（二）配置ssh無密碼訪問集羣機器
master節點
root@master:/home# su - spark spark@master:~$ spark@master:~$ ssh-keygen -t rsa #一直enter鍵
spark@master:~$ cd .ssh/ spark@master:~/.ssh$ ls id_rsa id_rsa.pub spark@master:~/.ssh$ cat id_rsa.pub > authorized_keys spark@master:~/.ssh$ scp spark@master:~/.ssh/id_rsa.pub ./master_rsa.pub
spark@master:~/.ssh$ ls authorized_keys id_rsa id_rsa.pub known_hosts master_rsa.pub spark@master:~/.ssh$ cat master_rsa.pub >>authorized_keys
worker1節點
與master節點執行過程相同
worker2節點
與master節點執行過程相同
執行完上述操作之後：
master節點：
spark@master:~/.ssh$ scp spark@worker1:~/.ssh/id_rsa.pub ./worker1_rsa.pub
注意是在./ssh目錄下
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節點
spark@worker1:~/.ssh$ scp spark@worker2:~/.ssh/id_rsa.pub ./worker2_rsa.pub cat worker2_rsa.pub >>authorized_keys
worker2節點
spark@worker2:~/.ssh$ scp spark@worker1:~/.ssh/id_rsa.pub ./worker1_rsa.pub cat worker1_rsa.pub >>authorized_keys
驗證是否配置成功
從master節點分別登陸自身、worker1節點與worker2節點（可能第一次需要密碼、退出後，第二次重新ssh則不需要密碼）
spark@master:~/.ssh$ ssh master
spark@master:~/.ssh$ ssh worker1
spark@master:~/.ssh$ ssh worker2
從worker1節點登陸自身、master節點與worker2節點（可能第一次需要密碼、退出後，第二次重新ssh則不需要密碼）
spark@worker1:~/.ssh$ ssh master
spark@worker1:~/.ssh$ ssh worker1
spark@worker1:~/.ssh$ ssh worker2
從worker2節點登陸自身、master節點與worker1節點（可能第一次需要密碼、退出後，第二次重新ssh則不需要密碼）
spark@worker2:~/.ssh$ ssh master
spark@worker2:~/.ssh$ ssh worker1
spark@worker2:~/.ssh$ ssh worker2
注意，登陸到其他節點後，一定要記得退出
下文中，將開始安裝hadoop。。。