centOs 6.5 ssh配置无密码登入
1.安装ssh(若没安装的话)
sudo apt-get install ssh
2.配置为可以免密码登陆本机。
2.1查看在master用户下是否存在.ssh文件夹(ssh前面有.的是隐藏文件夹),输入命令ls -a /home/master。我的没有,所以新建个mkdir /home/master/.ssh
2.2生成私钥和公钥:ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
2.3把公钥(id_dsa.pub)追加到授权的key中去:cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
3.验证ssh是否安装成功:ssh -version
显示:
OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012
Bad escape character 'rsion'.
则说明安装成功
输入命令:ssh localhost
显示:
The authenticity of host 'localhost (127.0.0.1)' can't be established.
ECDSA key fingerprint is 34:69:fc:a8:92:c0:53:1e:06:1b:da:ef:44:1a:05:de.
Are you sure you want to continue connecting (yes/no)?
输入yes,显示:
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Welcome to Ubuntu 12.04.1 LTS (GNU/Linux 3.2.0-29-generic-pae i686)
* Documentation: https://help.ubuntu.com/
Last login: Sun Jun 23 06:21:25 2013 from 192.168.159.1
说明安装成功(第一次登陆时会询问是否继续连接,输入yes即可连接)
实际上,在Hadoop的安装过程中,是否免密码登陆是无关紧要的,但是如果不配置免密码登陆,每次启动hadoop都需要输入密码以登陆到每台DataNode上。不配置免密码登陆时,当集群大了,就会很头疼。
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