CentOS/RHEL上設定SSH免密碼登入的教程

以下步驟在 CentOS 5/6/7、RHEL 5/6/7 和 Oracle Linux 6/7 上測試通過。

節點1：192.168.0.9 節點2 : 192.168.l.10

步驟一 :

測試節點1到節點2的串連和訪問：

[root@node1 ~]# ssh root@192.168.0.10
The authenticity of host '192.168.0.10 (192.168.0.10)' can't be established.
RSA key fingerprint is 6d:8f:63:9b:3b:63:e1:72:b3:06:a4:e4:f4:37:21:42.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.0.10' (RSA) to the list of known hosts.
root@192.168.0.10's password:
Last login: Thu Dec 10 22:04:55 2015 from 192.168.0.1
[root@node2 ~]#
步驟二：

使用 ssh-key-gen 命令產生公開金鑰和私密金鑰，這裡要注意的是可以對私密金鑰進行加密保護以增強安全性。

[root@node1 ~]# ssh-keygen
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:
b4:51:7e:1e:52:61:cd:fb:b2:98:4b:ad:a1:8b:31:6d root@node1.ehowstuff.local
The key's randomart image is:
+--[ RSA 2048]----+
| . ++ |
| o o o |
| o o o . |
| . o + .. |
| S . . |
| . .. .|
| o E oo.o |
| = ooo. |
| . o.o. |
+-----------------+
步驟三：

用 ssh-copy-id 命令將公開金鑰複製或上傳到遠程主機，並將身份標識檔案追加到節點2的 ~/.ssh/authorized_keys 中：

[root@node1 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.0.10
root@192.168.0.10's password:
Now try logging into the machine, with "ssh '192.168.0.10'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
步驟四：

驗證免密碼 SSH 登入節點2：

[root@node1 ~]# ssh root@192.168.0.10
Last login: Sun Dec 13 14:03:20 2015 from www.ehowstuff.local

有沒有發現配置ssh免密碼登入是非常的簡單的呀，好了到此關於CentOS/RHEL上設定SSH免密碼登入就介紹完了，希望對各位有協助．