# 介绍
安全外壳协议（Secure Shell Protocol，简称 SSH）是一种加密的网络传输协议，可在不安全的网络中为网络服务提供安全的传输环境。SSH 通过在网络中建立安全隧道来实现 SSH 客户端与服务器之间的连接。SSH 最常见的用途是远程登录系统，人们通常利用 SSH 来传输命令行界面和远程执行命令。
# 更新 Ubuntu
终端执行以下命令
sudo apt update && sudo apt upgrade -y |
# 安装 OpenSSH
终端执行以下命令
sudo apt install openssh-server -y |
使用 systemctl 开启 SSH 服务
sudo systemctl enable --now ssh |
查看服务运行状态
sudo systemctl enable --now ssh |
查看连接状态
sudo ss -lt |
# 连接 SSH
发起连接终端执行以下命令
ssh username@ip-address/hostname |
连接之后可以使用 logout 或 exit 关闭连接 SSH。
以下给出 Windows 终端连接 Ubuntu 样例， > 之后是在 Windows 下执行的命令。
> ping 192.168.64.128 | |
正在 Ping 192.168.64.128 具有 32 字节的数据: | |
来自 192.168.64.128 的回复: 字节=32 时间<1ms TTL=64 | |
来自 192.168.64.128 的回复: 字节=32 时间<1ms TTL=64 | |
来自 192.168.64.128 的回复: 字节=32 时间<1ms TTL=64 | |
来自 192.168.64.128 的回复: 字节=32 时间<1ms TTL=64 | |
192.168.64.128 的 Ping 统计信息: | |
数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)， | |
往返行程的估计时间(以毫秒为单位): | |
最短 = 0ms，最长 = 0ms，平均 = 0ms | |
> ssh lzy@192.168.64.128 | |
The authenticity of host '192.168.64.128 (192.168.64.128)' can't be established. | |
ED25519 key fingerprint is SHA256:kl7UUDIpwGFUkeYjH0XOFPZfrYQmG8uBNlOZWdJNcHY. | |
This key is not known by any other names | |
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes | |
Warning: Permanently added '192.168.64.128' (ED25519) to the list of known hosts. | |
lzy@192.168.64.128's password: | |
Welcome to Ubuntu 22.04.2 LTS (GNU/Linux 6.2.0-26-generic x86_64) | |
* Documentation: https://help.ubuntu.com | |
* Management: https://landscape.canonical.com | |
* Support: https://ubuntu.com/advantage | |
Expanded Security Maintenance for Applications is not enabled. | |
0 updates can be applied immediately. | |
Enable ESM Apps to receive additional future security updates. | |
See https://ubuntu.com/esm or run: sudo pro status | |
*** System restart required *** | |
The programs included with the Ubuntu system are free software; | |
the exact distribution terms for each program are described in the | |
individual files in /usr/share/doc/*/copyright. | |
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by | |
applicable law. | |
lzy@Ubuntu:~$ uname -a | |
Linux Ubuntu 6.2.0-26-generic #26~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Jul 13 16:27:29 UTC 2 x86_64 x86_64 x86_64 GNU/Linux | |
lzy@Ubuntu:~$ logout | |
Connection to 192.168.64.128 closed. |
# 关闭 SSH
使用 systemctl 关闭 SSH 服务
sudo systemctl disable ssh --now |
再次开启 SSH 服务
sudo systemctl enable ssh --now |
彻底卸载 OpenSSH
sudo apt autoremove openssh-server -y |
