1.在服務機上操作
創建要遠程登錄的用戶和密碼
sudo adduser username
正在添加用戶“username”...
正在添加新組“username”(1001)...
正在添加新用戶“username”(1001)到組“username”...
創建主目錄“/home/username”...
正在從“/etc、skel”復制文件...
輸入新的 UNIX 口令：(此處大家注意，不是輸入你當前用戶的密碼，而是輸入你要創建新用戶的密碼)
重新輸入新的 UNIX 口令：(再輸一次即可)
passwd：已成功更新密碼
Changing the user information for username
Enter the new value, or press ENTER for the default
Full Name []: yangyang (輸入新用戶的名稱)
Room Number []:
Work Phone []:
Home Phone []:
Other []:
這個信息是否正確? [Y/n] y
2.在客戶機上操作（其他機器也行，主要是用來創建密鑰對）
2.1.創建ssh-key
[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: SHA256:W05lCKLqZ8FWTyAwTsUrBzg7HRzZfZ8ZbacHg/Wnf6c root@node1 The key's randomart image is: +---[RSA 2048]----+ | o=Bo.o . +. | |oo=.oo.o..o.=.. | | +.o.......=o=. .| |o ooo. o +o. .o | | ..o+ S o .. | | . . . = . | | . o . . +| | o .o| | E | +----[SHA256]-----+
2.2.把生成的的秘鑰拷貝到服務器，
兩種可選方式
方式一：可以手動拷貝
手動拷貝剛剛生成的公鑰id_rsa.pub（在當前用戶家目錄的.ssh/id_rsa.pub），將里面的內容追加到要登錄的服務器的目標用戶家目錄下的.ssh/ authorized_keys中，這里是/home/jundong.ssh/ authorized_keys
方式二：直接用命令拷貝
ssh-copy-id可以方便快捷地把公鑰追加到到服務端的authorized_keys文件中,注意用戶名，輸入密碼
ssh-copy-id jundong@120.78.150.47我的操作
[root@node1 ~]# ssh-copy-id jundong@120.78.150.47 /usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub" The authenticity of host '120.78.150.47 (120.78.150.47)' can't be established. ECDSA key fingerprint is SHA256:KwfKwzN4xqw7/VxoVw5IoTi0NhUPZ+h2fSQXi3zgXXY. ECDSA key fingerprint is MD5:22:b0:8e:c0:21:e6:96:b1:de:bd:bd:c4:08:d9:bf:4d. Are you sure you want to continue connecting (yes/no)? yes /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys jundong@120.78.150.47's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'jundong@120.78.150.47'" and check to make sure that only the key(s) you wanted were added.
方式三：在阿里雲控制台導入
【在控制台導入證書，阿里雲做的事是：將公鑰追加到/root/.ssh/authorized_keys中；修改/etc/ssh/sshd_config,把PasswordAuthentication改成no】
1.這種方式會默認把密碼登錄禁用，只能使用秘鑰登錄，可以自己手動打開（修改/etc/ssh/sshd_config,把PasswordAuthentication改成yes）
2.這種方式只能使用root用戶登錄，其他用戶不能使用這種方式導入，因為控制台導入只會導入到/root/.ssh/authorized_keys，不會導入到其他用戶目錄
復制剛剛生成的公鑰id_rsa.pub（在當前用戶家目錄的.ssh/id_rsa.pub），這里是/home/jundong.ssh/ authorized_keys，粘貼到控制台的文本框確定即可，再將密鑰對綁定到指定服務器 
參考鏈接：https://help.aliyun.com/document_detail/51794.html?spm=5176.doc51793.6.707.1A6GMv
3.測試
3.1在生成秘鑰那台客戶機上
[root@node1 ~]# ssh jundong@120.78.150.47 Welcome to Alibaba Cloud Elastic Compute Service ! [jundong@izwz97s23bov6qmem6poj8z ~]$