Linux记录-配置无密码登录

1.互信的机器都执行（合并id_rsa.pub文件）

ssh-keygen -t rsa

cat ~/.ssh/id_rsa.pub >> /home/hdfs/.ssh/authorized_keys 

chmod 600 ~/.ssh/authorized_keys

2.拷贝第一台的authorized_keys 到第二台机器

3.追加第二台机器的id_rsa.pub到authorized_keys

cat ~/.ssh/id_rsa.pub >> authorized_keys 

4.拷贝回第一台，替换authorized_keys 

5.ssh nn1   ssh nn2