（二）配置ssh无密码访问集群机器
master节点
root@master:/home# su - sparkspark@master:~$
spark@master:~$ ssh-keygen -t rsa
#一直enter键
spark@master:~$ cd .ssh/spark@master:~/.ssh$ lsid_rsa id_rsa.pubspark@master:~/.ssh$ cat id_rsa.pub > authorized_keysspark@master:~/.ssh$ scp spark@master:~/.ssh/id_rsa.pub ./master_rsa.pub
spark@master:~/.ssh$ lsauthorized_keys id_rsa id_rsa.pub known_hosts master_rsa.pubspark@master:~/.ssh$ cat master_rsa.pub >>authorized_keys
worker1节点
与master节点执行过程相同
worker2节点
与master节点执行过程相同
执行完上述操作之后：
master节点：
spark@master:~/.ssh$ scp spark@worker1:~/.ssh/id_rsa.pub ./worker1_rsa.pub
注意是在./ssh目录下
spark@master:~/.ssh$ cat worker1_rsa.pub >>authorized_keys spark@master:~/.ssh$ scp spark@worker2:~/.ssh/id_rsa.pub ./worker2_rsa.pub
spark@master:~/.ssh$ cat worker2_rsa.pub >>authorized_keys
worker1节点
spark@worker1:~/.ssh$ scp spark@worker2:~/.ssh/id_rsa.pub ./worker2_rsa.pubcat worker2_rsa.pub >>authorized_keys
worker2节点
spark@worker2:~/.ssh$ scp spark@worker1:~/.ssh/id_rsa.pub ./worker1_rsa.pubcat worker1_rsa.pub >>authorized_keys
验证是否配置成功
从master节点分别登陆自身、worker1节点与worker2节点（可能第一次需要密码、退出后，第二次重新ssh则不需要密码）
spark@master:~/.ssh$ ssh master
spark@master:~/.ssh$ ssh worker1
spark@master:~/.ssh$ ssh worker2
从worker1节点登陆自身、master节点与worker2节点（可能第一次需要密码、退出后，第二次重新ssh则不需要密码）
spark@worker1:~/.ssh$ ssh master
spark@worker1:~/.ssh$ ssh worker1
spark@worker1:~/.ssh$ ssh worker2
从worker2节点登陆自身、master节点与worker1节点（可能第一次需要密码、退出后，第二次重新ssh则不需要密码）
spark@worker2:~/.ssh$ ssh master
spark@worker2:~/.ssh$ ssh worker1
spark@worker2:~/.ssh$ ssh worker2
注意，登陆到其他节点后，一定要记得退出
下文中，将开始安装hadoop。。。
本文出自 “lefteva” 博客，请务必保留此出处http://lefteva.blog.51cto.com/11892835/1873526