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mac 系统开始就已经为我们安装了ssh 如果没有安装没，首先安装；
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打开终端：$ ssh -v
查看ssh版本
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]
[-D [bind_address:]port] [-e escape_char] [-F configfile]
[-I pkcs11] [-i identity_file]
[-L [bind_address:]port:host:hostport]
[-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
[-R [bind_address:]port:host:hostport] [-S ctl_path]
[-W host:port] [-w local_tun[:remote_tun]]
[user@]hostname [command]
这个表明ssh已经安装， -
打开终端，$ ssh-keygen 一路enter下。
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$ ls -a ~/.ssh 通过搜索目录，会发现生成的两个秘钥，一个私钥、一个公钥
秘钥.png
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id_rsaid_rsa.pub为公钥，即要用到的
