说明:这里面只配置了hadoop102、hadoop103到其他主机的无密登录;因为hadoop102未外配置的是NameNode,hadoop103配置的是ResourceManager,都要求对其他节点无密访问。
(1)hadoop102上生成公钥和私钥:
[atguigu@hadoop102 .ssh]$ ssh-keygen -t rsa
然后敲(三个回车),就会生成两个文件id_rsa(私钥)、id_rsa.pub(公钥)
(2)将hadoop102公钥拷贝到要免密登录的目标机器上
[atguigu@hadoop102 .ssh]$ ssh-copy-id hadoop102[atguigu@hadoop102 .ssh]$ ssh-copy-id hadoop103[atguigu@hadoop102 .ssh]$ ssh-copy-id hadoop104
(3)hadoop103上生成公钥和私钥:
[atguigu@hadoop103 .ssh]$ ssh-keygen -t rsa
然后敲(三个回车),就会生成两个文件id_rsa(私钥)、id_rsa.pub(公钥)
(4)将hadoop103公钥拷贝到要免密登录的目标机器上
[atguigu@hadoop103 .ssh]$ ssh-copy-id hadoop102[atguigu@hadoop103 .ssh]$ ssh-copy-id hadoop103[atguigu@hadoop103 .ssh]$ ssh-copy-id hadoop104