切换到本地~/.ssh目录下，执行下面命令生成本地账户的RSA密钥对。需要一个公钥和一个私钥，私钥自己保留，公钥是保存在远程服务器上的。原理是，当你用ssh连接远程服务器的时候，服务器会找到对应的公钥，然后用那个公钥对一串东西进行加密，发送给客户端，客户端必须使用本地的私钥对这串东西进行解密，把结果返回给服务器，服务器核对无误，客户端便成功登录。
root@xiaoxia-pc:~/.ssh# ssh-keygen -trsa Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: eb:2e:9b:ed:2b:e6:0e:d7:ad:dd:ec:50:73:20:ca:77 root@xiaoxia-pc The key's randomart image is: +--[ RSA 2048]----+ | | | | | . . | | . . . . | | S . E . | | . + o o | | . . o o | | o++ o + | | +=*B...+ | +-----------------+
