ssh密匙互信操作【原创】

1、简便ssh密匙信任方法

只在一台服务器上创建ssh-keygen

[root@SMSJKSRVBJ02 ~]# ssh-keygen
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:
da:::ed::::8b::e6::ea:ab::bc:5f root@SMSJKSRVBJ02
The key's randomart image is:
+--[ RSA ]----+
|oo  o.           |
|*. o o           |
|..o . .          |
|.    o o         |
| .  . * S        |
| ..  = +         |
| .+ . E .        |
|.o . . .         |
|. ...            |
+-----------------+

[root@SMSJKSRVBJ02 ~]# cd .ssh/

[root@SMSJKSRVBJ02 .ssh]# ll -thr
total 12K
-rw-r--r--  root root   Mar  : known_hosts
-rw-r--r--  root root   Mar  : id_rsa.pub
-rw-------  root root .7K Mar  : id_rsa

[root@SMSJKSRVBJ02 .ssh]# cat id_rsa.pub >> authorized_keys

将密匙传到别的服务器

[root@SMSJKSRVBJ02 .ssh]# scp * root@10.70.69.153:~/.ssh/
[root@SMSJKSRVBJ02 .ssh]# scp * root@10.70.69.152:~/.ssh/
[root@SMSJKSRVBJ02 .ssh]# scp * root@10.70.69.151:~/.ssh/

如果报错，

[root@SMSJKSRVBJ02 .ssh]# scp * root@10.70.69.152:~/.ssh/
The authenticity of host '10.70.69.152 (10.70.69.152)' can't be established.
RSA key fingerprint is :::::::ad:da:aa:2f:9f:2c:8a:ea:.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.70.69.152' (RSA) to the list of known hosts.
root@10.70.69.152's password:
scp: /root/.ssh/: No such file or directory

说明对方没有ssh-keygen生成.ssh目录，去登陆服务器执行ssh-keygen

因为使用密匙相同，这4台服务器之间就互相信任可以互相访问了。

2、标准的方法

配置SSH登录无密码验证（使用key登录，工作中常用，最好不要禁掉密码登录，如果禁了，可能会有问题）

在server02 192.168..131操作（Monitor）：

192.168.2.131 [root ~]$ ssh-keygen -t rsa
192.168.2.131 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.128
192.168.2.131 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.129
192.168.2.131 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.130

在server02 192.168..128操作（Master）：

192.168.2.128 [root ~]$ ssh-keygen -t rsa
192.168.2.128 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.129
192.168.2.128 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.130

在server03 192.168..129操作(slave)：

192.168.2.129 [root ~]$ ssh-keygen -t rsa
192.168.2.129 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.128
192.168.2.129 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.130

在server04 192.168..130操作(slave)：
192.168.2.130 [root ~]$ ssh-keygen -t rsa
192.168.2.130 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.128
192.168.2.130 [root ~]$ ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.2.129

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