环境：
三台Linux 服务器
IP Release Hostname
192.168.31.135 centos6.5 HDFS
192.168.31.133 centos6.5 HDFS-01
192.168.31.134 centos6.5 HDFS-02
配置HDFS 无密连接HDFS-01、HDFS-02
[root@HDFS ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
6b:f0:c3:1e:f3:bd:00:3b:50:cf:66:c6:d0:42:66:3d root@HDFS
The key's randomart image is:
+--[ RSA 2048]----+
| +. |
| + .E |
| + .. |
| . * |
| o S B |
| = B |
| @ . |
| o * o |
| . . o. |
+-----------------+
在 .ssh 目录下生成公钥和私钥：
[root@HDFS .ssh]# ll
total 8
-rw-------. 1 root root 1679 Oct 9 15:34 id_rsa
-rw-r--r--. 1 root root 391 Oct 9 15:34 id_rsa.pub将公钥复制到需要免密连接的服务器上（HDFS-01、HDFS-02）
[root@HDFS .ssh]# ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]
The authenticity of host '192.168.31.133 (192.168.31.133)' can't be established.
RSA key fingerprint is aa:0a:2f:20:c3:58:c5:00:da:8f:9d:ba:23:25:3e:ac.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.31.133' (RSA) to the list of known hosts.
[email protected]'s password:
Now try logging into the machine, with "ssh '[email protected]'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.免密登录： ssh 192.168.31.133
[root@HDFS .ssh]# ssh 192.168.31.133
Last login: Tue Oct 9 15:29:22 2018 from hdfs
[root@HFDY-01 ~]# exit