Redhat Linux之间互相SSH访问无密码设置
这里讲的无密码，不是说用户不设置密码，而是对于信任的客户端登录主机，不用输入密码而已。
假设有两台Linux主机AS-1和AS-2。那么在两台机器上分别执行如下的命令：
[wanghp@AS-1 ~]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/wanghp/.ssh/id_rsa):
Created directory '/home/wanghp/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/wanghp/.ssh/id_rsa.
Your public key has been saved in /home/wanghp/.ssh/id_rsa.pub.
The key fingerprint is:
6f:00:a3:0f:1a:9f:d7:b8:1e:0c:0f:ac:51:b9:02:c0 wanghp@poc4dev
The key's randomart image is:
+–[ RSA 2048]—-+
|o |
|.E . |
|. o o |
| . o o o |
| + B S |
| B O o o |
| o o B . o |
| . o . |
| .o |
+—————–+
[wanghp@AS-1 ~]$ cp /home/wanghp/.ssh/id_rsa.pub /home/wanghp/.ssh/authorized_keys
然后将AS-1中id_rsa.pub的内容拷贝到AS-2中的authorized_keys文件中，将AS-2中id_rsa.pub的内容拷贝到AS-1中的authorized_keys文件中。
如果不行的话，可以检查一下：/etc/ssh/sshd_config文件中的如下配置，将#去掉，重启sshd服务。
#RSAAuthentication yes
#PubkeyAuthentication yes
#AuthorizedKeysFile .ssh/authorized_keys