服务器
1.检查并安装pssh，yum list pssh
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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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文章标题：centos6.5配置ssh免秘钥登陆执行pssh命令的讲解
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