1.開啓sshd服務
功能：讓遠程主機可以通過網絡訪問sshd服務，開始一個安全shell
systemctl start sshd ##開啓sshd服務
systemctl status sshd ##查看sshd服務狀態若爲active (running)則開啓正常
2.客戶端連接
ssh 遠程主機用戶@遠程主機ip ##調用遠程主機打開一個shell無圖形
ssh 遠程主機用戶@遠程主機ip -X ##調用遠程主機圖形工具
ssh 遠程主機用戶@遠程主機ip command ##直接在遠程主機運行某條命令
[kiosk@foundation62 Desktop]$ ssh [email protected]
The authenticity of host ‘172.25.254.10 (172.25.254.10)’ can’t be established.
ECESA key fingerprint is eb:24:07:96:26:b1:04:c2:37:0c:78:2d:bc:b0:08.
Are you sure you want to continue connecting (yes/no)? yes ##連接陌生主機時需要建立認證關係
Warning: Permanently added ‘172.25.254.10’ (ECDSA) to the list of known hosts.
[email protected]’s password: ##遠程用戶密碼
Last login: Sat Jan 14 10:09:19 2017
[root@localhost ~]# ##登陸成功
3.提升ssh的安全級別
/etc/ssh/sshd_config ##sshd配置文件
78 PasswordAuthentication yes|no ##是否開啓用戶密碼認證，yes爲支持no爲關閉
48 PermitRootLogin yes/no ##是否允許root連接
49 AllowsUsers username1 username2 … ##僅允許username1和username2訪問
50 DenyUsers username1 username2 ##僅拒絕username1和username2訪問
4.sshkey加密
/etc/ssh/sshd_config ##sshd配置文件
1)ssh-keygen ##生成鎖的初始文件
[root@localhost Desktop]# ssh-keygen ##生成公鑰私鑰工具
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): ##加密字符保存文件（建議用默認）
Enter passphrase (empty for no passphrase): ##密鑰密碼，必須>4個字符
Enter same passphrase again: ##確認密碼
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:
45:a7:e3:62:9f:60:ea:3c:ab:59:41:15:ce:a4:44:e2 root@localhost
The key’s randomart image is:
+–[ RSA 2048]—-+
| ..o +.. . |
| . o * . o |
| E o o + |
| . o . |
| . S . |
| = + . |
| o o |
| =. |
| o.+o |
+—————–+
[root@localhost Desktop]# ls /root/.ssh/
id_rsa ##私鑰，就是鑰匙
id_rsa.pub ##公鑰，就是鎖
2)ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected] ##根據初始文件生成相應鎖文件
ssh-copy-id ##添加key認證方式的工具
-i ##指定加密key文件
/root/.ssh/id_rsa.pub ##加密key
root ##加密用戶爲root
172.25.254.10 ##被加密主機ip
3)修改/etc/ssh/sshd_config中PasswordAuthentication yes/no ##開啓/取消密碼訪問
4)scp /home/ser/.ssh/id_rsa [email protected]:/home/user/.ssh/ ##發送鑰匙文件
服務器端要發送的文件位置 用戶@用戶ip地址:保存到用戶指定位置
