Linux下SSH免密码登录
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搭建hadoop集群的时候一定会用到的就是SSH免密码登录
- [hadoop@hadoop1 ~]$ ssh-keygen -t rsa
- Generating public/private rsa key pair.
- Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
- Enter passphrase (empty for no passphrase):
- Enter same passphrase again:
- Your identification has been saved in /home/hadoop/.ssh/id_rsa.
- Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
- The key fingerprint is:
- 26:96:da:89:60:3d:90:75:43:bf:eb:56:d1:52:d9:68 hadoop@hadoop1
- The key's randomart image is:
- +--[ RSA 2048]----+
- | ..+ + |
- | o . o E . |
- | o . + |
- | o . .o . |
- | o o + S o |
- | . . * + .. |
- | o o .. |
- | .. |
- | .. |
- +-----------------+
- [hadoop@hadoop1 ~]$ cd .ssh
- [hadoop@hadoop1 .ssh]$ scp -r id_rsa.pub hadoop@hadoop3:/home/hadoop/.ssh/authorized_keys
- The authenticity of host 'hadoop3 (192.168.127.120)' can't be established.
- RSA key fingerprint is 03:be:af:08:19:27:6d:15:7e:dd:90:fa:09:b3:14:2f.
- Are you sure you want to continue connecting (yes/no)? yes
- Warning: Permanently added 'hadoop3,192.168.127.120' (RSA) to the list of known hosts.
- hadoop@hadoop3's password:
- id_rsa.pub 100% 396 0.4KB/s 00:00
- [hadoop@hadoop1 .ssh]$ ssh hadoop3
- Last login: Sat Aug 4 17:35:22 2012 from hadoop1
如果不能没有成功
方法一:
- [hadoop@hadoop3 ~]$ chmod 700 .ssh/
- [hadoop@hadoop3 ~]$ cd .ssh
- [hadoop@hadoop3 .ssh]$ chmod 600 authorized_keys
方法二:
- [root@hadoop3 .ssh]# vi /etc/ssh/sshd_config
- AuthorizedKeysFile .ssh/authorized_keys 把前面的#号去掉
- [root@hadoop3 .ssh]# /etc/rc.d/init.d/sshd restart
- Stopping sshd: [ OK ]
- Starting sshd: [ OK ]
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