hadoop 环境搭建问题

创建一个SSH密钥[root@oplinux ~]# ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsaGenerating public/private rsa key pair./root/.ssh/id_rsa already exists.Overwrite (y/n)? yesYour 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:f8:d4:aa:99:55:23:b3:c9:2e:81:ea:03:69:e9:d7:c9 root@oplinux.hehaibo.com[root@oplinux ~]# cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys[root@oplinux ~]# ssh localhost@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#提示不能通过ssh localhost直接登录 权限有问题 把权限降到0600就okPermissions 0666 for '/root/.ssh/id_rsa' are too open.It is recommended that your private key files are NOT accessible by others.This private key will be ignored.bad permissions: ignore key: /root/.ssh/id_rsaEnter passphrase for key '/root/.ssh/id_rsa': Last login: Tue Mar  6 19:07:51 2012 from 192.168.91.1#解决办法 执行如下命令[root@oplinux ~]# chmod 0600 ~/.ssh/id_rsa#登陆成功[root@oplinux ~]# ssh localhostLast login: Tue Mar  6 19:10:52 2012 from oplinux.hehaibo.com[root@oplinux ~]#