1.ip与hostname绑定
vi /etc/hosts
192.168.18.111 h1
192.168.18.112 h2
192.168.18.113 h3
2.免秘钥配置
[hadoop@h1 ~]$ ssh-keygen -t rsa
[hadoop@h2 ~]$ ssh-keygen -t rsa
[hadoop@h3 ~]$ ssh-keygen -t rsa
[hadoop@h1 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h1
[hadoop@h1 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h2
[hadoop@h1 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h3
[hadoop@h2 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h1
[hadoop@h2 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h2
[hadoop@h2 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h3
[hadoop@h3 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h1
[hadoop@h3 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h2
[hadoop@h3 ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub h3