密碼。