linux ssh-keygen无密码登录

先确保ssh安装了，master和slave都添加了hadoop用户

第一步，master:

$ ssh-keygen -t dsa -P '' -f /home/hadoop/.ssh/id_dsa

$ cd .ssh/

$ cat id_dsa.pub  >> authorized_keys

$ chmod 600 .ssh/authorized_keys 

$ ssh master

 

第二步，slave:

$ mkdir /home/hadoop/.ssh

$ chmod 700 .ssh

 

第三步，master:

$ scp .ssh/id_dsa.pub hadoop@slave:/home/hadoop/.ssh/

 

第四步，slave:

$ cd .ssh/

$ cat id_dsa.pub >> authorized_keys

$ chmod 600 authorized_keys 

 

第五步，master:

$ ssh slave

 

 

master log:

 

[hadoop@master ~]$ ssh-keygen -t dsa -P '' -f /home/hadoop/.ssh/id_dsa

Generating public/private dsa key pair.

Created directory '/home/hadoop/.ssh'.

Your identification has been saved in /home/hadoop/.ssh/id_dsa.

Your public key has been saved in /home/hadoop/.ssh/id_dsa.pub.

The key fingerprint is:

1c:96:85:88:c2:c5:39:6a:9b:f9:1b:ee:74:da:ff:c5 hadoop@master.hadoop

[hadoop@master ~]$ cd .ssh/

[hadoop@master .ssh]$ ls

id_dsa  id_dsa.pub

[hadoop@master .ssh]$ cat id_dsa.pub  >> authorized_keys

[hadoop@master .ssh]$ ll

total 24

-rw-rw-r-- 1 hadoop hadoop 610 Aug 22 02:54 authorized_keys

-rw------- 1 hadoop hadoop 668 Aug 22 02:53 id_dsa

-rw-r--r-- 1 hadoop hadoop 610 Aug 22 02:53 id_dsa.pub

[hadoop@master .ssh]$ ssh master

The authenticity of host 'master (192.168.2.128)' can't be established.

RSA key fingerprint is 9f:82:3d:8e:ee:00:a4:9e:3f:95:7d:47:2a:2f:d5:0b.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added 'master,192.168.2.128' (RSA) to the list of known hosts.

hadoop@master's password: 

Last login: Thu Aug 22 02:50:22 2013 from slave

[hadoop@master ~]$ ssh master

hadoop@master's password: 

Last login: Thu Aug 22 02:54:45 2013 from master

[hadoop@master ~]$ chmod 600 .ssh/authorized_keys 

[hadoop@master ~]$ ssh master

Last login: Thu Aug 22 02:55:05 2013 from master

 

执行下面的slave log，再接着执行

 

[hadoop@master ~]$ scp .ssh/id_dsa.pub hadoop@slave:/home/hadoop/.ssh/

The authenticity of host 'slave (192.168.2.130)' can't be established.

RSA key fingerprint is 4e:6f:2f:00:99:2f:5a:c4:2a:b3:b8:8f:76:e8:ce:47.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added 'slave,192.168.2.130' (RSA) to the list of known hosts.

hadoop@slave's password: 

id_dsa.pub                                    100%  610     0.6KB/s   00:00    

[hadoop@master ~]$ ssh slave

Last login: Thu Aug 22 02:50:31 2013 from master

 

 

slave log:

 

[hadoop@slave ~]$ mkdir /home/hadoop/.ssh

[hadoop@slave ~]$ chmod 700 .ssh

[hadoop@slave ~]$ ll

total 0

[hadoop@slave ~]$ ll

total 0

[hadoop@slave ~]$ cd .ssh/

[hadoop@slave .ssh]$ ll

total 8

-rw-r--r-- 1 hadoop hadoop 610 Aug 22 02:59 id_dsa.pub

[hadoop@slave .ssh]$ cat id_dsa.pub >> authorized_keys

[hadoop@slave .ssh]$ ll

total 16

-rw-rw-r-- 1 hadoop hadoop 610 Aug 22 03:00 authorized_keys

-rw-r--r-- 1 hadoop hadoop 610 Aug 22 02:59 id_dsa.pub

[hadoop@slave .ssh]$ chmod 600 authorized_keys 

[hadoop@slave .ssh]$ ll

total 16

-rw------- 1 hadoop hadoop 610 Aug 22 03:00 authorized_keys

-rw-r--r-- 1 hadoop hadoop 610 Aug 22 02:59 id_dsa.pub