SSH基于密钥登录方式部署流程

第一个里程：在管理主机上创建密钥对信息

ssh-keygen -t dsa      <-- 创建密钥对命令 -t dsa表示指定密钥对加密类型
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa):      <-- 确认私钥文件所保存的路径
/root/.ssh/id_dsa already exists.
Overwrite (y/n)? y                                            <-- 如果已经存在了密钥对信息，是否进行覆盖
Enter passphrase (empty for no passphrase):                   <-- 确认是否给私钥设置密码信息（一般为空）
Enter same passphrase again:                                  
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
46:c8:21:b9:99:6e:0c:59:39:66:38:7a:97:29:51:76 root@m01
The key's randomart image is:
+--[ DSA 1024]----+
|   o+oE          |
|  +.B+ o         |
| . B Bo .        |
|. = B  .         |
| . *    S        |
|    +  .         |
|   .             |
|                 |
|                 |
+-----------------+

第二个里程：将管理主机上公钥信息发送给被管理主机

ssh-copy-id -i /root/.ssh/id_dsa.pub 172.16.1.31(注：这里的ip就是秘钥登录指定的ip)
[email protected]'s password: 
Now try logging into the machine, with "ssh '172.16.1.31'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

第三个里程：进行远程管理测试（基于密钥的方式进行远程管理）

ssh 172.16.1.31        <-- 可以不用输入密码信息，就能登陆成功
ssh 172.16.1.31 uptime <-- 可以不用登陆到远程主机，就可以直接查看远程主机信息