openSSH是基于C/S架构工作的。
服务器端 //sshd，配置文件在/etc/ssh/sshd_config
客户端 //ssh，配置文件在/etc/ssh/ssh_config
ssh-keygen //密钥生成器
ssh-copy-id //将公钥传输至远程服务器
scp //跨主机安全复制工具
[root@wangjiayue ~]# ls /etc/ssh/
moduli sshd_config ssh_host_ecdsa_key.pub ssh_host_ed25519_key.pub
ssh_host_rsa_key.pub
ssh_config ssh_host_ecdsa_key ssh_host_ed25519_key ssh_host_rsa_key
//SecureShell示例
//以当前用户身份创建远程交互式shell，然后在结束时使用exit命令返回到之前的shell
[root@wangjiayue ~]# ssh 192.168.232.134
The authenticity of host '192.168.232.134 (192.168.232.134)' can't be established.
ECDSA key fingerprint is SHA256:L2m6x3uF77OAwvjVv7g8AmXH1GEWUzO1K/xQn9mnShw.
ECDSA key fingerprint is MD5:f3:e6:bd:3a:f5:61:02:36:1f:ec:91:4c:3b:ff:fb:7e.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.232.134' (ECDSA) to the list of known hosts.
root@192.168.232.134's password:
Last login: Mon Apr 27 05:41:42 2020 from 192.168.232.1
[root@wangjiayue ~]# exit
logout
Connection to 192.168.232.134 closed.
[root@wangjiayue ~]# useradd wang //创建一个新的用户
[root@wangjiayue ~]# id wang
uid=1000(wang) gid=1000(wang) groups=1000(wang)
//以其他用户身份（remoteuser）在选定主机（remotehost）上连接到远程`shell`
[root@wangjiayue ~]# ssh wang@192.168.232.134
wang@192.168.232.134's password:
[wang@wangjiayue ~]$ exit
logout
Connection to 192.168.232.134 closed.
[root@wangjiayue ~]#
//以远程用户身份（remoteuser）在远程主机（remotehost）上通过将输出返回到本地显示器的方式来执行单一命令
[root@wangjiayue ~]# ssh wang@192.168.232.134
wang@192.168.232.134's password:
Last login: Mon Apr 27 06:05:24 2020 from wangjiayue
[wang@wangjiayue ~]$ exit
