什么是ssh
管理员可以通过远程登陆的方式，对通过网相连的分散于各处的多台主机进行管理操作。
管理员可以对远程主机进行如下操作：
遗憾的事情是：这些操作不安全！
使用纯文本口令，并用明文发送
在日常操作练习时，用ssh登录其他主机时，可能会每次都需要输入登录密码，哪怕用scp复制东西也需要。
为了更方便快捷的切换主机，ssh免密通信不失为更好的选择；
用ssh-keygen生成密钥，默认保存在本地的/root/.ssh/id_rsa
然后在用ssh-copy-id分发至目标主机之上；登录用户@主机名或IP地址
注意：
1.最好是用主机名，在/etc/hosts文件中写入主机名和对应的IP地址；
2.免密通信需要双方相互认证，所以也需要在目标主机对本机做一次相同的操作；
[root@www ~]# ssh-keygen -t rsa -P '' Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): /root/.ssh/id_rsa already exists. Overwrite (y/n)?
[root@www ~]#ssh-copy-id -i .ssh/id_rsa.pub root@172.16.75.1 /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub" The authenticity of host '172.16.75.1 (172.16.75.1)' can't be established. ECDSA key fingerprint is SHA256:YXhbTS9MfK2IQC4gtOW4RL8voHvFqC1cAAMJXuF3Wec. ECDSA key fingerprint is MD5:2c:c0:94:e8:3a:e4:74:88:c0:d8:e0:01:20:81:1d:8e. Are you sure you want to continue connecting (yes/no)? yes /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys root@172.16.75.1's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'root@172.16.75.1'" and check to make sure that only the key(s) you wanted were added.
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