采用证书的方法可以解决ssh不需要输入密码的问题。
本文采用CentOS的操作系统，创建SSH的key，并在两台或多台机器间实现信任。从而实现SSH登录不需要输入密码的功能。
首先，在一台机器上创建SSH Key：
[[email protected] ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory ‘/root/.ssh‘.
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:
e1:9b:9a:b8:4d:ea:2c:e7:0c:49:bd:a7:47:fa:b4:4b [email protected]
The key‘s randomart image is:
+--[ RSA 2048]----+
| |
| |
| . |
| . . . |
| . . S |
| . . .. o |
| o .oE o |
| .+oX.+ |
| =X+B. |
+-----------------+
此时可以在/root/.ssh目录下看到两个文件：
-rw-------. 1 root root 1675 Dec 5 05:02 id_rsa
-rw-r--r--. 1 root root 396 Dec 5 05:02 id_rsa.pub
复制Key到另外一台机器上，使登录这台机器不输入密码：
[[email protected] .ssh]# ssh-copy-id -i id_rsa.pub [email protected]
测试，发现登录ssh 10.1.1.4不需要密码。
把id_rsa和id_rsa.pub复制到10.1.1.4上，在10.1.1.4上做同样的ssh-copy-id的动作，可以使双向ssh登录不需要密码。
且采用的是相同的ssh key。