centos6.5配置ssh免秘钥登陆执行pssh命令的讲解

1.检查并安装pssh，yum list pssh

2.因为没有配置免秘钥登陆，pssh命令执行失败。

[root@bogon ]# pssh -h root@192.168.245.129 -i uptime
[1] 11:00:36 [failure] root@192.168.245.129 exited with error code 255
stderr: the authenticity of host '192.168.245.129 (192.168.245.129)' can't be established.
rsa key fingerprint is 84:2d:70:33:1c:45:fa:e6:4b:94:72:7e:10:98:7c:a8.
are you sure you want to continue connecting (yes/no)? 
host key verification failed.

3.生成秘钥。

[root@bogon tmp]# ssh-keygen -t rsa
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:
9e:14:9a:cc:8d:9b:fd:51:c5:68:24:e1:ce:c6:d7:33 root@bogon
the key's randomart image is:
+--[ rsa 2048]----+
|     o..  |
|     . o o  |
|    . . o o |
|   o = = . o  |
|   * s = o e |
|    * o o  o |
|   o + .   |
|     . .   |
|     .   |
+-----------------+

[root@bogon .ssh]# ll
total 8
-rw------- 1 root root 1675 aug 22 11:06 id_rsa
-rw-r--r-- 1 root root 392 aug 22 11:06 id_rsa.pub

4.拷贝到被管对象。

[root@bogon .ssh]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.245.129
the authenticity of host '192.168.245.129 (192.168.245.129)' can't be established.
rsa key fingerprint is 84:2d:70:33:1c:45:fa:e6:4b:94:72:7e:10:98:7c:a8.
are you sure you want to continue connecting (yes/no)? yes
warning: permanently added '192.168.245.129' (rsa) to the list of known hosts.
reverse mapping checking getaddrinfo for bogon [192.168.245.129] failed - possible break-in attempt!
root@192.168.245.129's password: 
now try logging into the machine, with "ssh 'root@192.168.245.129'", and check in:
 .ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.

5.pssh命令执行成功。

[root@bogon .ssh]# pssh -h root@192.168.245.129 -i uptime
[1] 11:10:39 [success] root@192.168.245.129
 20:10:39 up 2:07, 1 user, load average: 0.00, 0.00, 0.00

总结

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