Hadoop用户配置ssh免密登录

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[root@hadoop000 ~]# su - hadoop　　#确保有ssh服务
　　[hadoop@hadoop000 ~]$ sudo service sshd status
　　openssh-daemon (pid  24823) is running...
　　[hadoop@hadoop000 ~]$ ssh-keygen
　　Generating public/private rsa key pair.
　　Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
　　Created directory '/home/hadoop/.ssh'.
　　Enter passphrase (empty for no passphrase):
　　Enter same passphrase again:

　　Your>　　Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
　　The key fingerprint is:
　　bd:75:87:ca:44:2d:1f:de:b7:5e:a0:96:ac:b3:7e:01 hadoop@hadoop000
　　The key's randomart image is:
　　+--[ RSA 2048]----+
　　|                 |
　　|             .   |
　　|            o o  |
　　|         .E. + + |
　　|        S ..o * +|
　　|           *.= oo|
　　|          . B. ..|
　　|          .o. . .|
　　|         .++   . |
　　+-----------------+
　　[hadoop@hadoop000 ~]$ cd .ssh
　　[hadoop@hadoop000 .ssh]$ ll
　　total 8

　　-rw------- 1 hadoop hadoop 1675 May 17 14:59>
　　-rw-r--r-- 1 hadoop hadoop  395 May 17 14:59>
　　[hadoop@hadoop000 .ssh]$ cat>　　[hadoop@hadoop000 .ssh]$ ll
　　total 12
　　-rw-rw-r-- 1 hadoop hadoop  395 May 17 14:59 authorized_keys

　　-rw------- 1 hadoop hadoop 1675 May 17 14:59>
　　-rw-r--r-- 1 hadoop hadoop  395 May 17 14:59>　　#authorized_keys权限必须为600
　　[hadoop@hadoop000 .ssh]$ chmod 600 authorized_keys
　　[hadoop@hadoop000 .ssh]$ ssh hadoop000 date
　　The authenticity of host 'hadoop000 (192.168.6.217)' can't be established.
　　RSA key fingerprint is 25:d9:d6:7e:fa:e0:a7:92:7c:06:76:5c:2b:19:bf:a3.
　　Are you sure you want to continue connecting (yes/no)? yes
　　Warning: Permanently added 'hadoop000,192.168.6.217' (RSA) to the list of known hosts.
　　Thu May 17 15:00:28 CST 2018
　　[hadoop@hadoop000 .ssh]$ ssh hadoop000 date
　　Thu May 17 15:00:30 CST 2018