linux中集群的免秘钥SSH直接登录

这里以三台mysql的主从服务器为例：manage、master、slave1、slave2

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给4个机器生成秘钥文件

以manage为例，执行命令，生成空字符串的秘钥(后面要使用公钥)，命令是：

[ [email?protected] ~]# ssh-keygen? -t rsa -P ‘‘
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory ‘/root/.ssh‘.
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:
96:7e:3c:32:f2:44:e4:bc:79:6f:dd:b8:4e:46:17:37 [email?protected]
The key‘s randomart image is:
+--[ RSA 2048]----+
|???????????????? |
|???????????????? |
|??????? .????? E.|
|?????? + .????? +|
|??????? S???? . .|
|?????? + +?? . . |
|????? . B =? .oo |
|?????? + = o.oo .|
|??????? .? ...o. |
+-----------------+

[ [email?protected] ~]# cd /root/
[ [email?protected] ~]# ll .ssh/
total 8
-rw-------. 1 root root 1675 Apr 28 10:24 id_rsa
-rw-r--r--. 1 root root? 408 Apr 28 10:24 id_rsa.pub
[ [email?protected] ~]# cd .ssh/
[ [email?protected] .ssh]# ls
id_rsa? id_rsa.pub
[ [email?protected] .ssh]# cp id_rsa.pub authorized_keys?? #### 将id_rsa.pub公钥拷贝重命名authorized_keys文件。

[ [email?protected] .ssh]# ls
authorized_keys? id_rsa? id_rsa.pub

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使用同样的方法为master、slave1和slave2生成秘钥(命令完全相同，不用做如何修改)：

[ [email?protected] ~]# ssh-keygen? -t rsa -P ‘‘

[ [email?protected] ~]# ssh-keygen? -t rsa -P ‘‘

[ [email?protected] ~]# ssh-keygen? -t rsa -P ‘‘

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#登录master、slave1、slave2,将公钥拷贝到manage的authorized_keys中

[ [email?protected] ~]# scp?/root/.ssh/authorized_keys?[email?protected]_ip:/root/.ssh/authorized_keys

[ [email?protected] ~]# scp?/root/.ssh/authorized_keys?[email?protected]_ip:/root/.ssh/authorized_keys

[ [email?protected] ~]# scp?/root/.ssh/authorized_keys?[email?protected]_ip:/root/.ssh/authorized_keys

注意第一次ssh登录时需要输入密码，再次访问时即可免密码登录。

测试连接成功的情况：
在manage机器上机器上运行：