CentOS 配置集群机器之间SSH免密码登录

SSH配置

vi /etc/hosts,用vi编辑hosts文件，如下：

#127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4#::1         localhost localhost.localdomain localhost6 localhost6.localdomain6192.168.1.160 hadoop01192.168.1.161 hadoop02192.168.1.162 hadoop03192.168.1.163 hadoop04192.168.1.164 hadoop05

sudo vim /etc/ssh/sshd_config

开启下面的选项

RSAAuthentication yesPubkeyAuthentication yesAuthorizedKeysFile .ssh/authorized_keys

重启SSH服务

sudo service sshd restart

常见免密码登录失败分析

配置问题

1. 检查配置文件/etc/ssh/sshd_config是否开启了AuthorizedKeysFile选项
2. 检查AuthorizedKeysFile选项指定的文件是否存在并内容正常

目录权限问题

1. ~权限设置为700
2. ~/.ssh权限设置为700
3. ~/.ssh/authorized_keys的权限设置为600

sudo chmod 700 ~sudo chmod 700 ~/.sshsudo chmod 600 ~/.ssh/authorized_keys