SSH 免密码登录

本机服务器

$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

$ ssh localhost 

OK

将 id_dsa.pub 追加到 免密码登录的 ~ /.ssh/authorized_keys 中

远程服务器

$ ssh-copy-id -i ~/.ssh/id_rsa.pub username@hostname

$ ssh  username@hostname