LINUX Centos6 SSH相互无密码访问

LINUX Centos6 SSH互相无密码访问
在CENTOS6下面，　若需要SSH可以无密码访问，　可以做如下处理

1、产生密码，本例是在主机151上执行

ssh-keygen -f /var/lib/pgsql/.ssh/id_rsa -N ''

[root@pg1 ~]# ssh-keygen -f /var/lib/pgsql/.ssh/id_rsa -N ''
Generating public/private rsa key pair.
/var/lib/pgsql/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Your identification has been saved in /var/lib/pgsql/.ssh/id_rsa.
Your public key has been saved in /var/lib/pgsql/.ssh/id_rsa.pub.
The key fingerprint is:
f9:e5:7e:a6:17:3a:ff:29:db:ae:83:67:98:2e:bc:af root@pg1.localdomain
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|                 |
|         .       |
|        S   .    |
|         . o  .  |
|        . . =. . |
|         o =o== .|
|         E*o=XB=.|
+-----------------+

2、将密码复制到想访问的远程主机
本例将151的公钥复制到150和152

[root@pg1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.35.150
Now try logging into the machine, with "ssh 'root@192.168.35.150'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

[root@pg1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.35.152
root@192.168.35.152's password:
Now try logging into the machine, with "ssh 'root@192.168.35.152'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

3、完成，　验证

经验证可以正常访问

另外如果端口不是默认的22，　需要加访问端口