linux ssh 无法连接解决

环境：oracle linux6.3 64bit 3台

ip：分别为192.168.137.11(normal_11.localdomain)、192.168.137.12(normal_12.localdomain)、192.168.137.13(normal_13.localdomain)

使用账户：chenhao01

描述：在做批量分时发现 ssh使用不了显示lost connection

错误演示(我用的自己ip是192.168.137.11)：

[root@normal_11 ~]# scp -r id_rsa.pub 192.168.137.12:/home/chenhao01/.ssh/authorized_keys
The authenticity of host '192.168.137.12 (192.168.137.12)' can't be established.
RSA key fingerprint is 90:76:fa:52:e6:38:ce:4d:eb:84:4e:cf:4a:c1:7d:ed.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.137.12' (RSA) to the list of known hosts.

Connection closed by 192.168.137.12
lost connection

解决思路：当时也是在google搜索 Warning: Permanently added '192.168.137.12' (RSA) to the list of known hosts.这个错误，他们都说要修改/etc/ssh/ssh_config或/etc/ssh/sshd_config发现都没用。

这时我想起之前在做oracle rac时要配置双机信任，其中在 /etc/hosts文件中有相关的ip映射。于是就试一试在192.168.137.11的hosts文件加上看看。

[chenhao01@normal_11 .ssh]$ cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.137.11  normal_11.localdomain
192.168.137.12  normal_12.localdomain
192.168.137.13  normal_13.localdomain

结果发现真的通了。

[chenhao01@normal_11 .ssh]$ scp -r id_rsa.pub 192.168.137.12:/home/chenhao01/.ssh/authorized_keys
[email protected]'s password: 
id_rsa.pub                                                    100%  413     0.4KB/s   00:00  

但是还是不知道这是为什么希望大家来   吐个槽，告诉小弟我谢谢