Hadoop中配置SSH无密码登陆的操作方式以及源代码分贝是什么？

 # ssh-kegen    #一直回车创建秘钥对
  [root@HMaster0] # cat /root/.ssh/id_rsa.pub > /root/.ssh/authorized_keys
  [root@HMaster0] # scp /root/.ssh/authorized_keys root@HMaster0:/root/.ssh
  [root@HMaster0] # scp /root/.ssh/authorized_keys root@HMaster1:/root/.ssh
  [root@HMaster0] # scp /root/.ssh/authorized_keys root@HSlave0:/root/.ssh
  [root@HMaster0] # scp /root/.ssh/authorized_keys root@HSlave1:/root/.ssh
  [root@HMaster0] # scp /root/.ssh/authorized_keys root@HSlave2:/root/.ssh
  [root@HMaster0] # ssh root@HMaster0 'chmod 600 /root/.ssh/authorized_keys && chmod 700 /root/.ssh' 
  [root@HMaster0] # ssh root@HMaster1 'chmod 600 /root/.ssh/authorized_keys && chmod 700 /root/.ssh' 
  [root@HMaster0] # ssh root@HSlave0 'chmod 600 /root/.ssh/authorized_keys && chmod 700 /root/.ssh' 
  [root@HMaster0] # ssh root@HSlave1 'chmod 600 /root/.ssh/authorized_keys && chmod 700 /root/.ssh' 
  [root@HMaster0] # ssh root@HSlave2 'chmod 600 /root/.ssh/authorized_keys && chmod 700 /root/.ssh'